学術論文誌（117件）

• Koki Miyamoto, Koji Nishibe, Takanori Shibakura, Kosuke Tamura, Jaesang Cha, Seongchul Cho, Chang-Jun Ahn, ``Analysis of Outage Probability for Massive MIMO Systems under Multi-Cell and Imperfect CSI Environments,'' IEICE Communications Express, vol.13, 2024(to be published).
• Koki Miyamoto, Koji Nishibe, Takanori Shibakura, Kosuke Tamura, Seongchul Cho, Jaesang Cha, Chang-Jun Ahn, ``Analysis of MRT precoded Massive MIMO in multi-cell environment,'' Journal of Electrical Engineering & Technology(JEET), vol.19, 2024(to be published).
• Koji Nishibe, Takanori Shibakura, Koki Miyamoto, Seongchul Cho, Jaesang Cha, Chang-Jun Ahn, ``Joint Channel and IQ Imbalance Compensation Method for MIMO-OFDM using in Coastal Railway,'' Journal of Electrical Engineering & Technology(JEET), vol.19, 2024(to be published).
• Jaesang Cha, Chang-Jun Ahn, Quoc Cuong Nguyen, Yunsik Lim, Hyejeong Cho, Seung Youn Yang, and Juphil Cho, ``A study on CFRP based lightweight House deck structure design and configuration of Deck body connected IoT sensor data acquisition devices,'' International Journal of Internet, Broadcasting and Communication, Vol.15 No.4 250-260, November 2023.
• Shun Kojima, Yuta Goto, Kazuki Maruta, Shinya Sugiura, and Chang-Jun Ahn, ``Timing Synchronization Based on Supervised Learning of Spectrogram for OFDM Systems,'' IEEE Transactions on Cognitive Communications and Networking, vol.9, no.5, pp.1141-1154, October 2023.
• He He, Jun-han Wang, Shun Kojima, Kazuki Maruta, and Chang-Jun Ahn, ``Regression CNN based Fast Fading Channel Tracking using Decision feedback channel estimation,'' RISP Journal of Signal Processing, vol.27, no.3, pp.49-57, May 2023.
• He He, Shun Kojima, Kazuki Maruta, and Chang-Jun Ahn, ``Adaptive Zero-Padding with Impulsive Training Signal MMSE-SMI Adaptive Array Interference Suppression,'' IEICE Transactions on Fundamentals, vol.E106-A, no.4, pp.674-682, April 2023.
• Hiroaki Kobayashi, Shun Kojima, Kazuki Maruta, Takatoshi Sugiyama, and Chang-Jun Ahn, ``CNN-based Blind SIR Classification Framework for STPA-BAA Spectrum Superposing,''Elsevier ICT Express, vol.9, no.1, pp.57-62, February 2023.
• He He, Jun-han Wang, Shun Kojima, Kazuki Maruta, and Chang-Jun Ahn, ``Data-Aided Weight with Subcarrier Grouping for Adaptive Array Antenna,'' Journal of Communications Software and Systems, vol.18, no.4, pp.343-349, December 2022.
• He He, Shun Kojima, Takaki Omura, Kazuki Maruta, and Chang-Jun Ahn, `` Generalized Regression Neural Network based Channel Identification and Compensation Using Scattered Pilot,'' Radioengineering, vol.30, no.4, pp.695-703, December 2021.
• Kazushi Shimada, Shun Kojima, Kazuki Maruta, and Chang-Jun Ahn, ``Adaptive Spreading Factor Assignment for VLC-OFDM-IDMA with PIC,'' IEICE Communications Express, vol.10, no.11, pp.852-857, November 2021.
• Shun Kojima, He He, Kazuki Maruta, and Chang-Jun Ahn, ``Generalized Regression Neural Network based Fast Fading Channel Tracking using Frequency-Domain CSI Smoothing,'' IEEE Access, vol.90, pp.142425-142436, October 2021.
• Shun Kojima, Kazuki Maruta, Yi Feng, Chang-Jun Ahn, and Vahid Tarokh, ``CNN based Joint SNR and Doppler Shift Classification using Spectrogram Images for Adaptive Modulation and Coding,'' IEEE Transactions on Communications, vol.69, no.8, pp.5152-5167, August 2021.
• Nobutaka Funaki, Kazuki Maruta and Chang-Jun Ahn, `Dimensionality Reduction of Interference Subspace for Multiuser Massive MIMO Null-Space Expansion,''　Elsevier Digital Signal Processing, DOI: 10.1016/j.dsp.2021.103063, 2021.
• Kakeru Matsubara, Shun Kuroki, Koki Ito, Kazushi Shimada, Kazuki Maruta, and Chang-Jun Ahn, ``Pilot De-contamination by Modified HTRCI with Time-Domain CSI Separation for Two-cell MIMO Downlink,'' IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, vol. E104-A, no.9, pp.1345-1348, September 2021.
• Naoya Tanuma, Yuta Goto, Kazuki Maruta and Chang-Jun Ahn, ``Codeword Extension for Polar Decoding and CNN-aided Adaptation,'' IEICE Communications Express, vol.10, no.8, pp. 474-479, August 2021.
• Naoya Tanuma, Yuta Goto, Kazuki Maruta and Chang-Jun Ahn, ``Known Bits Puncturing for Systematic Polar Coded OFDM Systems,'' IEICE Communications Express, vol.10, no.8, pp.486-491, August 2021.
• Koki Ito, Kakeru Matsubara, Kazushi Shimada, Kenta Goto, Kazuki Maruta, and Chang-Jun Ahn, ``Precise Analytical Model for MRT precoded Massive MIMO,'' IEICE Communications Express, vol.10, no.8 pp.451-457, August 2021.
• Kakeru Matsubara, Kenta Goto, Koki Ito, Kazushi Shimada, Kazuki Maruta, and Chang-Jun Ahn, ``Cell partitioned M-QAM for Semi-Blind Uplink Interference Suppression on Multicell Massive MIMO Systems,'' IEICE Communications Express, vol.10, no.8 pp.428-434, August 2021.
• Nobutaka Funaki, Kazuki Maruta and Chang-Jun Ahn, ``Mobility-Aware Null-Space Expansion for Multiuser Massive MIMO,'' IEICE Communications Express, vol.10, no.6, pp.324-330, June 2021.
• Kabuto Arai, Kazuki Maruta, and Chang-Jun Ahn, ``Prediction-Aided Precoding for Multiuser Massive MIMO Null-Space Expansion,'' IEICE Communications Express, vol.10, no.5 pp. 212-218, May 2021.
• Kosuke Shima, Shun Kojima, Koki Ito, Kazuki Maruta, and Chang-Jun Ahn, ``Adaptive Subcarrier Grouping for MMSE-SMI Adaptive Array Interference Suppression,'' IEEE Access, vol.9, pp.18361-18372, 2021.
• Kabuto Arai, Kazuki Maruta, and Chang-Jun Ahn, ``Uplink Null-Space Expansion for Multiuser Massive MIMO in Time- Varying Channels Under Unknown Interference,'' IEEE Access, vol.8, pp.224292 - 224305, 2021.
• Kazushi Shimada, Seiya Hirano, Mitsuki Takahashi, Kazuki Maruta and Chang-Jun Ahn, ``Channel Ranking based Spreading Factor Optimization for Multiuser Visible Light Communication OFDM-IDMA with Parallel Interference Cancellation,'' RISP Journal of Signal Processing, vol.25, no.2, pp.63-71, March 2021.
• Kazuki Maruta, and Chang-Jun Ahn, ``Multi Modulus Signal Adaptation for Semi-Blind Uplink Interference Suppression on Multicell Massive MIMO Systems,'' IEICE Transactions on Communications, vol.E104-B, no.2, pp.158-168, February 2021.
• Kosuke Shima, Kazuki Maruta, and Chang-Jun Ahn, ``Data-aided SMI Algorithm using Common Correlation Matrix for Adaptive Array Interference Suppression,'' IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, E104-A, no.2, pp.404-411, February 2021.
• Kentaro Yonei, Kazuki Maruta, and Chang-Jun Ahn, ``Frame Splitting and Data-aided Decision Direct Channel Estimation for OFDM in Fast Varying Fading Channels,'' Elsevier ICT express, vol.6, no.3, pp. 249-252, September 2020.
• Kenta Goto, Kazuki Maruta, and Chang-Jun Ahn, ``Compressed Sensing based Low Complexity 2D-DOA Estimation by Separation and Pair-Mathcing Approach,'' IEICE Communications Express, vol.9, no.6, pp.224-229, June 2020.
• Katsuya Senoo, Takashi Akao, Kazuki Maruta, Takatoshi Sugiyama, and Chang-Jun Ahn, ``Operational Range Increasement for STPA-BAA Spectrum Superposing Using Subcarrier Modulation Adaptation,'' IEICE Communications Express, vol.9, no.1, pp.13-18, January 2020.
• Koya Watanabe, Shun Kojima, Takashi Akao,Masato Katsuno, Kazuki Maruta, and Chang-Jun Ahn, ``Modified Pilot Selection for Channel Estimation of Systematic Polar Coded MIMO-OFDM,'' Elsevier ICT express, vol.5, no.4, pp.276-279, December 2019.
• Takashi Akao, Koya Watanabe, Shun Kojima, Masato Katsuno, Kazuki Maruta, and Chang-Jun Ahn, ``Reducing Channel Spatial Correlation by Rotating Planar Antenna Array,'' Elsevier ICT express, vol.5, no.4, pp.271-275, December 2019.
• Satoshi Taroda, Shoichi Higuchi, Ken Tezuka, Kazuki Maruta, and Chang-Jun Ahn, ``Transmit Power Imbalance Reduction Method and Nonlinear Companding Transform for Beamforming OFDM Systems,'' Elsevier ICT express, vol.5, no.4, pp.261-265, December 2019.
• Shun Kojima, Kazuki Maruta, and Chang-Jun Ahn, ``Adaptive Modulation and Coding using Neural Network based SNR Estimation,'' IEEE Access, vol.7, pp.183545-183553, October 2019.
• Takaki Omura, Shun Kojima, Kazuki Maruta, and Chang-Jun Ahn, ``Neural Network based Channel Identification and Compensation,'' IEICE Communications Express, vol.8, no.10, pp.415-421, October 2019.
• Kazuki Maruta, and Chang-Jun Ahn, ``Stabilized Blind Interference Suppression of Constant Modulus-based Adaptive Array over Rayleigh Fading Channels by Initial Antenna Selection,'' IET Microwaves, Antennas & Propagation, vol.13, no.11, pp.1876-1882, September 2019.
• Kazuki Maruta, and Chang-Jun Ahn, ``Improving Semi-Blind Uplink Interference Suppression on Multicell Massive MIMO Systems: A Beamspace Approach,'' IEICE Transactions on Communications, vol.E102-B, no.8, pp.1503-1511, August 2019.
• Shun Kojima, Kazuki Maruta, and Chang-Jun Ahn, ``Joint Adaptive Modulation and Transmit Power Control on Frequency Symbol Spreading OFDM Mobile Relay System,'' RISP Journal of Signal Processing, vol.23, no.3, pp.83-93, May 2019.
• Kazuki Maruta, and Chang-Jun Ahn, ``Uplink Interference Suppression by Semi-Blind Adaptive Array with Decision Feedback Channel Estimation on Multicell Massive MIMO Systems,'' IEEE Transactions on Communications, vol. 66, no. 12, pp. 6123-6134, December 2018.
• Shun Kojima, Takashi Akao, Koya Watanabe, Masato Latsuno, Kazuki Maruta, and Chang-Jun Ahn, ``Throughput Maximization by Adaptive Switching with Modulation Coding Scheme and Frequency Symbol Spreading,'' Journal of Communications Software and Systems, vol. 14, No. 4, pp. 332-339, November 2018.
• Ken Tezuka, Satoshi Taroda, Shoichi Higuchi, Kazuki Maruta, and Chang-Jun Ahn, ``Variable Channel Threshold-Based Hybrid AF-DF Cooperative Communications with Packet Splitting,'' IEIE Transactions on Smart Processing and Computing, vol. 7, No. 5, pp. 392-398, October 2018.
• Masaya Okamura, and Chang-Jun Ahn, ``Channel Compensation with Virtual Pilot Signal and Time-Frequency Interferometry for MIMO-OFDM,” IEICE Journal of Nonlinear Theory and Its Applications, vol.E-8, no.1, pp.82-94, January 2018.
• Yuta Ida, Chang-Jun Ahn, Takahiro Matsumotoy, and Shinya Matsufuji, ``Four Time Windows Averaging Channel Estimation with Real and Imaginary TFI Pilot Signals for OFDM,'' IEICE Communications Express, vol.6, no.10, pp. 590-595, October 2017.
• Shoichi Higuchi, and Chang-Jun Ahn, ``Reduced Complexity and Latency for a Massive MIMO System using a Parallel Detection Algorithm,'' Elsevier ICT express, vol.3, no.3, pp.119-123, September 2017.
• Ye Tian, and Chang-Jun Ahn, ``Performance Enhancement using Unitary Frequency Modulation with PLC and VLC Cooperation,'' International Journal of Communications, vol.11, pp.34-38, June 2017.
• Wenjian Wang, Ye Tian, and Chang-Jun Ahn, ``Blind symbol timing synchronization scheme for real-time industrial wireless control network using high-speed preambleless OFDM systems over multipath fading channels,'' Elsevier Digital Signal Processing, vol.62, pp.30-37, March 2017.
• Ye Tian, Wenjian Wang and Chang-Jun Ahn, ``Accuracy Improvement using WLAN for Indoor Positioning Systems,'' International Journal of Communications, vol.10, pp.86-90, August 2016.
• Chang-Jun Ahn, ``An Applicable 5.8 GHz Wireless Power Transmission System with Rough Beamforming to Project Loon,'' Elesevier ICT express, vol.2, no.2, pp. 87-90, July 2016.
• Willy Anugrah Cahyadi, Yong-hyeon Kim, Yeon Ho Chung, and Chang-Jun Ahn, ``Mobile Phone Camera based Indoor Visible Light Communications with Rotation Compensation,'' IEEE Photonics Journal, vol.8, no.2, pp.1-8, April 2016.
• Wenjian Wang, Ye Tian, and Chang-Jun Ahn, ``Performance Analysis of An Improved ICI-Cancellation Scheme with I/Q imbalance Compensation in TFI-OFDM Systems,'' Journal of Selected Areas in Telecommunications, vol.6, no.2, pp.1-8, February 2016.
• Wenjian Wang, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``An adaptive coarse time synchronization method for factory automation in wireless control network based on OFDM systems over fading channels,'' IEICE Communications Express, vol. 4, no.11, pp.333-339, November 2015.
• Yuta Ida, Chang-Jun Ahn, Takahiro Matsumotoy, and Shinya Matsufuji, ``Achievement Accurate CSI for AF Relay MIMO/OFDM Based on Complex HTRCI Pilot Signal with Enhanced MMSE Equalization,'' IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, vol. E98-A, no.11, pp.2254-2262, November 2015.
• Hikaru Oka, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``IQ Imbalance Estimation and Compensation Schemes based on Time Frequency Interferometry for OFDM,'' Transactions on Emerging Telecommunications Technologies（Previouly European Transactions on Telecommunications）, vol.26, no.9, pp.1165-1172, September 2015.
• Yuta Ida, Chang-Jun Ahn, Takahiro Matsumotoy, and Shinya Matsufuji, ``Estimation Based on Weighted Channel Variance for HTRCI-MIMO/OFDM with QRM-MLD and Channel Ranking under Fast Fading Channel,'' Transactions on Emerging Telecommunications Technologies（Previouly European Transactions on Telecommunications）, vol.26, no.7, pp.1050-1059, July 2015.
• Hisato Fujisaka, Takeshi Kamio, Chang-Jun Ahn, Masahiro Sakamoto, and Kazuhisa Haeiwa, ``A Sigma-Delta Domain Lowpass Wave Filter,'' IEEE Transactions on Circuits and Systems I, vol. 62, no.1, pp. 167-176, January 2015.
• Yuta Ida, Chang-Jun Ahn, Takahiro Matsumotoy, and Shinya Matsufuji, ``Removing Deep Faded Subcarrier Channel for Cooperative Multiuser Diversity OFDMA Based on Low Granularity Block,'' IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, vol. E97-A, No. 12, pp. 2586-2594, December 2014.
• Chang-Jun Ahn, Incheol Jeong, Izumi Endo, Tatsuya Omori and Ken-ya Hashimoto, ``Maritime VHF Communications with Polarization Diversity over a Rician Channel,'' Wiley International Journal of Communication Systems, vol.27, no.10, 2443-2451, October 2014.
• Taichi Sakaue, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``Time Domain Replica Signal Based Interference Compensation for SP-MIMO/OFDM with Large Delay Spread Channel,'' International Journal of Distributed Systems and Technologies (IJDST), vol.5, no.4, pp.1-17, October 2014.
• Akihiro Kuroha, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``Multiuser Diversity OFDMA using Power Priority Selection and Adaptive Clipping,'' International Journal of Distributed Systems and Technologies (IJDST), vol.5, no.4, pp.18-30, October 2014.
• Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka, and Kazuhisa Haeiwa, ``RF Energy Harvesting and Charging Circuits for Low Power Mobile Devices,'' IEIE Transactions on Smart Processing and Computing, vol. 3, no. 4, pp. 221-225, August 2014.
• Jiansong Liu, Tatsuya Omori, Chang-Jun Ahn, Ken-ya Hashimoto, ``Design and Simulation of Coupled Resonator Filters Using Periodically Slotted Electrodes on FBARs,'' IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol.61, no.5, pp.881-885, May 2014.
• Naotoshi Yoda, Chang-Jun Ahn, and Ken-ya Hashimoto, ``Single Symbol Decodable QO-STBC with Full Diversity,'' IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, vol. E97-A, no.1, pp.2-6, January 2014.
• Hisato Fujisaka, Takeshi Kamio, Chang-Jun Ahn, and Kazuhisa Haeiwa, ``Sequence Characteristics of Multi-Level and Second- Order Sigma-Delta Modulated Signals,'' IEICE Journal of Nonlinear Theory and Its Applications, vol.4, no.3, pp.347-372, July 2013.
• Shogo Soejima, Yuta Ida, Chang-Jun Ahn, Tatsuya Omori and Ken-ya Hashimoto, ''Fast Fading Compensation Based on Weighted Channel Variance for TFI-OFDM,'' RISP Journal of Signal Processing, vol.17, no.3, pp.41-49, May 2013.
• Jiansong Liu, Tatsuya Omori, Chang-Jun Ahn, Ken-ya Hashimoto, ``Impact of surface periodic grating on film bulk acoustic resonator structures to spurious transverse resonances,'' Journal of Applied Physics vo.113, no.14, April 2013.
• Yuta Ida, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``Variable Packet Splitting Transmission in Multi-Relay Cooperative Communications with DF and DAF for SC-FDMA,'' EURASIP Journal on Wireless Communications and Networking, vol.2013, DOI.10.1186/1687-1499-2013-64, March 2013.
• Hualei Wang, Jing Chen, Yu Shi, Tatsuya Omori, Chang-Jun Ahn, and Ken-ya Hashimoto, "Design of Ladder-type SAW/BAW Filters with Constant Group Delay," IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol.59, no.12, pp.2813-2817, December 2012.
• Naotoshi Yoda, Chang-Jun Ahn, and Ken-ya Hashimoto, ``Comments on ``A Novel QO-STBC Scheme with Linear Decoding for Three and Four Transmit Antennas'','' IEEE Communications Letters, vol.16, 2012.
• Chang-Jun Ahn, ``Prototype of 5.8GHz Wireless Power Transmission System for Electric Vehicle System,'' Journal of Selected Areas in Renewable and Sustainable Energy (JRSE), vol.3 no.9, pp.1-5, September 2012.
• Hisato Fujisaka, Takeshi Kamio, Chang-Jun Ahn, Masahiro Sakamoto, and Kazuhisa Haeiwa, ``Sorter-based Arithmetic Circuits for Sigma-Delta Domain Signal Processing- Part I: Addition, Approximate Transcendental Functions, and Log-domain Operations,'' IEEE Transactions on Circuits and Systems I, vol. 59, no.9, pp.1952 - 1965, September 2012.
• Hisato Fujisaka, Takeshi Kamio, Chang-Jun Ahn, Masahiro Sakamoto, and Kazuhisa Haeiwa, ``Sorter-based Arithmetic Circuits for Sigma-Delta Domain Signal Processing- Part II: Multiplication and Algebraic Functions,'' IEEE Transactions on Circuits and Systems I, vol. 59, no.9, pp. 1966 - 1979, September 2012.
• Chang-Jun Ahn, and Ken-ya Hashimoto, ``Heterogeneous constellation based QOSTBC for improving detection property of QRD-MLD,'' IEICE Transactions on Communications, vol. E95-B, no.8, pp.2674-2677, August 2012.
• Yuta Ida, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``Interference Cancellation using Replica Signal for HTRCI-MIMO/OFDM in Time-Variant Large Delay Spread Longer than Guard Interval,'' Journal of Electrical and Computer Engineering, vol. 2012, 2012 (2012), Article ID 571985, 10 pages, doi:10.1155/2012/571985.
• Chang-Jun Ahn, Dongsu Har, Tatsuya Omori, and Ken-ya Hashimoto, ``Resource Allocation of Adaptive Subcarrier Block with Frequency Symbol Spreading for OFDMA,'' Elsevier Digital Signal Processing, vol.22, no.3, pp.518-525, May 2012.
• Yuta Ida, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``Complexity Reducing of Subcarrier Selection Method based on Low Granularity Block for TFI-MUDiv/OFDMA,'' Recent Patents on Signal Processing, vol.2, no.1, pp.68-75, April 2012.
• Jing Chen, Jiansong Liu, Ken-ya Hashimoto, Tatsuya Omori, Chang-Jun Ahn, Xiangyong Zhao, and Haosu Luo, "Ultra-Wideband Surface Acoustic Wave Resonator Employing Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 Crystals," Applied Physics Letters , vol.100, no.2, 022903:1-3, January 2012.
• Keisuke Nagata, Hisato Fujisaka, Takeshi Kamio, Chang-Jun Ahn, and Kazuhisa Haeiwa `` An Analysis of Delay-Locked Loop Tracking Binary Markovian Sequence in the Presence of Multiple Access Interference and Channel Noise,'' IEICE Journal of Nonlinear Theory and Its Applications, vol.2, no.4, pp. 373-385, November 2011.
• Hyunju Kim, Eonpyo Hong, Chang-Jun Ahn, and Dongsu Har, ``Efficient phase sequence generation for SLM scheme without side information,'' IEICE Electronics Express, vol. 8, no.17, pp.1393-1398, September 2011.
• Hyunju Kim, Eonpyo Hong, Chang-Jun Ahn, and Dongsu Har, ``A pilot symbol pattern enabling data recovery without side information in PTS-based OFDM systems,'' IEEE Transactions on Broadcasting, vol. 57, no.2, pp.307-312, June 2011.
• Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, `` Influence of Laser Linewidth and Modulation Level for Coherent Optical OFDM with Punctured LDPC Codes,'' WSEAS Transactions on Communications, vol.10, no.6, pp.175-181, June 2011.
• Yuta Ida, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``Throughput Performance Enhancement for MUDiv/OFDMA using MMSE Equalization without Guard Interval,'' Journal of Selected Areas in Telecommunications, vol.2, no.5, pp.74-80, May, 2011.
• Jing Chen, Hualei Wang, Ken-ya Hashimoto, Tatsuya Omori, Chang-Jun Ahn, Xiangyong Zhao, and Haosu Luo, "Theoretical Analysis of Ultrahigh Electromechanical Coupling Surface Acoustic Wave Propagation in PIN-PMN-PT Crystals," Journal of Applied Physics, vol.109, no.5, 054104:1-3, March 2011.
• Kazuhisa Haeiwa, Yoshikazu Toba, Takeshi Kamio, Hisato Fujisaka, and Chang-Jun Ahn `` Considerations of Lumped Constant Type LN Optical Modulator operating at 10GHz Band,'' IEICE Transactions on Electronics, vol. J94-C, no.1, pp.18-26, January 2011.
• Chang-Jun Ahn, ``HTRCI and Channel Ranking based Joint Symbols Detection for MQRD-PCM/MIMO-OFDM,'' Wireless Personal Communications, vol.55, no.4, pp.485-499, December 2010.
• Keisuke Nagata, Hisato Fujisaka, Takeshi Kamio, Chang-Jun Ahn, and Kazuhisa Haeiwa `` Steady-state analysis of delay-locked loops tracking binary Markovian sequences,'' IEICE Journal of Nonlinear Theory and Its Applications, vol.1, no.1, pp.153-165, October 2010.
• Chang-Jun Ahn, ``Achievable Throughput Enhancement Based on Modified Carrier Interferometry for MIMO/OFDM,'' Elsevier Digital Signal Processing, vol.20, no.5, pp.1447-1457, September 2010.
• Kazuhisa Haeiwa, Takeshi Kamio, Hisato Fujisaka, Chang-Jun Ahn, and Yoshikazu Toba, `` Considerations of Optimum Electrode Structure for High Frequency and High Sensitivity in the Microwave Band (Part 2),'' Hohsoh Gijutsu, vol. 63, no.1, pp.115-120, January 2010 (in Japanese).
• Kazuhisa Haeiwa, Takeshi Kamio, Hisato Fujisaka, Chang-Jun Ahn, and Yoshikazu Toba, `` Considerations of Optimum Electrode Structure for High Frequency and High Sensitivity in the Microwave Band (Part 1),'' Hohsoh Gijutsu, vol. 62, no.12, pp.99-105, December 2009 (in Japanese).
• Chang-Jun Ahn, ``Performance Enhancement of MQRD-PCM/MIMO-OFDM using Channel Ranking based Joint Symbols Detection,'' IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, vol. E92-A, no.8, pp.1913-1919, August 2009.
• Takeshi Yoshimura, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``Performance Enhancement of TFI-OFDM with Path Selection based Channel Identification,'' Elsevier Digital Signal Processing, vol.19, no.5, pp.852-860, 2009.
• Masanori Yofune, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``Decision Direct and Linear Prediction based Fast Fading Compensation for TFI-OFDM,'' Far East Journal of Electronics and Communications, vol.3, no.1, pp.35-52, April 2009.
• Yuta Ida, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``An Interference Cancellation Scheme for TFI-OFDM in Time-Variant Large Delay Spread Channel,'' Radioengineering, vol. 18, no.1, pp.75-82, April 2009.
• Chang-Jun Ahn, ``Link Correlation based Transmit Sector Antenna Selection for Alamouti Coded OFDM,'' IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, vol. E92-A, no.3, pp.816-823, March 2009.
• Kazuhisa Haeiwa, Takeshi Kamio, Hisato Fujisaka, Chang-Jun Ahn, and Yoshikazu Toba, `` Considerations of Electrode Structure for an LN Optical Modulator in the Microwave Band,'' IEICE Transactions on Electronics, vol. J92-C, no.1, pp.1-10, January 2009 (in Japanese).
• Chang-Jun Ahn, ``Throughput Improvement with Discrete Pilot Signal Assignment and Iterative Channel Identification for MQRD-PCM/OFDM,'' IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, vol. E91-A, no.8, pp.2000-2007, August 2008.
• Chang-Jun Ahn, Satoshi Takahashi, Hisato Fujisaka, Takeshi Kamio, and Kazuhisa Haeiwa, `` Power Consumption for Coherent Optical Orthogonal Frequency Division Multiplexing with Punctured LDPC Codes and Variable Amplitude Block Codes,'' IEEE/OSA Journal of Lightwave Technology, vol.26, no.14, pp.2227-2234, July 2008.
• Chang-Jun Ahn, ``Parallel Detection Algorithm Using Multiple QR Decompositions with Permuted Channel Matrix for SDM/OFDM,'' IEEE Transactions on Vehicular Technology, vol.57, no.4, pp.2578-2582, July 2008.
• Takeshi Kamio, Kunihiko Mitsubori, Chang-Jun Ahn, Hisato Fujisaka, and Kazuhisa Haeiwa,``Fuzzy ARTMAP with Explicit and Implicit Weights,'' Springer Lecture Notes in Computer Science, vol.4984, pp.299-308, June 2008.
• Chang-Jun Ahn, ``Transmit Sector Selection with Considering the Link Correlation for SDM/OFDM Systems,'' IET Microwaves, Antennas and Propagation, vol.1, no.6, pp.1145-1151, December 2007.
• Chang-Jun Ahn, ``Accurate Channel Identification with Time-Frequency Interferometry for OFDM,'' IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, vol. E90-A, no.11, pp.2641-2645, November 2007.
• Chang-Jun Ahn, ``Unitary Matrix Modulation with Splitting Over the Coherence Bandwidth for OFDM in a Single Antenna System,'' Wiley Wireless Communications and Mobile Computing, vol.6, no.8, pp.1037-1045, December,2006.
• Nam-Su Kim, Sungho Cho, and Chang-Jun Ahn, ``Subcarrier Block Power Control for Adaptive Downlink OFDM with Frequency Spreading and Equalization,'' IEICE Transactions on Communications, vol. E89-B, no.7, pp.2102-2105, July, 2006.
• Chang-Jun Ahn, and Satoshi Takahashi, ``Performance Evaluation of an OFDM using Unitary Matrix Frequency Modulation for Power Line Communications over Impulsive Noise Channels,'' WSEAS Transactions on Communications, vol.5, no.3, pp.454-459, March, 2006.
• Chang-Jun Ahn, Hiroshi Harada, and Yukiyoshi Kamio, ``Superimposed Frequency Symbol Based Adaptive Downlink OFDM with Frequency Spreading and Equalization,'' IEICE Transactions on Communications, vol. E89-B, no. 2, pp.500-508, Feb., 2006.
• Satoshi Takahashi, Chang-Jun Ahn, and Hiroshi Harada , ``Stochastic method of determining substream modulation levels for MIMO eigenbeam space division multiplexing,'' IEICE Transactions on Communications, vol. E89-B, no.1, pp.142-149, January, 2006.
• Chang-Jun Ahn, Satoshi Takahashi, Hiroshi Harada, Yukioshi Kamio, and Iwao Sasase, ``Adaptive Subcarrier Block Modulation with Differentially Modulated Pilot Symbol Assistance for Downlink OFDM Using Uplink Delay Spread,'' IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, vol. E88-A, no.7, pp.1889-1896, July, 2005.
• Satoshi Takahashi, Chang-Jun Ahn, Hiroshi Harada, and Yukioshi Kamio, ``Effect of Delay Spread Enhancement in MIMO Eigenbeam Space Division Multiplexing Transmission,'' IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, vol. E88-A, no.7, pp.1931-1935, July, 2005.
• Chang-Jun Ahn, Satoshi Takahashi, and Hiroshi Harada, ``Differential Modulated Pilot Symbol Assisted Adaptive OFDM for Reducing the MLI,'' IEICE Transactions on Communications, vol. E88-B, no.2, pp.436-442, Feb., 2005.
• Chang-Jun Ahn, Yukiyoshi Kamio, Satoshi Takahashi, and Hiroshi Harada , ``Reverse Link Performance Improvement for an Wideband OFDM Using Alamouti Coded Heterogeneous Polarization Antennas,'' IEICE Transactions on Communications, vol. E87-B, no.11, pp.3281-3288, November, 2004.
• Chang-Jun Ahn, ``Enhancement of MLD for SDM/OFDM using Power Imbalance of Polarization and Pre-phase Distortion Scheme,'' IEE Electronics Letters, vol. 40, no. 19, pp.1199-1200, Sept., 2004.
• Chang-Jun Ahn, ``Iterative decoding with LDPC based unitary matrix modulation with splitting over the coherence bandwidth for OFDM,'' IEICE Transactions on Communications, vol. E87-B, no.8, pp.2411-2414, August, 2004.
• Naoki Yoshimochi, Tomohiro Hiramoto, Atsushi Mizuki, Chang-Jun Ahn, and Iwao Sasase, ``LDPC coded unitary space-time modulated OFDM in broadband mobile channel,'' IEE Electronics Letters, vol.39, no.13, pp.994-995, June, 2003.
• Chang-Jun Ahn, and Iwao Sasase, ``Convolutional coded coherent and differential unitary space-time modulated OFDM with bit interleaving for multiple antennas systems,'' WSEAS Transactions on Communications, vol.2, no.1, pp.58-63,Sept., 2003.
• Chang-Jun Ahn, and Iwao Sasase, ``Pilot symbol assisted high speed packet transmission system based on adaptive OFDM in broadband mobile channel,'' KICS Journal of Communications and Networks, vol.5, no.1, pp.25-32, March, 2003.
• Chang-Jun Ahn, and Iwao Sasase, ``Multiple pre-Rake filtering based on the predicted channel impulse response in the transmitter and a Rake combiner in the receiver for TDD/DS-CDMA mobile communication systems,'' IEICE Transactions on Communications, vol. E85-B, no.10, pp.2282-2291, Oct., 2002.
• Chang-Jun Ahn, and Iwao Sasase, ``Adaptive array antenna based on radial basis function network as a multi-user detection for WCDMA systems,'' IEE Electronics Letters, vol.38, no.20, pp.1208-1210, Sept., 2002.
• Chang-Jun Ahn, and Iwao Sasase, ``Code orthogonalizing filter based adaptive array antenna using common correlation matrix of time domain signals for multicarrier DS/CDMA,'' IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, vol.E85-A, no.7, pp.1604-1611, July, 2002.
• Chang-Jun Ahn, and Iwao Sasase, ``The effects of modulation combination, target BER, Doppler frequency, and adaptive interval on the performance of adaptive OFDM in broadband mobile,'' IEEE Transactions on Consumer Electronics, vol.48, no.1, pp.167-174, Feb., 2002.

国際会議（155件）

• Jun-han Wang, He He, Kosuke Tamura, Shun Kojima, Jaesang Cha, and Chang-Jun Ahn, ``Vehicle-To-Vehicle Communication Channel Estimator Based on Gate Recurrent Unit,'' IEEE International Conference on Electronics, Information, and Communication (ICEIC2024), Taipei, Taiwan, January 2024(to be presented).
• Koji Nishibe, Takanori Shibakura, Koki Miyamoto, Jaesang Cha, and Chang-Jun Ahn, ``Efficient Joint Estimation Methods of Channel and IQ Imbalance for MIMO-OFDM Systems,'' IEEE International Conference on Electronics, Information, and Communication (ICEIC2024), Taipei, Taiwan, January 2024(to be presented).
• Kosuke Tamura, Shun Kojima, Kazuki Komatsu, Jaesang Cha, and Chang-Jun Ahn, ``Spectrally Efficient Frequency Division Multiplexing with QRM-MLD for Rician Fading Channel,'' Proc. of IEEE International Conference on Advanced Technologies for Communications (ATC2023), pp.128-133, October 2023.
• Hiroki Ueno, Kosuke Tamura, Hiroki Nakano, Riku Takemoto, Kazuki Maruta, Jaesang Cha, and Chang-Jun Ahn, ``Adaptive Modulation and Coding for Uplink Massive MIMO with Semi-Blind Interference Suppression Under Multicell Environment,'' Proc. of IEEE International Conference on Advanced Technologies for Communications (ATC2023), pp.134-139, October 2023.
• Riku Takemoto, Kosuke Tamura, Hiroki Ueno, Hiroki Nakano, He He, Jaesang Cha, and Chang-Jun Ahn, ``Low-Computation DOA Estimation Using Virtual Antenna in 2D MIMO Systems,'' Proc. of IEEE International Conference on Advanced Technologies for Communications (ATC2023), pp.196-201, October 2023.
• Hiroki Nakano, Kosuke Tamura, Hiroki Ueno, Riku Takemoto, Jaesang Cha, and Chang-Jun Ahn, ``Each Layer Adaptation for Throughput Enhancement of LACO-OFDM,'' Proc. of IEEE International Conference on Advanced Technologies for Communications (ATC2023), pp.202-206, October 2023.
• Woo-Young Kim, Hyung-Kon Lee, Youngmin Kim, Seungyoun Yang, Jintae Kim, Kyung-Wan Koo, Minsoo Kim, Seong-Kweon Kim, Chang-Jun Ahn, and Jaesang Cha, ``A rectangular gate structure with attachable sanitary lights and human monitoring camera,'' Proc. of International Conference on Electrical Facilities and information technologies 2023, Kazakhstan, August 2023.
• Woo-Young Kim, Hyung-Kon Lee, Gyewon Choi, Minsoo Kim, Seong-Kweon Kim, Kyung-Wan Koo, Chang-Jun Ahn, and Jaesang Cha, ``A development of IoT switching and control box application used in various power source choice and sanitary light control functions,'' Proc. of International Conference on Electrical Facilities and information technologies 2023, Kazakhstan, August 2023.
• He He, Shun Kojima, Kazuki Maruta, and Chang-Jun Ahn, ``Data-aided weight with subcarrier grouping for Adaptive Array Interference Suppression,'' Proc. of International Conference On Consumer Electronics-Asia (ICCE-Asia2022), October 2022.
• Koji Nishibe, Takanori Shibakura, Koki Miyamoto and Chang-Jun Ahn, ``Novel IQ Imbalance Compensation Method for MIMO-OFDM Systems,'' Proc. of International Conference On Consumer Electronics-Asia (ICCE-Asia2022), October 2022.
• Koki Miyamoto, Koji Nishibe, Takanori Shibakura and Chang-Jun Ahn, ``Outage Probability of Downlink Massive MIMO with MRT Precoding under Multicell Environment,'' Proc. of International Conference On Consumer Electronics-Asia (ICCE-Asia2022), October 2022.
• Takanori Shibakura, Koji Nishibe, Koki Miyamoto and Chang-Jun Ahn, ``ASB-AM/OFDMA with FSS and TPC for Reducing Packet Overhead,'' Proc. of International Conference On Consumer Electronics-Asia (ICCE-Asia2022), October 2022.
• Koki Yamashita, Taiga Mano, Tensho Nagasato and Chang-Jun Ahn, ``Adaptive Resource Assignment for Multi-user VLC based on Pre-Distorted ADO-OFDM,'' Proc. of International Conference On Consumer Electronics-Asia (ICCE-Asia2022), October 2022.
• Taiga Mano, Koki Yamashita, Tensho Nagasato and Chang-Jun Ahn, ``Sum-Product Decoding based Simple Hamming Code for Low Power Mobile Devices,'' Proc. of International Conference On Consumer Electronics-Asia (ICCE-Asia2022), October 2022.
• Tensho Nagasato, Koki Yamashita, Taiga Mano and Chang-Jun Ahn, ``Utilization of Half-wave Symmetry of Signals and Data Selection in VLC-OFDM,'' Proc. of International Conference On Consumer Electronics-Asia (ICCE-Asia2022), October 2022.
• Shun Kojima, Yi Feng, Kazuki Maruta, Chang-Jun Ahn, and Vahid Tarokh, ``Towards Deep Learning-Guided Multiuser SNR and Doppler Shift Detection for Next-Generation Wireless Systems,'' Proc. of IEEE Vehicular Technology Conference (VTC2022), June 2022.
• Sudhanshu Arya, Yeonho Chung, and Chang-Jun Ahn, ``Game Theoretic Framework for Beamforming Optimization for Photon-Counting Multiuser MISO Channel with Asymptotic Low Power,'' Proc. of IEEE International Conference on Communications (ICC2022), pp.481-486, May 2022.
• Yasuyuki Ninomiya, and Chang-Jun Ahn, ``Adaptive Frequency Symbol Spreading With Considering Link Correlation Under Rician Fading Environment,'' Proc. of IEEE International Conference on Electrical, Electronics and Computer Engineering (DELCON2022), pp.1-4, DOI: 10.1109/DELCON54057.2022.9753536, February 2022.
• Koki Yanashita, Kazushi Shimada, Seiya Hirano, and Chang-Jun Ahn, ``Optimum Assignment of Variable Code Length and Modulation Index for VLC-OFDM,'' Proc. of IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS2021), pp.1-2, DOI: 10.1109/ISPACS51563.2021.9651065, Noverber 2021.
• Yuta Toyama, Shun Kojima and Chang-Jun Ahn, ``Performance Enhancement of Low Granularity MIMO-OFDMA Using FSS Method,'' Proc. of IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS2021), pp.1-2, DOI: 10.1109/ISPACS51563.2021.9651133, Noverber 2021.
• Taiga Mano and Chang-Jun Ahn, ``Joint Polar Code and Trellis Coded Modulation with Known Bits Puncturing,'' Proc. of IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS2021), pp.1-2, DOI: 10.1109/ISPACS51563.2021.9651033, Noverber 2021.
• Shun Kojima, Kazuki Maruta, Yi Feng, Chang-Jun Ahn, and Vahid Tarokh, ``Investigation of Input Signal Representation to CNN for Improving SNR Classification Accuracy,'' Proc. of IEEE VTC2021, pp.1-5, DOI: 10.1109/VTC2021-FALL52928.2021.9625566, 2021.
• Shun Kojima, Kosuke Shima, Kazuki Maruta, Takatoshi Sugiyama and Chang-Jun Ahn, ``K-Factor Estimation based on Spectrogram Images by Convolutional Neural Network,'' Proc. of International Conference on Emerging Technologies for Communications (ICETC2020), December 2020.
• Youto Namie, Shun Kojima, Kazuki Maruta and Chang-Jun Ahn, ``Convolutional Neural Network aided SNR Estimation Using IQ Constellation Images,'' Proc. of International Conference on Emerging Technologies for Communications (ICETC2020), December 2020.
• Naoya Tanuma, Yuta Goto, Kakeru Matsubara, Kazuki Maruta and Chang-Jun Ahn, ``Performance Improvement of Polar Codes with Successive Cancellation Decoding by Extended Block Length,'' Proc. of International Conference on Emerging Technologies for Communications (ICETC2020), December 2020.
• Kazuki Mukai, Kazuki Maruta and Chang-Jun Ahn, ``Improving Low Complexity Inter-User Interference Cancellation for Massive MIMO Systems,'' Proc. of International Conference on Emerging Technologies for Communications (ICETC2020), December 2020.
• Yuta Goto, Shun Kojima, Kazuki Maruta and Chang-Jun Ahn, ``A Preamble-less Symbol Timing Synchronization for OFDM Systems Using Convolutional Neural Networks,'' Proc. of International Conference on Emerging Technologies for Communications (ICETC2020), December 2020.
• Kakeru Matsubara, Yuta Goto, Naoya Tanuma, Koki Ito,Kazuki Maruta and Chang-Jun Ahn, ``Application of Higher-order Modulation for Semi-blind Interference Suppression on Multi-cell Massive MIMO Uplink,'' Proc. of International Conference on Emerging Technologies for Communications (ICETC2020), December 2020.
• Koki Ito, Kakeru Matsubara, Kosuke Shima, Yuta Goto, Kazuki Maruta and Chang-Jun Ahn, ``Precise Analytical Model of MRT Precoded Massive MIMO Downlink,'' Proc. of International Conference on Emerging Technologies for Communications (ICETC2020), December 2020.
• He He, Shun Kojima, Kazuki Maruta, and Chang-Jun Ahn, ``GRNN based Channel Estimation using Scattered Pilot and RBF Interpolation,'' Proc. of International Conference on Emerging Technologies for Communications (ICETC2020), December 2020.
• Hiroaki Kobayashi, Kazuki Maruta, Takatoshi Sugiyama and Chang-Jun Ahn, ``Computationally Efficient SLM based PAPR Reduction for STPA-BAA Scheme,'' Proc. of International Symposium on Wireless Personal Multimedia Communications (WPMC2020), October 2020.
• Kabuto Arai, Kazuki Maruta and Chang-Jun Ahn, ``High Beamforming Gain Precoding Weight Design Scheme with Null-Space Expansion for Multiuser Massive MIMO in Time-Varying Channels,'' Proc. of International Symposium on Wireless Personal Multimedia Communications (WPMC2020), October 2020.
• Toshiya Hanada, Kazuki Maruta and Chang-Jun Ahn, ``Improving DOA Estimation Accuracy by Rotating Planar Array Antenna,'' International Symposium on Wireless Personal Multimedia Communications (WPMC2020), October 2020.
• Nobutaka Funaki, Kazuki Maruta and Chang-Jun Ahn, ``Improved Null-Space Expansion Scheme under Presence of Channel Estimation Error for Multiuser Massive MIMO,'' Proc. of International Symposium on Wireless Personal Multimedia Communications (WPMC2020), October 2020.
• Seiya Hirano, Kazushi Shimada,Shun Kojima, Kazuki Maruta and Chang-Jun Ahn, ``Reducing FBI and MLI Using FSS Method for Adaptive Modulated VLC-OFDM System,'' Proc. of International Symposium on Wireless Personal Multimedia Communications (WPMC2020), pOctober 2020.
• Shun Kojima, Kazuki Maruta and Chang-Jun Ahn, ``High-precision SNR Estimation by CNN using PSD Image for Adaptive Modulation and Coding,'' Proc. of IEEE Vehicular Technology Conference: VTC2020-Spring, pp.1-6, Antwerp, Belgium, May 2020.
• Koki Ito, Kazuki Maruta, and Chang-Jun Ahn, ``Outage Probability Analysis of MF Precoded Massive MIMO with Multi-antenna User Environment,'' Proc. of IEEE Asia-Pacific Conference on Communications (APCC2019), pp.50-54, Hochimin, Vietnam, November 2019.
• Kosuke Shima, Katsuya Senoo, Kenta Goto, Kazuki Maruta, and Chang-Jun Ahn, ``Data-aided SMI Algorithm using Common Correlation Matrix for Adaptive Array Interference Suppression,'' Proc. of IEEE Asia-Pacific Conference on Communications (APCC2019), pp.398-402, Hochimin, Vietnam, November 2019.
• Kakeru Matsubara, Shun Kuroki, Kazuki Maruta, and Chang-Jun Ahn, ``Modified HTRCI with Time-domain CSI Separation for Pilot De-contamination,'' Proc. of IEEE Asia-Pacific Conference on Communications (APCC2019), pp.226-231, Hochimin, Vietnam, November 2019.
• Kouichi Motosugi, Kentaro Yonei, Kazuki Maruta, and Chang-Jun Ahn, ``Fast Fading Compensation by Frame Spliting and Decision Directed Channel Extrapolation for OFDM,'' Proc. of IEEE Asia-Pacific Conference on Communications (APCC2019), pp.131-135, Hochimin, Vietnam, November 2019.
• Kazushi Shimada, Mitsuki Takahashi, Kazuki Maruta, and Chang-Jun Ahn, ``Channel Ranking based Spread Code Optimization for Visible Light Communication OFDM-IDMA Systems'' Proc. of IEEE Asia-Pacific Conference on Communications (APCC2019), pp.185-189, Hochimin, Vietnam, November 2019.
• Naoya Tanuma, Ryo Marumo, Kazuki Maruta, and Chang-Jun Ahn, ``Known Bits Puncturing for Systematic Polar Codes,'' Proc. of IEEE Asia-Pacific Conference on Communications (APCC2019), pp.511-515, Hochimin, Vietnam, November 2019.
• Shun Kuroki, Kakeru Matsubar, Kazuki Maruta, and Chang-Jun Ahn, ``Modified HTRCI with Variable Pulse Generation for Pilot De-contamination,'' Proc. of IEEE International Conference on Advanced Technologies for Communications (ATC2019), pp.23-27, Hanoi, Vietnam, October 2019.
• Takaki Omura, Nythanel Hoeur, Kazuki Maruta, and Chang-Jun Ahn, ``Improving ANN based Channel Identification and Compensation using GRNN Method under Fast Fading Environment,'' Proc. of IEEE International Conference on Advanced Technologies for Communications (ATC2019), pp.28-32, Hanoi, Vietnam, October 2019.
• Mitsuki Takahashi, Kazushi Shimada, Kazuki Maruta, and Chang-Jun Ahn, ``Throughput Improvement Using Code Length Optimization for VLC-OFDM/IDMA,'' Proc. of IEEE International Conference on Advanced Technologies for Communications (ATC2019), pp.33-37, Hanoi, Vietnam, October 2019.
• Ryo Marumo, Naoya Tanuma, Kazuki Maruta, and Chang-Jun Ahn, ``Throughput Improvement of Systematic Polar Coded MIMO-OFDM by Puncturing,'' Proc. of IEEE International Conference on Advanced Technologies for Communications (ATC2019), pp.63-67, Hanoi, Vietnam, October 2019.
• Kazuki Maruta, and Chang-Jun Ahn, ``Enhanced Semi-Blind Uplink Interference Suppression on Multicell Massive MIMO Systems for Multi Modulus Signals,'' Proc. of IEEE 90th Vehicular Technology Conference (VTC-Fall2019), pp.1-6, Honolulu, Hawaii, USA, September 2019.
• Takashi Akao, Koya Watanabe, Shun Kojima, Masato Katsuno, Kazuki Maruta, and Chang-Jun Ahn, ``Reducing Channel Spatial Correlation by Rotating Planar Antenna Array,'' Proc. of IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS 2018), pp.1-4, Ishigaki Island, Okinawa, Japan, November 2018.
• Koya Watanabe, Shun Kojima, Takashi Akao, Masato Katsuno, Kazuki Maruta, and Chang-Jun Ahn, ``Modified Pilot Selection for Systematic Polar Coded MIMO-OFDM Channel Estimation,'' Proc. of IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS 2018), pp.1-5,Ishigaki Island, Okinawa, Japan, November 2018.
• Kazuki Maruta, Kentaro Nishimori, and Chang-Jun Ahn, ``Constant Modulus and Kurtosis based Blind Adaptive Array Interference Suppression: Comparisons and New Approach,'' Proc. of IEEE International Symposium on Communications and Information Technologies (ISCIT 2018), pp.43-47, Bangkok, Thailand, September 2018.
• Takaki Omura, Shun Kojima, Kazuki Maruta, and Chang-Jun Ahn, ``Neural Network based Channel Identification and Compensation,'' Proc. of IEEE International Symposium on Communications and Information Technologies (ISCIT 2018), pp.349-354, Bangkok, Thailand, September 2018.
• Katsuya Senoo, Takashi Akao, Kazuki Maruta, and Chang-Jun Ahn, ``Improvement and Expansion of Operational Range for STPA-BAA Spectrum Superposing Scheme Using Subcarrier Adaptive Modulation,'' Proc. of IEEE International Symposium on Communications and Information Technologies (ISCIT 2018), pp.333-338, Bangkok, Thailand, September 2018.
• Kentaro Yonei, Koya Watanabe, Kazuki Maruta, and Chang-Jun Ahn, ``Iterative Channel Estimation with Polar Codes for Short Block Transmission,'' Proc. of IEEE International Symposium on Communications and Information Technologies (ISCIT 2018), pp.38-42, Bangkok, Thailand, September 2018.
• Kenta Goto, Takashi Akao, Kazuki Maruta, and Chang-Jun Ahn, ``Reduced Complexity Direction-of-Arrival Estimation for 2D Planar Massive Arrays:A Separation Approach,'' Proc. of IEEE International Symposium on Communications and Information Technologies (ISCIT 2018), pp.48-53, Bangkok, Thailand, September 2018.
• Shun Kojima, Takashi Akao, Koya Watanabe, Masato Latsuno, Kazuki Maruta, and Chang-Jun Ahn, ``Adaptive Switching Method with AMC and FSS,'' Proc. of IEEE International Conference on Software, Telecommunications and Computer Networks (SoftCOM 2018), pp.1-6, Split, Croatia, September 2018.
• Kazuki Maruta, Yu Nakayama, Kasuaki Honda, Daisuke Hisano, and Chang-Jun Ahn, ``V2P Connectivity on Higher Frequency Band and CoMP Based Coverage Expansion,'' Proc. of IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE PIMRC 2018), pp.568-569, Bologna, Italy, September 2018.
• Satoshi Taroda, Kazuki Maruta, and Chang-Jun Ahn, ``Transmit Power Imbalance Reduction Method and Nonlinear Companding Transform for Beamforming OFDM Systems,'' Proc. of IEEE International Conference on Communications and Electronics (ICCE2018), pp.127-130, Hue, Vietnam, July 2018.
• Shoichi Higuchi, Kazuki Maruta, and Chang-Jun Ahn, ``Efficient Channel Column Sorting Method Based on Householder Transformation for QRM-MLD,'' Proc. of IEEE International Conference on Communications and Electronics (ICCE2018), pp.151-154, Hue, Vietnam, July 2018.
• Ken Tezuka, Kazuki Maruta, and Chang-Jun Ahn, ``Variable Channel Threshold-Based Hybrid AF-DF Cooperative Communications with Packet Splitting,'' Proc. of IEEE International Conference on Consumer Electronics - Asia (ICCE-Asia2018), pp.144-147, Jeju, Korea, June 2018.
• Chang-Jun Ahn, and Ken-ya Hashimoto, ``5G - Performance Challenges,'' Proc. of International Symposium on Acoustic Wave Devices for Future Mobile Communication Systems2018, pp.1, Chiba, Japan, March 2018.
• Shun Kojima, Ken Teduka, Kazuki Maruta, and Chang-Jun Ahn, ``Optimized Adaptive Modulation with Considering Mobile Relay on FSS-OFDM System,” Proc. of International Symposium on Wireless Personal Multimedia Communications (WPMC2017), pp.41-45, Yogyakarta, Indonesia, Dec. 2017.
• Koya Watanabe, Shoichi Higuchi, Kazuki Maruta, and Chang-Jun Ahn, ``Performance of Polar Codes with MIMO-OFDM Under Frequency Selective Fading Channel,” Proc. of International Symposium on Wireless Personal Multimedia Communications (WPMC2017), pp.107-111, Yogyakarta, Indonesia, Dec. 2017.
• Ye Tian, Daito Shigaki, Wenjian Wang, and Chang-Jun Ahn, ``A Weighted Least-Squares Method Using Received Signal Strength Measurements for WLAN Indoor Positioning System,” Proc. of International Symposium on Wireless Personal Multimedia Communications (WPMC2017), pp.310-314, Yogyakarta, Indonesia, Dec. 2017.
• Masato Katsuno, Shoichi Higuchi, Kazuki Maruta, and Chang-Jun Ahn, ``Improving Scattered Pilot Channel Estimation by Sector Selection on FDD MIMO/OFDM Systems,” Proc. of International Symposium on Wireless Personal Multimedia Communications (WPMC2017), pp.22-27, Yogyakarta, Indonesia, Dec. 2017.
• Takashi Akao, Satoshi Taroda, Kazuki Maruta, and Chang-Jun Ahn, ``Improved Common Correlation Matrix Based SMI Algorithm by Channel Estimation Error Minimization with LMS Approach,” Proc. of International Symposium on Wireless Personal Multimedia Communications (WPMC2017), pp.63-67, Yogyakarta, Indonesia, Dec. 2017.
• Asato Kurihara, and Chang-Jun Ahn, ``Uplink Multiuser VLC-OFDM-IDMA System with Successive Interference Cancellation,”Proc. of IEICE International Symposium on Nonlinear Theory and Its Applications (NOLTA2017), pp.1-5, Cancun, Mexico, Dec. 2017.
• Masayoshi Fujishiro, Kazuki Maruta, and Chang-Jun Ahn, ``Preamble-less Synchronization by Short Block Autocorrelation for OFDM Systems over Multipath Fading Channels,”Proc. of IEICE International Symposium on Nonlinear Theory and Its Applications (NOLTA2017), pp.1-5, Cancun, Mexico, Dec. 2017.
• Kazuki Maruta, Chang-Jun Ahn, and Kenya Hashimoto, ``Stabilized Interference Suppression by Initial Antenna Selection for CMA Adaptive Array over Rayleigh Fading Channels,”Proc. of IEICE International Symposium on Nonlinear Theory and Its Applications (NOLTA2017), pp.1-5, Cancun, Mexico, Dec. 2017.
• Kenya Hashimoto, Tatsuya Omori, Kazuki Maruta, and Chang-Jun Ahn, ``Nonlinearity in RF Front-End as a Bottleneck in High Speed Mobile Communications,”Proc. of IEICE International Symposium on Nonlinear Theory and Its Applications (NOLTA2017), pp.1-5, Cancun, Mexico, Dec. 2017.
• Shoichi Higuchi, Chang-Jun Ahn, and Ken-ya Hashimoto, ``A Reduced Complexity and Latency of Massive MIMO using Parallel Detection Algorithm,'' Proc. of IEEE International Technical Conference of Region 10 (TENCON2016), pp.1998-2001, Marina Bay Sands, Singapore, November 2016.
• Ken Tezuka, Chang-Jun Ahn, and Ken-ya Hashimoto, ``AF Cooperative Communications with Expansion of Channel Matrix and QRM-MLD for MU-MIMO,'' Proc. of IEEE International Technical Conference of Region 10 (TENCON2016), pp.1990-1993, Marina Bay Sands, Singapore, November 2016.
• Satoshi Taroda, Chang-Jun Ahn, and Ken-ya Hashimoto, ``Signal Separation Method with Polarization Antennas for Downlink MU-MIMO Systems,'' Proc. of IEEE International Technical Conference of Region 10 (TENCON2016), pp.1994-1997, Marina Bay Sands, Singapore, November 2016.
• Ye Tian, Takumi Saito, Wenjian Wang, and Chang-Jun Ahn, ``Optimal Channel Ranking Using Multiple Channel Permutation for QRM-MLD,'' Proc. of IEEE International Technical Conference of Region 10 (TENCON2016), pp.2178-2181, Marina Bay Sands, Singapore, November 2016.
• Masaya Okamura, Chang-Jun Ahn, and Ken-ya Hashimoto, ``Novel Channel Estimation and Compensation for massive MIMO-OFDM,'' Proc.of International Symposium on Nonlinear Theory and Its Applications ( NOLTA2016), pp.95-98, Yugawara, Japan, November 2016.
• Chang-Jun Ahn, and Yeon-Ho Chung, ``Performance Enhancement using Unitary Frequency Modulation with PLC and VLC Cooperation,'' Proc.of International Symposium on Nonlinear Theory and Its Applications ( NOLTA2016), pp.91-94, Yugawara, Japan, November 2016.
• Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka, and Kazuhisa Haeiwa, ``Power Conversion Efficiency of RF-DC Rectifier for RF Energy Harvesting,'' Proc. of International Symposium on Nonlinear Theory and Its Applications ( NOLTA2016), pp.89-90, Yugawara, Japan, November 2016.
• Atul Sewaiwar, Samrat Vikramaditya Tiwari, Yeon-Ho Chung, and Chang-Jun Ahn, ``Color Cell based Bidirectional VLC with User Mobility,'' Proc. of IEEE International Conference on Communications (ICC2016), pp.1-5, Kuala Lumpur, Malaysia, May 2016.
• Chang-Jun Ahn, ``Adaptive Spatio-Temporal White Space Sensing in Multiple Antenna,'' Proc. of International Conference on Adaptive and Self-Adaptive Systems and Applications (ADAPTIVE2016), pp.16-19, Rome, Italy, March 2016.
• Fumiaki Ukaji, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``Performance Enhancement with Applying FSS and ASB Method for MU-MIMO,'' Proc. of IEEE International Conference on Industrial Technology (ICIT2016), pp.860-865, Taipei, Taiwan, March 2016.
• Masaya Okamura, Chang-Jun Ahn, Tatsuya Omori and Ken-ya Hashimoto, ``Channel Compensation based on VPS and Time-Frequency Interferometry for Massive MIMO-OFDM,'' Proc. of IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS2015), pp.532-536, Bali, Indonesia, November 2015.
• Asato Kurihara, Chang-Jun Ahn, Tatsuya Omori and Ken-ya Hashimoto, ``An Application of OFDM-IDMA to Uplink Multiuser Visible Light Communication System,'' Proc. of IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS2015), pp.412-416, Bali, Indonesia, November 2015.
• Kotaro Abe, Chang-Jun Ahn, Tatsuya Omori and Ken-ya Hashimoto, ``Spatial Performance of Color Clustered VLC-MIMO Due to Incompleteness of Color Filters,'' Proc. of IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS2015), pp.417-421, Bali, Indonesia, November 2015.
• Ye Tian, Wenjian Wang and Chang-Jun Ahn, ``Accuracy Improvement using WLAN for Indoor Positioning System,'' Proc. of IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS2015), pp.474-478, Bali, Indonesia, November 2015.
• Chang-Jun Ahn, ``Wireless power transmission with rough beamforming method,'' Proc. of IEEE NAFOSTED Conference on Information and Computer Science (NICS2015), pp.263-267, Ho Chi Mihn, Vietnam, September 2015.
• Wenjian Wang, Ye Tian, and Chang-Jun Ahn, ``A Novel Time Synchronization Scheme for OFDM Systems Based on Variational Pseudo-Noise Preamble,'' Proc. of Asia-Pacific Symposium on Information and Telecommunication Technologies (APSITT 2015), pp.4-6, Colombo, Sri Lanka, August 2015.
• Hikaru Oka, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``IQ Imbalance and Carrier Frequency Offset Compensation Schemes for TFI-OFDM,'' Proc. of IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS2014), pp.17-22, Kuching, Malaysia, December 2014.
• Yuta Ida, Chang-Jun Ahn, Takahiro Matsumotoy, and Shinya Matsufuji, ``Performance Enhancement for AF Relay MIMO/OFDM with Complex HTRCI Pilot Signal,'' Proc. of IEEE Asia-Pacific Conference on Communications (APCC 2014), F3B-1, pp.1-5, Pattaya, Thailand, October 2014.
• Yosuke Fujii, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``PAPR Reduction for Visible Light Communication OFDM using FSS and PPS,'' Proc. of IEEE Asia-Pacific Conference on Communications (APCC 2014), F3B-5, pp.1-5, Pattaya, Thailand, October 2014.
• Chang-Jun Ahn, ``RF Energy Harvesting with W-CDMA,'' Proc. of IEEE International Symposium on Consumer Electronics (ISCE 2014), pp.213-214, Jeju, Korea, June 2014.
• Naotoshi Yoda, Wenjian Wang, and Chang-Jun Ahn, ``Single Symbol Decodable QO-STBC with Full Diversity,'' Proc. of IEEE International Conference on Signal Processing and Communication Systems (ICSPCS2013), pp.265-269, Gold Coast, Australia, December 2013.
• Hikaru Oka, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``IQ Imbalance Estimation and Compensation Schemes using TFI-OFDM System,'' Proc. of International Workshop on Signal Design and its Applications in Communications (IWSDA'13), pp.126-129, Tokyo, Japan, October 2013.
• Taichi Sakaue, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``Interference Compensation Scheme using Time Domain Replica Signals for SP-MIMO/OFDM under Large Delay Spread Channel greater than GI,'' IEEE International Conference on Computing and Communication Technologies (RIVF2013), pp.37-40, Hanoi, Vietnam, November 2013.
• Akihiro Kuroha, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``Power Priority Selection and Adaptive Clipping with Peak Reduction Signal for MUDiv/OFDMA,'' IEEE International Conference on Computing and Communication Technologies (RIVF2013), pp.85-90, Hanoi, Vietnam, November 2013.
• Kei Okubo, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``Enhancement of cell-edge throughput performance with CoMP transmission using QO-STBC scheme,'' Proc. of IEEE Global Conference on Consumer Electronics (GCCE 2013), pp.496-499, Makuharimeses, Tokyo, Japan, October 2013.
• Masayuki Kitakata, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``Throughput Performance Enhancement Applying Adaptive Modulation for Single Symbol Decodable QO-STBC with Full Diversity,'' Proc. of IEEE Asia-Pacific Conference on Communications (APCC 2013), pp.58-62, Bali, Indonesia, August 2013.
• Yuta Ida, Chang-Jun Ahn, Takahiro Matsumotoy, and Shinya Matsufuji, ``Mitigated Deep Faded Channel with Relay Node Allocation for MUDiv/OFDMA,'' Proc. of IEEE Asia-Pacific Conference on Communications (APCC 2013), pp.6-11, Bali, Indonesia, August 2013.
• Tomoki Yoshimura, Yuta Ida, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``Complexity Reducing QRM-MLD with Sequential Decision Based on the Estimated Noise Variance,'' Proc. of IEEE International Conference on Advanced Communications Technology(ICACT2013), pp.590-593, Pyeongchang, Korea, January 2013.
• Yuta Ida, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``Variable Splitting Transmission in Multi-Relay Cooperative Communications for SC-FDMA,'' Proc. of IEEE International Conference on Advanced Communications Technology(ICACT2013), pp.623-627, Pyeongchang, Korea, January 2013.
• Taichi Sakaue, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``Novel Time Domain Channel Estimation using a Cyclic Property of Scattered Pilot for OFDM in Large Delay Spread Channel,'' Proc. of IEEE International Conference on Advanced Communications Technology(ICACT2013), pp.594-598, Pyeongchang, Korea, January 2013.
• Satoshi Matsuo, Kazuhisa Haeiwa, Takeshi Kamio, Hisato Fujisaka, Yoshikazu Toba, and Chang-Jun Ahn, ``Optimum Designs on Electrode Structure for an LN Optical Modulator in the Microwave Band,'' Proc. of Asia-Pacific Microwave Photonics Conference 2012 (APMP2012), PA-5, pp.1-4, Kyoto, Japan, April 2012.
• Takeshi Kamio, Kazuhisa Haeiwa, Yoshikazu Toba, Hisato Fujisaka, and Chang-Jun Ahn, ``Considerations of Lumped Constant Type LN Optical Modulator Operating at 10 GHz Band,'' Proc. of Asia-Pacific Microwave Photonics Conference 2012 (APMP2012), WB-3, pp.1-4, Kyoto, Japan, April 2012.
• Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``Heterogeneous constellation based QOSTBC for improving detection property of QRD-MLD,'' Proc. of IEEE International Conference on Consumer Electronics (ICCE2012), pp.317-318, Las Vegas, USA, January 2012.
• Tomoki Yoshimura, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``Path-selection based adaptive guard interval for TFI-OFDM system,'' Proc. of IEEE International technical conference of Region 10 (TENCON 2011), pp.947-951, Bali, Indonesia, November 2011.
• Yuta Ida, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``Complex reduction method with low granularity block selection for TFI-MUDiv/OFDMA,'' Proc. of IEEE International technical conference of Region 10 (TENCON 2011), pp.867-871, Bali, Indonesia, November 2011.
• Shogo Soejima, Yuta Ida, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``Non-linear channel compensation method for OFDM under fast fading channel,'' Proc. of IEEE International technical conference of Region 10 (TENCON 2011), pp.930-933, Bali, Indonesia, November 2011.
• Chang-Jun Ahn, ``Development of RF energy harvesting and charging circuits for low power mobile devices,'' Proc. of International Conference on Circuits, Systems, Control and Signals (CSCS 2011) , pp.131-134, Prague, Czech Republics, September 2011.
• Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``Prototype of 5.8GHz Wireless Power Transmission System for Electric Vehicle System,'' Proc. of IEEE International Conference on Environmental Science and Technology (ICEST 2011), Singapore, vol.1 pp.128-131, February 2011.
• Chang-Jun Ahn, Incheol Jeong, Seong-Chul Cho, and Daeho Kim, ``Maritime VHF Communications with Polarization Diversity over a Rician Channel,'' Proc. of International Conference on Computer Science and Information Technology (ICCSIT 2011), Penang, Malaysia, pp.62-66, February 2011.
• Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``Resource Allocation of Adaptive Subcarrier Block with Frequency Symbol Spreading for OFDMA,'' Proc. of IEEE International Conference on Mobile Ubiquitous Computing, Systems, Services and Technologies (UBICOMM 2010), pp.151-156, Florence, Italy, October 2010.
• Yuta Ida, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``Throughput Performance Improvement for MUD/OFDMA Using MMSE Equalization Without Guard Interval','' Proc. of International Symposium on Spread Spectrum Techniques and Applications (ISSSTA2010), pp.221-226, Taichung, Taiwan, October 2010.
• Keisuke Nagata, Hisato Fujisaka, Takeshi Kamio, Chang-Jun Ahn, and Kazuhisa Haeiwa, ``Stochastic Resonance in Delay-Locked Loop Driven by Multiple Access Interferences,'' Proc. of IEEE Workshop on Nonlinear Circuit Networks, pp.62-65, Tokushima, Japan, December 2009.
• Chang-Jun Ahn, ``Spectrum Sensing in Multiple Antenna Cognitive Radio Systems Based on Generalized Likelihood-Ratio Test,'' Proc. of International Conference on Communication Technology (ICCT2009), ISSN: 2070-3724, pp.1-5, Bali, Indonesia, November 2009.
• Takeshi Kamio, Shohei Sugeo, Kunihiko Mitsubori, Takahiro Tanaka, Chang-Jun Ahn, Hisato Fujisaka, and Kazuhisa Haeiwa, ``A Reinforcement Learning Approach to Course Decision of Ships Under Navigation Rules,'' Proc. of International Symposium on Nonlinear Theory and its Applications (NOLTA2009), October 2009.
• Masanori Yofune, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``Channel Variance Estimation based Fast Fading Compensation for HTRCI-MIMO/OFDM,'' Proc. of International Conference on Wireless Personal Mobile Communications (WPMC2009), S26-4, pp.1-5, Sendai, Japan, September 2009.
• Yuta Ida, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``Large Delay Spread Cancellation based on Replica Signal for HTRCI-MIMO/OFDM,'' Proc. of International Conference on Wireless Personal Mobile Communications (WPMC2009), S11-4, pp.1-5, Sendai, Japan, September 2009.
• Takeshi Yoshimura, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``Performance Enhancement of ZF/MIMO-OFDM with Channel Ranking based Signal Detection,'' Proc. of International Conference on Wireless Personal Mobile Communications (WPMC2009), S17-1, pp.1-5, Sendai, Japan, September 2009.
• Chang-Jun Ahn, and Kazuhisa Haeiwa, ``HTRCI based Channel Ranking based Joint Symbols Detection for MQRD-PCM/MIMO-OFDM,'' Proc. of IEEE International Symposium on Consumer Electronics (ISCE2009), pp.779-783, Kyoto, Japan, May 2009.
• Chang-Jun Ahn, ``Channel Ranking based Joint Symbols Detection for MQRD-PCM/MIMO-OFDM,'' Proc. of IEEE Consumer Communications and Networking Conference (CCNC2009), Las Vegas, USA, January 2009.
• Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``Subcarrier Block Power Control for Adaptive Downlink OFDM with Frequency Spreading and Equalization,'' Proc. of IEEE International Conference on Mobile Ubiquitous Computing, Systems, Services and Technologies (UBICOMM 2008), pp.133-138, Valencia, Spain, September 2008.
• Masanori Yofune, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``Decision Direct and Linear Prediction based Fast Fading Compensation for TFI-OFDM,'' Proc. of ITC-CSCC2008, pp.81-84, July 2008.
• Yuta Ida, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``ISI and ICI Compensation for TFI-OFDM in Time-Variant Large Delay Spread Channel,'' Proc. of ITC-CSCC2008, pp.1309-1312, July 2008.
• Takeshi Yoshimura, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``Performance Enhancement of TFI-OFDM with Path Selection based Channel Identification,'' Proc. of ITC-CSCC2008, pp.1313-1316, July 2008.
• Chang-Jun Ahn, ``Simplified Iterative Parallel Detection Algorithm Using Multiple QR Decompositions with Permuted Channel Matrix and Discrete Pilot Assignment for SDM/OFDM,'' Proc. of IEEE International Conference on Communications and Electronics (HUT-ICCE 2008), pp.619-624, Hoi An, Vietnam, June 2008.
• Chang-Jun Ahn, ``Parallel Detection Algorithm Using Multiple QR Decompositions with Permuted Channel Matrix for SDM/OFDM,'' Proc. of IEEE International Symposium on Wireless Pervasive Computing (ISWPC2008), pp.101-105, Santorini, Greece, May 2008.
• Chang-Jun Ahn, ``High Time Resolution Carrier Interferometry for MIMO/OFDM,'' Proc. of IEEE Consumer Communications and Networking Conference (CCNC2008), FA1-S3-2, pp.1-5, Las Vegas, Nevada, USA, January 2008.
• Satoshi Takahashi and Chang-Jun Ahn, ``A Statistical Clutter Suppression Method Based on Given Target-Existence Probabilities for High Resolution UWB Radars,'' Proc. of International Conference on Wireless Personal Mobile Communications (WPMC 2007), pp.860-863, Jaipur, India, Dec., 2007.
• Chang-Jun Ahn, Satoshi Takahashi, and Kazuhisa Haeiwa, ``Time-Frequency Interferometry for OFDM,'' Proc. of IEEE Asia-Pacific Conference on Communications (APCC 2007), pp.153-156, Bangkok, Thailand, Oct., 2007.
• Chang-Jun Ahn, Satoshi Takahashi, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``Power Consumption for Coherent Optical Orthogonal Frequency Division Multiplexing with Punctured LDPC Codes and Variable Amplitude Block Codes,'' Proc. of IEEE Asia-Pacific Conference on Communications (APCC 2007), pp.465-468, Bangkok, Thailand, Oct., 2007.
• Satoshi Takahashi, Chang-Jun Ahn, and Kenji Ishida, ``A Battery Saving Method Based on Coordinate and Individual Sleeps for Ad-hoc Terminals,'' Proc. of IEEE Asia-Pacific Conference on Communications (APCC 2007), pp.159-162, Bangkok, Thailand, Oct., 2007.
• Chang-Jun Ahn, Satoshi Takahashi, and Makoto Taromaru, ``Link Correlation based Transmit Sector Antenna Selection for STBC/OFDM,'' Proc. of IEEE Wireless Communications and Networks Conference (WCNC 2007), ISBN:1-4244-0659-5, Hong Kong, China, March, 2007.
• Chang-Jun Ahn, Satoshi Takahashi, and Makoto Taromaru, ``Transmit Sector Selection with Link Correlation for SDM/OFDM Systems,'' Proc. of IEEE International Conference on Innovations in Information Technology (IIT 2006), Dubai, November, pp.1-5, 2006.
• Chang-Jun Ahn, and Makoto Taromaru, ``Pilot Frequency Nulling based Channel Estimation for Multiple QR-Decompositions with Transposed Channel Matrix SDM/OFDM,'' IEEE Information Theory Workshop (ITW 2006), Chengdu, China, Oct., pp.636-640, 2006.
• Satoshi Takahashi, Takehiko Kobayashi, Chang-Jun Ahn, Kenji Ishida, ``Effects of Partial Blocking of Transmission Array Antenna on Transmission Performance of MIMO Eigenbeam Space-Division Multiplexing,'' Proc. of IEEE HUT-ICCE 2006, pp.184-187, Hanoi, Vietnam, Oct. 2006.
• Satoshi Takahashi, Chang-Jun Ahn, and Kenji Ishida, ``An icosahedron antennas configuration for SVD-MIMO transmission,'' Proc. of The 3rd IEEE VTS Asia Pacific Wireless Communications Symposium (APWCS 2006), pp.324-327, Daejeon, Korea, Aug., 2006.
• Chang-Jun Ahn, Satoshi Takahashi, and Hiroshi Harada, ``Unitary Matrix Frequency Modulated OFDM for Power Line Communications over Impulsive Noise Channels,'' Proc. of International Conference on Electronic Hardware, Wireless and Optical Communications (EHAC2006), pp.45-49, Madrid, Spain, Feb., 2006.
• Chang-Jun Ahn, and Hiroshi Harada, ``Superimposed Frequency Symbol Based Adaptive Downlink OFDM with Frequency Spreading and Equalization,'' Proc. of IEEE Asia-Pacific Conference on Communications (APCC2005), pp.1068-1072, Perth, Australia, Oct., 2005.
• Chang-Jun Ahn, Satoshi Takahashi, and Hiroshi Harada, ``Adaptive Subcarrier Block Modulation with Differentially Modulated Pilot Symbol Assistance for Downlink OFDM Using Uplink Delay Spread,'' Proc. of IEEE International Symposium on Personal Indoor and Mobile Radio Communications (PIMRC2005), vol. E6-2, Berlin, Germany, Sept., 2005.
• Chang-Jun Ahn, Satoshi Takahashi, and Hiroshi Harada, ``Throughput Enhancement with Diffrentially Modulated Pilot Symbol Assisted Subcarrier Block Modulation Using Uplink Delay Spread for Adaptive Downlink OFDM,'' Proc. of International Conference on Wireless Personal Mobile Communications 2005, pp.877-881, Aalborg, Denmark, Sept., 2005.
• Chang-Jun Ahn, Satoshi Takahashi, Hiroshi Harada and Yukiyoshi Kamio, ``Enhancement of MLD for SDM/OFDM using Power Imbalance of Polarization and Pre-phase Distortion Scheme,'' IEEE International Conference on Personal Wireless Communications, pp.104-108, New Dehli, India, January, 2005.
• Satoshi Takahashi, Chang-Jun Ahn, Hiroshi Harada and Yukiyoshi Kamio, ``Stochastic determination method of substream modulation levels for MIMO eigenbeam space division multiplexing,'' IEEE International Conference on Personal Wireless Communications, pp.343-347, New Dehli, India, January, 2005.
• Hiroshi Harada, Chang-Jun Ahn, and Satoshi Takahashi, ``100Mbps and beyond hotspot communication prototypes for next generation mobile communication system,'' IEEE International Conference on Personal Wireless Communications, pp.24-28, New Dehli, India, January, 2005.
• Chang-Jun Ahn, Satoshi Takahashi, and Hiroshi Harada, ``Differential Modulated Pilot Symbol Assisted Adaptive OFDM for Reducing the MLI,'' Proc. of IEEE TENCON 2004, pp.577-580, Nov., Chiang Mai, Thailand.
• Satoshi Takahashi, Chang-Jun Ahn, and Hiroshi Harada, ``Site-dependent BER due to MIMO beamforming predicted by using ray tracing,'' Proc. of IEEE TENCON 2004, pp.204-207, Nov., Chiang Mai, Thailand.
• Satoshi Takahashi, Hiroshi Harada, Chang-Jun Ahn, and Yukiyoshi Kamio, ``Path loss dependence of delay spread in MIMO transmission,'' Proc. of WPMC 2004, vol. MA1-3, Sept., Abano Terme, Italy.
• Hiroshi Harada, Chang-Jun Ahn, Satoshi Takahashi, and Yukiyoshi Kamio, ``Dynamic parameter controlled orthogonal frequency and time division multiple access,'' IEEE International Symposium on Personal Indoor and Mobile Radio Communications (PIMRC2004), pp.2648-2652, Barcelona, Spain, Sept., 2004.
• Satoshi Takahashi, Hiroshi Harada, Chang-Jun Ahn, H. Iwai K. Yonezawa and T. Maeyama, ``Path loss dependence of delay spread at 5GHz in homogeneous suburban envirments,'' Proc. of Internation conference on Antennas and Propagation (ISAP 2004), pp.725-728, August, Sendai, Japan.
• Chang-Jun Ahn, Yukiyoshi Kamio, Satoshi Takahashi, and Hiroshi Harada , ``Heterogeneous Polarization Transmission Diversity Based on Alamouti Coded OFDM,'' Proc. of 11th IEEE International Conference on Telecommunications (ICT 2004), Fortaleza, Brazil, August, 2004.
• Chang-Jun Ahn, Yukiyoshi Kamio, Satoshi Takahashi, and Hiroshi Harada , ``Reverse Link Performance Improvement for an Wideband OFDM Using Alamouti Coded Heterogeneous Polarization Antennas,'' Proc. of 9th IEEE International Symposium on Computer and Communication (ISCC 2004), vol. 2, pp. 702~707, Alexandria, Egypt, June, 2004.
• Chang-Jun Ahn, ``Iterative decoding with LDPC based unitary matrix modulation with splitting over the coherence bandwidth for OFDM,'' Proc. of ICAI2003 (CD type:ISBN960-8052-92-0), Canary Islands, Spain, December, 2003.
• Naoki Yoshimochi, Tomohiro Hiramoto, Atsushi Mizuki, Chang-Jun Ahn and Iwao Sasase, ``LDPC coded unitary space time modulated OFDM system in broadband mobile channel,'' Proc. of 5th Asia-Pacific Symposium on Information and Telecommunication Technologies (APSITT2003), pp.409~413, Noumea, New Caledonia, November, 2003.
• Tsutomu Ohno, Tomokazu Kambayashi, Takaaki Horiuchi, Chang-Jun Ahn, and Iwao Sasase, ``MC-CDMA system using unitary space-time modulation on down-link broadband mobile radio channel,'' Proc. of 5th Asia-Pacific Symposium on Information and Telecommunication Technologies (APSITT2003), pp.347~352, Noumea, New Caledonia, November, 2003.
• Chang-Jun Ahn, and Iwao Sasase, ``Performance improvement of an OFDM using unitary matrix modulation with splitting over the coherence bandwidth in single antenna,'' Proc. of IEEE SoftCOM2003, pp.531~535, Split, Croatia, October, 2003.
• Chang-Jun Ahn, and Iwao Sasase, ``Convolutional coded coherent and differential unitary space-time modulated OFDM with bit interleaving for multiple antennas systems,'' Proc. of ISA2003 (CD type:ISBN960-8052-90-4), Malta, Sept., 2003.
• Chang-Jun Ahn, and Iwao Sasase, ``Adaptive array antenna based on radial basis function network as a multi-user detection for WCDMA systems,'' Proc. of International Conference on Communication System and Networks (CSN 2002), pp. 230-233, Malaga, Spain, Sept. 2002.
• Chang-Jun Ahn, and Iwao Sasase, ``Multiple pre-Rake filtering based on the predicted channel impulse response in the transmitter and a Rake combiner in the receiver for TDD/DS-CDMA mobile communication systems,'' Proc. of CSCC 2002, Crete, Greece, pp.6331-6336, July 2002.
• Chang-Jun Ahn, and Iwao Sasase, ``Code orthogonalizing filter based adaptive array antenna using common correlation matrix of time domain signals for multi-carrier DS/CDMA,'' Proc. of European Wireless 2002, Florence, Italy, pp.433-438, February 2002.

研究会（76件）

• 小島駿, 丸田一輝, 安昌俊, ``スペクトログラムを用いたCNNによる通信環境推定法における処理速度・スループット評価,'' 信学技報, vol.120, no.89, RCS2020-58, pp.1-6, 2020年7月.
• 小島駿, Yi Feng, 丸田一輝, 安昌俊, Vahid Tarokh, ``マルチユーザ環境におけるスペクトログラムを使用したSNR・ドップラーシフト同時検出法に関する検討,'' 信学技報, vol.120, no.10, RCS2020-4, pp.19-24, 2020年4月.
• 丸田一輝, 西森健太郎, 安昌俊, ``時間領域シンボル拡散ブラインドアダプティブアレーの主成分分析による特性改善,'' 信学技報, vol.119, no.296, RCS2019-226, pp.129-134, 2019年11月.
• 丸田一輝, 安昌俊, ``マルチセルMassive MIMOにおけるセミブラインドMMA及びMMSE-SMIによる多値信号への適応,'' 信学技報, vol.119, no.244, RCS2019-199, pp.115-120, 2019年10月.
• 小島駿, 丸田一輝, 安昌俊, ``スペクトログラムを用いた畳み込みニューラルネットワークによるSNR・ドップラー周波数の推定に関する一検討,'' 信学技報, vol.119, no.244, RCS2019-178, pp.1-6, 2019年10月.
• 丸田一輝, 小島駿, 安昌俊, ``深層学習を用いた受信信号からの通信環境推定,'' 電子情報通信学会 革新的無線通信技術に関する横断型研究会(MIKA), 2019年10月.
• 小島駿, 丸田一輝, 安昌俊, ``スペクトログラムを用いた畳み込みニューラルネットワークによるSNR・ドップラー周波数の推定に関する一検討,'' 第3回コミュニケーションクオリティ (CQ) 学生ワークショップ, 2019年9月.
• 小島駿, 丸田一輝, 安昌俊, ``畳み込みニューラルネットワークを用いたSNR推定法,'' 信学技報, vol.119, no.108, RCS2019-131, pp.149-154, 2019年7月.
• 丸田一輝, 小島駿, 中山悠, 久野大介, 安昌俊, ``無線信号の可視化情報を用いた深層学習によるSIR推定,'' 信学技報, vol.119, no.108, RCS2019-120, pp.107-108, 2019年7月.
• 小島駿, 丸田一輝, 安昌俊, ``適応変調符号化のためのニューラルネットワークを用いたSNR推定法,'' 信学技報, vol.119, no.90, RCS2019-94, pp.333-338, 2019年6月.
• 丸田一輝, 西森健太郎, 中山悠, 安昌俊, ``時間領域シンボル拡散を用いたブラインド型アダプティブアレー,'' 信学技報, vol.118, no.474, RCS2018-296, pp.77-82, 2019年3月.
• 丸田一輝, 小島駿, 中山悠, 久野大介, 安昌俊, ``無線信号の可視化情報を用いた機械学習による干渉推定,'' 革新的無線通信技術に関する横断型研究会(MIKA)技術交流会, 2019年2月.
• 丸田一輝, 安昌俊, ``マルチセルMassive MIMOシステムにおけるパイロット汚染除去のための干渉抑圧方式,'' 信学技報, vol.118, no.254, RCS2018-177, pp.143-148, 2018年10月.
• 丸田一輝, 中山悠, 本田一暁, 久野大介, 安昌俊, ``適応的モバイルネットワークにおける高周波数帯車載スモールセル基地局の歩車間通信特性,'' 信学技報, vol.118, no.254, RCS2018-167, pp.89-94, 2018年10月.
• 小島駿, 渡辺滉也, 赤尾貴志, 勝野将人, 丸田一輝, 安昌俊, ``周波数シンボル拡散を用いた適応変調符号化,'' 信学技報, vol.118, no.254, RCS2018-164, pp.71-76, 2018年10月.
• 丸田一輝, 田中健, 中山悠, 本田一暁, 久野大介, 安昌俊, ``ビークルセルによる適応的モバイルネットワークの構成及び歩車間通信特性,'' 電子情報通信学会 革新的無線通信技術に関する横断型研究会(MIKA), 2018年9月.
• 丸田一輝, 西森健太郎, 安昌俊, ``ブラインド型アダプティブアレーによる干渉抑圧：アルゴリズムの特性比較と応用について,'' 信学技報, vol.118, no.71, CQ2018-22, pp.25-30, 2018年5月.
• 丸田一輝, 安昌俊, ``フェージング環境におけるアンテナ選択によるCMA/MMAアダプティブアレーの干渉抑圧特性安定化,'' 信学技報, vol.117, no.504, CS2017-114, pp.151-155, 2018年3月.
• 丸田一輝, 安昌俊, ``マルチセルMassive MIMOアップリンクにおけるセミブラインド干渉抑圧のビームスペース法を用いた特性改善,'' 信学技報, vol.117, no.456, RCS2017-346, pp.167-172, 2018年2月.
• 丸田一輝, 安昌俊, ``マルチセルMassive MIMOアップリンクにおける判定帰還型チャネル推定を用いたセミブラインド干渉除去,'' 信学技報, vol.117, no.246, RCS2017-194, pp.143-148, 2017年10月.
• 丸田一輝, 安昌俊, ``ブラインド型アダプティブアレーアルゴリズムの干渉抑圧特性比較,'' 第4回コミュニケーションクオリティ（CQ）基礎講座ワークショップ, 2017年10月.
• 栗原麻人，安　昌俊, ``SICを用いたアップリンクマルチユーザ可視光OFDM-IDMAシステムの特性評価,'' IEICE Technical Report, CS2016-76, vol. 116, no. 468, pp. 1-6, February 2017.
• Chang-Jun Ahn, ``Wireless power transmission with rough beamforming method,'' IEICE Technical Report, CS2014-107, vol. 114, no. 463, pp. 87-90, February 2015.
• Wenjian Wang, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``Time synchronization scheme for OFDM systems based on variational pseudo-noise preamble,'' IEICE Technical Report, CS2014-106, vol. 114, no. 463, pp. 81-86, February 2015.
• Haiyan Teng, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``High speed beamforming technique for downlink multiuser MIMO/OFDM,'' IEICE Technical Report, CS2014-105, vol. 114, no. 463, pp. 77-80, February 2015.
• Yuta Ida, Eichiroh Nishikuma, Chang-Jun Ahn, Takahiro Matsumotoy, and Shinya Matsufuji, ``Achievement of Packet Splitting and Adaptive Modulation Based on Same Feedback Information for DF Cooperative Communications,'' IEICE Technical Report, CS2014-108, vol. 114, no. 463, pp. 91-94, February 2015.
• Wenjian Wang, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``Blind symbol synchronization scheme for preambleless OFDM systems based on cyclic prefixes in multipath channels,'' IEICE Technical Report, SRW2014-28, pp.19-24, October 2014.
• Hikaru Oka, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``Carrier Frequency offset and IQ imbalance Compensation Schemes for TFI-OFDM,'' IEICE Technical Report, SRW2014-29, pp.25-30, October 2014.
• Masayuki Kitakata, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``Performance Enhancement for Single Symbol Decodable AMC QO-STBC/OFDM with Asymmetric Constellation,'' IEICE Technical Report, SRW2014-30, pp.31-36, October 2014.
• Yosuke Fujii, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``PAPR Reduction for Visible Light Communication OFDM using FSS and PPS,'' IEICE Technical Report, SRW2014-31, pp.37-41, October 2014.
• Yuta Ida, Chang-Jun Ahn, Takahiro Matsumotoy, and Shinya Matsufuji, ``Enhanced Channel Estimation Based on Interference Variance for AF Relay Transmission C-HTRCI-MIMO/OFDM,'' IEICE Technical Report, SRW2014-27, pp.13-18, October 2014.
• Kei Okubo, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``Enhancement of cell-edge throughput performance with CoMP transmission using QO-STBC scheme,'' IEICE Technical Report, CS2012-102, vol. 112, no. 486, pp. 1-4, March 2013.
• Hikaru Oka, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``IQ Imbalance Estimation and Compensation Schemes using TFI-OFDM System,'' IEICE Technical Report, CS2012-103, vol. 112, no. 486, pp. 5-8, March 2013.
• Tomoki Yoshimura, Yuta Ida, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``Performance improvement with channel ranking and cutting the symbol candidate branchs for complexity reducing sequential decision with QRM-MLD,'' IEICE Technical Report, CS2012-104, vol. 112, no. 486, pp. 9-14March 2013.
• Akihiro Kuroha, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``Power Priority Selection for MUDiv/OFDMA and Adaptive Clipping due to Peak Reduction Signal ,'' IEICE Technical Report, CS2012-138, vol. 112, no. 486, pp. 209-214, March 2013.
• Masayuki Kitakata, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``Throughput Performance Enhancement applying Adaptive Modulation for Single Symbol Decodable QO-STBC with Full Diversity,'' IEICE Technical Report, CS2012-139, vol. 112, no. 486, pp. 215-218, March 2013.
• Taichi Sakaue, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``Interference Lump-sum Compensation Scheme using the Parallel Replica Signals for SP-MIMO/OFDM in the Large Delay Spread Channel,'' IEICE Technical Report, CS2012-140, vol. 112, no. 486, pp. 219-222, March 2013.
• Yuta Ida, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``Mitigated Deep Faded Channel with Relay Node Allocation for MUDiv/OFDMA,'' IEICE Technical Report, CS2012-137, vol. 112, no. 486, pp. 205-208, March 2013.
• Chang-Jun Ahn, ``Development of RF Energy Harvesting and Charging Circuits for Low Power Mobile Devices,'' IEICE Technical Report, CS2011-128, pp. 161-164, March 2012.
• Yuta Ida, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``Optimum Splitting Transmission in Multi-Relay Cooperative Communications for WF/PA-SC-FDMA,'' IEICE Technical Report, CS2011-127, pp. 157-160, March 2012.
• Tomoki Yoshimura, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``Complexity Reducing QRD-MLD with Threshold Method based on the Estimated Noise Variance,'' IEICE Technical Report, CS2011-115, pp. 93-96, March 2012.
• Taichi Sakaue, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``ISI and ICI Compensation with Large Delay Spread Channel Estimation based on Pilot Symbol's Cyclic Property for SP-OFDM,'' IEICE Technical Report, CS2011-114, pp. 87-91, March 2012.
• Naotoshi Yoda, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``A Design of Single Symbol Decodable QO-STBC with Full Diversity,'' IEICE Technical Report, CS2011-113, pp. 83-86, March 2012.
• Chang-Jun Ahn, ``Prototype of 5.8GHz Wireless Power Transmission System for Electric Vehicle System,'' IEICE Technical Report, CS2010-108, pp.215-218, March 2011.
• Chang-Jun Ahn, ``Maritime VHF Communications with Polarization Diversity over a Rician Channel,'' IEICE Technical Report, CS2010-109, pp.219-222, March 2011.
• Tomoki Yoshimura, Chang-Jun Ahn, Tatsuya Omori and Ken-ya Hashimoto, ``Adaptive guard interval control using path-selection for TFI-OFDM ,'' IEICE Technical Report, CS2010-76, pp.25-30, March 2011.
• Shogo Soejima, Chang-Jun Ahn, Tatsuya Omori and Ken-ya Hashimoto, ``Nonlinear channel compensation method for OFDM under fast fading channel ,'' IEICE Technical Report, CS2010-86, pp.85-89, March 2011.
• Chang-Jun Ahn, ``Reinforced Multiuser Diversity Using Frequency Symbol Spreading and Adaptive Subcarrier Block Selection for OFDMA,'' IEICE Technical Report, CS2009-44. pp.13-18, November 2009.
• Genki Kawahara, Shohei Sugeo, Takeshi Kamio, Chang-Jun Ahn, Hisato Fujisaka, and Kazuhisa Haeiwa, ``ARTMAP with Anti-Supervised Learning,'' IEICE Technical Report, NLP2008-166, pp.87-92, March 2009.
• Yuji Ohba, Keisuke Nagata, Hisato Fujisaka, Takeshi Kamio, Chang-Jun Ahn, and Kazuhisa Haeiwa, ``A Steady-State Analysis of 2-Delta Delay-Locked Loop by Discrete-Time Piecewise Linear Modeling,'' IEICE Technical Report, NLP2008-169, pp.105-109, March 2009.
• Shohei Sugeo, Takeshi Kamio, Kunihiko Mitsubori, Takahiro Tanaka, Chang-Jun Ahn, Hisato Fujisaka, and Kazuhisa Haeiwa, ``Reinforcement Learning to Find the Course of Multi-Ships,'' IEICE Technical Report, NLP2008-167, pp.93-98, March 2009.
• Kazuhiro Kusaka, Hisato Fujisaka, Takeshi Kamio, Chang-Jun Ahn, and Kazuhisa Haeiwa, ``On a Partial Difference Equation Describing a Cellular-Array-Type Parallel Markovian Sequence Generator,'' IEICE Technical Report, NLP2008-89, pp.101-105, December 2008.
• Keisuke Nagata, Hisato Fujisaka, Takeshi Kamio, Chang-Jun Ahn, and Kazuhisa Haeiwa, ``Stochastic Resonance in Delay-Locked Loop Driven by Multiple Access Interfarences,'' IEICE Technical Report, NLP2008-85, pp.81-86, December 2008.
• Chang-Jun Ahn, ``Performance Enhancement of MQRD-PCM/MIMO-OFDM using Channel Ranking based Joint Symbols Detection,'' IEICE Technical Report, CS2008-37, pp71-76, November 2008.
• Takeshi Kamio, Kunihiko Mitsubori, Chang-Jun Ahn, Hisato Fujisaka, and Kazuhisa Haeiwa, ``A Note on Expansion and Contraction of Categories in Fuzzy ARTMAP,'' IEICE Technical Report, NLP2007-171, pp.25-30, March 2008.
• Keisuke Nagata, Hisato Fujisaka, Takeshi Kamio, Chang-Jun Ahn, and Kazuhisa Haeiwa, ``A Stochastic Method for the Analysis of Delay-Locked Loops in Quasi-Synchronous CDMA Communication,'' IEICE Technical Report, NLP2007-178, pp.67-72, March 2008.
• Keita Hayashi, Hisato Fujisaka, Takeshi Kamio, Chang-Jun Ahn, and Kazuhisa Haeiwa, ``Time-Domain Analysis of Second-Order Sigma-Delta Modulators with Small Quantizer Overload,'' IEICE Technical Report, NLP2007-179, pp.73-78, March 2008.
• Kyohei Ike, Kazuhisa Haeiwa, Takeshi Kamio, Hisato Fujisaka, Chang-Jun Ahn, and Yoshikazu Toba, ``Considerations of Electrode Structuure for an LN Optical Modulator in the Microwave Band,'' IEICE Technical Report, RCS2007-169, pp.49-54, January 2008.
• Chang-Jun Ahn, Satoshi Takahashi, and Kazuhisa Haeiwa, ``Time-Frequency Interferometry for OFDM,'' IEICE Technical Report, WBS2007-32, pp.1-4, October 2007.
• Chang-Jun Ahn, Satoshi Takahashi, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``Power Consumption for Coherent Optical Orthogonal Frequency Division Multiplexing with Punctured Convolutional Codes and Variable Amplitude Block Codes,'' IEICE Technical Report, WBS2007-33, pp.5-9, October 2007.
• Satoshi Takahashi, and Chang-Jun Ahn, ``A statistical clutter suppression method based on given target-existence probabilities for high resolution UWB radars,'' IEICE Technical Report, WBS2007-37, pp.27-31, October 2007.
• Chang-Jun Ahn, Satoshi Takahashi, and Makoto Taromaru, ``High Time Resolution Carrier Interferometry for SDM/OFDM,'' IEICE Technical Report, RCS2006-227, pp.63-66, January, 2007.
• Chang-Jun Ahn, Satoshi Takahashi, and Makoto Taromaru, ``Transmit Sector Selection with Considering the Link Correlation for SDM/OFDM Systems,'' IEICE Technical Report, RCS2006-231, pp.85-89, January, 2007.
• Chang-Jun Ahn, and Hiroshi Harada, ``Multiple Transposed Channel Matrix QR Decompositions based Sphere Detection Algorithm for MLD-SDM/OFDM,'' IEICE Technical Report, RCS2005-47, pp.43-47, July, 2005.
• Chang-Jun Ahn, Satoshi Takahashi, and Hiroshi Harada, ``Adaptive Sub-carrier Block Modulation with Differentially Modulated Pilot Symbol Assistance for Down-link OFDM Using Up-link Delay Spread,'' IEICE Technical Report, RCS2004-298, pp.49-54, January. 2005.
• Satoshi Takahashi, Chang-Jun Ahn, Hiroshi Harada, and Yukiyoshi Kamio, ``Stochastic prediction of transmission errors in MIMO eigenbeam space division multiplexing,'' IEICE Technical Report, RCS2004-294, January. 2005.
• Chang-Jun Ahn, Satoshi Takahashi, and Hiroshi Harada, ``Differential Modulated Pilot Symbol Assisted Adaptive OFDM for Reducing the MLI with Predicted FBI,'' IEICE Technical Report, RCS2004-109, pp.25-28, July. 2004.
• Hiroshi Harada, Chang-Jun Ahn, Satoshi Takahashi, and Yukiyoshi Kamio, ``New Generation Mobile Communication System by Dynamic Parameter Controlled OF/TDMA,'' IEICE Technical Report, RCS2003-284, pp.41-46, Jan. 2004.
• Chang-Jun Ahn, Yukiyoshi Kamio, Satoshi Takahashi, and Hiroshi Harada, ``Antenna-Phase Controlled SDM/OFDM with Polarization Diversity for Dynamic Parameter Controlled OFDM System,'' IEICE Technical Report, RCS2003-283, pp.33-39, Jan. 2004.
• Chang-Jun Ahn, Yukiyoshi Kamio, Satoshi Takahashi, and Hiroshi Harada , ``Reverse Link Performance Improvement for Dynamic Parameter Controlled OFDM Using Alamouti Coded Heterogeneous Polarization Antennas,'' IEICE Technical Report, RCS2003-248, pp.25-30, Jan. 2004.
• Tsutomu Ohno, Tomokazu Kambayashi, Takaaki Horiuchi, Chang-Jun Ahn, and Iwao Sasase, ``MC-CDMA system using unitary space-time modulation on down-link broadband mobile radio channel,'' IEICE Technical Report, RCS2003-7, April, 2003.
• Naoki Yoshimochi, Tomohiro Hiramoto, Atsushi Mizuki, Chang-Jun Ahn, and Iwao Sasase, ``LDPC coded unitary space-time modulated OFDM in broadband mobile channel,'' IEICE Technical Report, RCS2002-268, pp.91-96, Jan., 2003.
• Atsushi Mizuki, Chang-Jun Ahn, and Iwao Sasase, ``Iterative channel estimation scheme by taking the channel states of sub-carriers into mobile OFDM system,'' IEICE Technical Report, RCS2002-267, pp.85-90, Jan., 2003.
• Chang-Jun Ahn, and Iwao Sasase, ``Pilot symbol assisted high speed packet transmission system based on adaptive OFDM in broadband mobile channel,'' IEICE Technical Report, SST2002-47, pp.75-80, October, 2002.
• Chang-Jun Ahn, and Iwao Sasase, ``Convolutional coded coherent and differential unitary space-time modulated OFDM with bit interleaving for multiple antennas systems,'' IEICE Technical Report, SST2002-46, pp.65-73, October, 2002.
• Chang-Jun Ahn, and Iwao Sasase, ``Adaptive array antenna based on radial basis function network as a multi-user detection for WCDMA systems,'' IEICE Technical Report, SST2002-1, pp.1-5, June, 2002.

全国大会（91件）

• 田村幸佑, 小島駿, 中野宏紀, 丸田一輝, 安昌俊, ``マルチモーダルCNNによる少量データセットにおける高精度なSNR分類,'' 2023年電子情報通信学会ソサイエティ大会, B-5-83, 2023年9月.
• 中野宏紀, 田村幸佑, 安昌俊, ``Pre-Distorted ADO-OFDM送信機における計算量削減手法 ,'' 2023年電子情報通信学会ソサイエティ大会, B-８-７, 2023年9月.
• 宮本晃希, 安昌俊, “マルチセル環境におけるダウリンクマルチユーザMassive MIMOのMRTプリコーティングを用いた際のアウテージ確率解析,” 2022年電子情報通信学会東京支部学生研究発表会, 2022年3月.
• 柴倉貴紀, 安昌俊, “適応送信電力制御と適応変調を用いたFSS-OFDMAにおける性能改善,” 2022年電子情報通信学会東京支部学生研究発表会, 2022年3月.
• 西部浩司, 安昌俊, “MIMOプリコーティングシステムにおけるIQインバランス補償法,” 2022年電子情報通信学会東京支部学生研究発表会, 2022年3月.
• 後藤佑太, 小島駿, 丸田一輝, 安昌俊, “ニューラルネットワークを利用したOFDMシステムのシンボルタイミング同期法,” 2020年電子情報通信学会総合大会, B-8-34, 2020年3月.
• 平野星也, 高橋光貴, 小島駿, 丸田一輝, 安昌俊, “VLC-OFDM-IDMAシステムにおけるFSSを用いたSICの性能改善,” 2020年電子情報通信学会総合大会, B-8-33, 2020年3月.
• 花田稔弥, 妹尾克哉, 丸田一輝, 安昌俊, “平面アレーアンテナの回転による到来方向推定精度の向上,” 2020年電子情報通信学会総合大会, B-5-162, 2020年3月.
• 大金史歩, 妹尾克哉, 丸田一輝, 安昌俊, “OFDM-CMAにおける干渉信号のタイミングオフセットに対する抑圧効果,” 2020年電子情報通信学会総合大会, B-5-161, 2020年3月.
• 小林宏彰, 妹尾克哉, 丸田一輝, 杉山隆利, 安昌俊, “STPA-BAA方式におけるSLMを用いたPAPR低減,” 2020年電子情報通信学会総合大会, B-5-132, 2020年3月.
• 向井和輝, 丸田一輝, 牟田修, 安昌俊, “Massive MIMOにおける低演算量ユーザ間干渉抑圧方式の特性改善,” 2020年電子情報通信学会総合大会, B-5-74, 2020年3月.
• 荒井甲, 丸田一輝, 安昌俊, “未知干渉存在下におけるアップリンクマルチユーザMassive MIMOヌル空間拡張,” 2020年電子情報通信学会総合大会, B-5-46, 2020年3月.
• 舟木信貴, 丸田一輝, 安昌俊, “干渉波部分空間の次元削減によるマルチユーザMassive MIMOヌル空間拡張法のSINR特性改善,” 2020年電子情報通信学会総合大会, B-5-45, 2020年3月.
• 赫赫, 大村高輝, 丸田一輝, 安昌俊, “分散パイロット配置及びRBF補間を用いたGRNNチャネル推定,” 2020年電子情報通信学会総合大会, B-5-38, 2020年3月.
• 小島駿, 丸田一輝, 安昌俊, “スペクトログラムを用いた通信環境推定法によるスループット特性評価,” 2020年電子情報通信学会総合大会, B-5-37, 2020年3月.
• 浪江耀人, 小島駿, 丸田一輝, 安昌俊, “コンスタレーションを用いた畳み込みニューラルネットワークによるSNR推定,” 2020年電子情報通信学会総合大会, B-5-36, 2020年3月.
• 丸田一輝, 井田悠太, 安昌俊, “OFDM櫛型パイロットにおける繰り返しIDFT/DFTによるCSI補間,” 2020年電子情報通信学会総合大会, B-5-22, 2020年3月.
• 丸田一輝, 小島駿, 中山悠, 久野大介, 安昌俊, “無線信号の可視化情報を用いた深層学習による干渉レベル推定,” FIT2019 第18回情報科学技術フォーラム, M-014, 2019年9月.
• 島田一志, 高橋光貴, 丸田一輝, 安 昌俊, “アップリンクマルチユーザ可視光OFDM-IDMAシステムの拡散符長最適化による性能改善,” 2019年電子情報通信学会総合大会, ISS-P-006 , 2019年3月.
• 三浦七輝, 渡辺滉也, 丸田一輝, 安 昌俊, “組織的Polar符号を用いたOFDMシステムの性能改善,” 2019年電子情報通信学会総合大会, ISS-A-025 , 2019年3月.
• 田邉郁人, 大村高輝, 丸田一輝, 安 昌俊, “高速フェージング下におけるニューラルネットワークを用いた2×2MIMOのチャネル推定・補償,” 2019年電子情報通信学会総合大会, ISS-A-024 , 2019年3月.
• 阿部由希帆, 安 昌俊, 丸田一輝, “TFI-OFDMにおけるIQインバランス補償の演算量削減,” 2019年電子情報通信学会総合大会, ISS-A-023 , 2019年3月.
• 一色健太郎, 篠木勇冶, 安昌俊, 丸田一輝, “プリアンブルレスOFDMシステムにおける複数シンボルを用いたタイミング同期性能改善,” 2019年電子情報通信学会総合大会, B-8-8, 2019年3月.
• 篠木勇冶, 一色健太郎, 丸田一輝, 安昌俊, “プリアンブルレスOFDMシステムの同期取得における雑音の影響の低減,” 2019年電子情報通信学会総合大会, B-8-7, 2019年3月.
• 立松弘貴, 阿部由希帆, 丸田一輝, 安昌俊, “IQ imbalance下におけるMMSECを用いた性能改善,” 2019年電子情報通信学会総合大会, B-8-5, 2019年3月.
• 松原駆, 黒木駿, 勝野将人, 丸田一輝, 安昌俊, “複素信号を用いたHTRCI法によるパイロットコンタミネーション除去,” 2019年電子情報通信学会総合大会, B-8-4, 2019年3月.
• Nythanel Hoeur, 大村高輝, 丸田一輝, 安昌俊, “一般回帰ニューラルネットワークを利用したチャネル推定と補償,” 2019年電子情報通信学会総合大会, B-8-3, 2019年3月.
• 田沼直也, 丸茂稜, 渡辺滉也, 丸田一輝, 安昌俊, “TFIによる組織的Polar符号を用いたOFDMのスループット特性改善,” 2019年電子情報通信学会総合大会, B-8-2, 2019年3月.
• 黒木駿, 松原駆, 勝野将人, 丸田一輝, 安昌俊, “改良型HTRCIチャネル推定によるパイロットコンタミネーション除去,” 2019年電子情報通信学会総合大会, B-5-66, 2019年3月.
• 本杉晃一, 米井賢太郎, 丸田一輝, 安昌俊, “分割ブロック符号における繰り返しチャネル推定の二次外挿による性能改善,” 2019年電子情報通信学会総合大会, B-5-65, 2019年3月.
• 島康介, 妹尾克哉, 後藤健太, 赤尾貴志, 丸田一輝, 安昌俊, “共通共分散行列を用いたSMI法の判定帰還による干渉抑圧特性改善,” 2019年電子情報通信学会総合大会, B-5-46, 2019年3月.
• 丸田一輝, 安昌俊, “マルチセルMassive MIMOにおけるセミブラインドMMA及びMMSE-SMIによる多値信号適用時の動作改善,” 2019年電子情報通信学会総合大会, B-5-42, 2019年3月.
• 伊藤香貴, 丸田一輝, 安昌俊, “Massive MIMOダウンリンクのMFプリコーディングにおける端末マルチアンテナ環境下でのアウテージ確率解析,” 2019年電子情報通信学会総合大会, B-5-41, 2019年3月.
• 丸茂稜, 田沼直也, 渡辺滉也, 丸田一輝, 安昌俊, “組織的Polar符号化MIMO-OFDMにおけるHTRCI及びパンクチャリングによるスループット改善,” 2019年電子情報通信学会総合大会, B-5-11, 2019年3月.
• 丸田一輝, 中山悠, 田中健, 安永遼真, 菅宣理, 本田一暁, 久野大介, 安昌俊, “ビークルセルネットワークの無線フロントホールにおけるビーム追従法,” 情報処理学会全国大会, 1F-04, 2019年3月.
• 丸田一輝, 中山悠, 本田一暁, 久野大介, 安昌俊, “適応的モバイルネットワークにおける車載スモールセル基地局の歩車間通信特性,” 2018年電子情報通信学会ソサイエティ大会, B-5-4, 2018年9月.
• 丸田一輝, 中山悠, 本田一暁, 久野大介, 安昌俊, “車載スモールセル基地局における歩車間通信特性,” FIT2018 第17回情報科学技術フォーラム, CM-005, 2018年9月.
• 堀越尉央, 渡辺滉也, 丸田一輝, 安昌俊, “高符号化率Polar符号を用いたOFDMの性能比較,” 2018年電子情報通信学会総合大会, ISS-P-011, 2018年3月.
• 鈴木健一郎, 手塚賢, 丸田一輝, 安昌俊, “アップリンクマルチユーザ可視光OFDM-IDMAシステムによる処理遅延改善のためのSIC,PIC 結合処理を用いた干渉除去,” 2018年電子情報通信学会総合大会, ISS-P-010, 2018年3月.
• 米井賢太郎, 渡辺滉也, 丸田一輝, 安昌俊, “ブロック符号における繰り返しチャネル推定の処理遅延低減と性能改善,” 2018年電子情報通信学会総合大会, B-8-28, 2018年3月.
• 大村高輝, 小島駿, 丸田一輝, 安昌俊, “ニューラルネットワークを利用したチャネル推定・補償,” 2018年電子情報通信学会総合大会, B-8-27, 2018年3月.
• 後藤健太, 赤尾貴志, 丸田一輝, 安昌俊, “2D Massive MIMOシステムにおける低演算量到来方向推定法,” 2018年電子情報通信学会総合大会, B-5-17, 2018年3月.
• 妹尾克哉, 赤尾貴志, 丸田一輝, 安昌俊, “サブキャリア送信電力制御及びブラインドアダプティブアレーによる周波数共用方式における適応変調を用いた動作領域の拡大,” 2018年電子情報通信学会総合大会, B-5-16, 2018年3月.
• 丸田一輝, 安昌俊, “マルチセルMassive MIMOアップリンクにおけるセミブラインド干渉抑圧の特性改善,” 2018年電子情報通信学会総合大会, B-5-15, 2018年3月.
• 丸田一輝, 安昌俊, “アンテナ選択によるCMAアダプティブアレーの干渉抑圧特性安定化,” 2017年電子情報通信学会ソサイエティ大会, B-5-69, 2017年9月.
• 勝野将人, 安昌俊, 丸田一輝, “HTRCIを利用したチャネル推定およびセクター選択によるMIMO/OFDMシステムのスループット特性の改善,” 2017年電子情報通信学会ソサイエティ大会, B-5-17, 2017年9月.
• 渡辺滉也, 丸田一輝, 安昌俊, “組織的Polar 符号を用いたMIMO-OFDMシステムの性能評価,” 2017年電子情報通信学会ソサイエティ大会, B-5-13, 2017年9月.
• 小島駿, 丸田一輝, 安昌俊, “FSS-OFDMシステムにおける最適化適応変調と送信電力制御,” 2017年電子情報通信学会ソサイエティ大会, B-5-4, 2017年9月.
• 渡辺 滉也, 樋口 翔一, 安　昌俊, ``Polar符号を用いたMIMO-OFDM性能評価,'' IEICE General Conference, no.B-8-1, pp.174, March 2017.
• 赤尾 貴志, 太郎田 智史, 安　昌俊, ``共通共分散SMIアルゴリズムの性能改善,'' IEICE General Conference, no.B-8-2, pp.175, March 2017.
• 勝野 将人, 樋口 翔一, 安　昌俊, ``上下リンク相関を利用した送信セクター選択法,'' IEICE General Conference, no.B-8-3, pp.176, March 2017.
• 紫垣 大斗, 田 冶, 手塚 賢, 安　昌俊, ``加重最小二乗法による高精度屋内位置検出の検討,'' IEICE General Conference, no.B-8-4, pp.177, March 2017.
• 藤城 真祥, 太郎田 智史, 安　昌俊, ``プリアンブルレス OFDM システムにおける相関ブロックを用いた同期取得法,'' IEICE General Conference, no.B-8-5, pp.178, March 2017.
• 小島 駿, 手塚 賢, 安　昌俊, ``中継ノードのモビリティーを考慮した最適化適用変調,'' IEICE General Conference, no.B-8-6, pp.179, March 2017.
• 太郎田智史, 藤井洋佑, 宇梶史哲, 安　昌俊, 橋本研也, ``マルチユーザー MIMOにおける偏波特性を用いた信号分離法,'' IEICE General Conference, no.B-8-7, March 2016.
• 樋口翔一, 宇梶史, 安　昌俊, 橋本研也, ``Massive MIMOにおける並列推定を用いた計算量削減法,'' IEICE General Conference, no.B-8-8, March 2016.
• 手塚　賢, 岡村真, 宇梶史哲, 安　昌俊, 橋本研也, ``チャネルランキングQRM-MLDを適用したAF方式協調通信,'' IEICE General Conference, no.B-8-9, March 2016.
• 齋藤　匠, 藤井洋佑, 安　昌俊, 橋本研也, `` 再配列QR分解を用いたQRM-MLDの性能改善,'' IEICE General Conference, no.B-8-10, March 2016.
• Chang-Jun Ahn, `` Power Conversion Efficience of RF-DC Rectifier for Energy Harvesting,'' IEICE General Conference, no.B-8-11, March 2016.
• 栗原麻人, 安　昌俊, 大森達也, 橋本研也, ``OFDM-IDMAを用いた可視光通信システムの特性評価,'' IEICE General Conference, no.B-8-24, March 2015.
• 岡　光, 安　昌俊, 大森達也, 橋本研也, ``ペア平均を用いたTFI-OFDMにおけるIQインバランス推定補償法,'' IEICE General Conference, no.B-8-25, March 2015.
• 宇梶史哲, 安　昌俊, 大森達也, 橋本研也, ``チャネル状態と干渉を考慮した適応サブキャリアブロック選択法によるMU-MIMOの性能改善,'' IEICE Society Conference, no.B-8-26, March 2015.
• 岡村真哉, 安　昌俊, 大森達也, 橋本研也, ``Massive MIMO-OFDMにおけるVPSを用いたTFI-CE法によるチャネル推定,'' IEICE General Conference, no.B-8-27, March 2015.
• 茂木勇樹, 岡　光, 安　昌俊, 大森達也, 橋本研也, ``TFI-OFDMにおけるスクランブル符号の相関とパス選択法を用いたCFOの補償法,'' IEICE General Conference, no.B-8-12, March 2014.
• 岡　光, 安　昌俊, 大森達也, 橋本研也, ``TFI-OFDMにおけるIQインバランス・周波数オフセット推定補償法,'' IEICE General Conference, no.B-8-13, March 2014.
• 坂上太一, 安　昌俊, 大森達也, 橋本研也, ``SP-MIMO/OFDMにおける超遅延波に対するNull信号を用いた干渉補償法,'' IEICE General Conference, no.B-8-14, March 2014.
• Chang-Jun Ahn・Ken-ya Hashimoto, ``RBF Based Non-linear Channel Equalization for Multiuser MIMO-OFDM,'' IEICE General Conference, no.B-8-15, March 2014.
• 井田悠太, 安　昌俊, 松元隆博, 松藤信哉, ``AFリレーMIMO/OFDMにおける複素HTRCIパイロット信号を用いた性能強化,'' IEICE General Conference, no.B-8-16, March 2014.
• 黒羽晃洋, 安　昌俊, 大森達也, 橋本研也, ``OFDMにおけるサイド情報を伴わない電力優先配置,'' IEICE General Conference, no.B-8-17, March 2014.
• Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto, ``Heterogeneous constellation based QRD-MLD for QOSTBC,'' IEICE Society Conference, no.B-8-38, September 2011.
• Yuta Ida, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``Complexity Reduction Method with Low Granularity Block Selection for TFI-MUDiv/OFDMA,'' IEICE General Conference, no.B-8-34, March 2011.
• Chang-Jun Ahn, and Jinho Choi, ``Channel Ranking based Joint Symbols Detection for MQRD-PCM/MIMO-OFDM,'' IEICE General Conference, March 2009.
• Masanori Yofune, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``Channel Variance Estimation based Fast Fading Compensation for HTRCI-MIMO/OFDM,'' IEICE General Conference, March 2009.
• Yuta Ida, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``ISI and ICI Compensation for HTRCI-MIMO/OFDM in Time-Variant Large Delay Spread Channel,'' IEICE General Conference, March 2009.
• Takeshi Yoshimura, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``Performance Enhancement of ZF/MIMO-OFDM with Channel Ranking based Signal Detection,'' IEICE General Conference, March 2009.
• Chang-Jun Ahn, and Incheol Jeong, ``Channel Ranking based Joint Symbols Detection for MQRD-PCM/MIMO-OFDM,'' IEICE SIP Symposium, no.B5-2, pp.310-315, November 2008.
• Masanori Yofune, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``Decision Direct and Linear Prediction based Fast Fading Compensation for TFI-OFDM,'' IEICE General Conference, no.B-8-18, pp.261, March 2008.
• Yuta Ida, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``ISI and ICI Compensation for TFI-OFDM in Time-Variant Large Delay Spread Channel,'' IEICE General Conference, no.B-8-19, pp.262, March 2008.
• Takeshi Yoshimura, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``Performance Enhancement of TFI-OFDM with Path Selection based Channel Identification,'' IEICE General Conference, no.B-8-20, pp.263, March 2008.
• Tsubasa Katao, Hisato Fujisaka, Takeshi Kamio, Chang-Jun Ahn, and Kazuhisa Haeiwa, ``Noise Shaping and Sigma-Delta Domain Circuit by Using Single-Electron Tunneling Device,'' IEICE General Conference, no.AS-2-3, pp.S11-S12, March 2008.
• Chang-Jun Ahn, Satoshi Takahashi, Takeshi Kamio, Hisato Fujisaka and Kazuhisa Haeiwa, ``Time-Frequency Interferometry for OFDM,'' IEICE Society Conference, no.B-8-21, pp.173, Sept., 2007.
• Satoshi Takahashi, Chang-Jun Ahn, and Kenji Ishida, ``A Battery Saving Method Based on Coordinate and Individual Sleeps for Ad-hoc Terminals,'' IEICE Society Conference, n.B-21-17, pp.419, Sept., 2007.
• Chang-Jun Ahn, Satoshi Takahashi, and Makoto Taromaru, ``High Time Resolution Carrier Interferometry for SDM/OFDM,'' Proc. of IEICE General Conference, no. B-5-89, pp.503, March, 2007.
• Chang-Jun Ahn, Makoto Taromaru, and Satoshi Takahashi, ``Link Correlation based Transmit Sector Antenna Selection for STBC/OFDM,'' Proc. of IEICE Society Conference, no. B-8-8, pp.174, Sept., 2006.
• Satoshi Takahashi, Takehiko Kobayashi, Chang-Jun Ahn, and Kenji Ishida, ``An Effect of Transmission Antenna Obstruction for MIMO eigenbeam Space Division Multiplexing,'' Proc. of IEICE Society Conference, no. B-1-214, pp. 214, Sept., 2006.
• Chang-Jun Ahn, Satoshi Takahashi, Hiroshi Harada, and Yukiyoshi Kamio, ``Adaptive Sub-carrier Block Modulation with Differentially Modulated Pilot Symbol Assistance for Down-link OFDM Using Up-link Delay Spread,'' Proc. of IEICE General Conference, March, 2005.
• Chang-Jun Ahn, Satoshi Takahashi, Hiroshi Harada, and Yukiyoshi Kamio, ``Differential Modulated Pilot Symbol Assisted Adaptive OFDM for Reducing the MLI with Predicted FBI ,'' Proc. of IEICE Society Conference, no. BS-8-4, pp.5, Sept., 2004.
• Chang-Jun Ahn, Yukiyoshi Kamio, Satoshi Takahashi, and Hiroshi Harada, ``Imbalanced power of polarization based Antenna-Phase Controlled SDM/OFDM System,'' Proc. of IEICE General Conference, no. B-5-63, pp.550, March. 2004.
• Hiroshi Harada, Chang-Jun Ahn, Satoshi Takahashi, and Yukiyoshi Kamio, ``New Generation Mobile Communication System by Dynamic Parameter Controlled OF/TDMA,'' Proc. of IEICE General Conference, no. B-5-64, pp. 551, March. 2004.
• Satoshi Takahashi, Hiroshi Harada, Chang-Jun Ahn, and Yukiyoshi Kamio, ``MIMO channel capacity prediction by using ray tracing,'' Proc. of IEICE General Conference, no. B-1-223, pp. 223, March. 2004.
• Chang-Jun Ahn, and Iwao Sasase, ``Performance Improvement of an OFDM using Unitary Code Matrix Modulation with Symbol Interleaving in Single Antenna,'' Proc. of IEICE Tokyo Section General Conference, vol. 1, pp.21, March, 2003.

特許（24件）

• Chang-Jun Ahn, and Masayuki Fujise, ``Transmitter Apparatus, Receiver Apparatus, Tranmitting Method, Receiving Method, and Program,'' 7969860B2 (USA), 28 June 2011.
• Chang-Jun Ahn, ``Transmitter Apparatus, Receiver Apparatus, Tranmitting Method, Receiving Method, and Program,'' 1662684(EU), 5 January 2011.
• Chang-Jun Ahn, ``Transmitter Apparatus, Receiver Apparatus, Tranmitting Method, Receiving Method, and Program,'' 4649601(Japan), 24 December 2010.
• Chang-Jun Ahn, ``Communication System, Transmitter, Receiver, Transmitting Method, Receiving Method, and Program,'' 7826546B2 (USA), 2 November 2010.
• Chang-Jun Ahn, and Hiroshi Harada, ``Transmitter Apparatus, Receiver Apparatus, Tranmitting Method, Receiving Method, and Program,'' 4581134(Japan), 10 September 2010.
• Chang-Jun Ahn, ``Transmitter Apparatus, Receiver Apparatus, Tranmitting Method, Receiving Method, and Program,'' 4366506(Japan), 4 September 2009.
• Chang-Jun Ahn, ``Transmitter Apparatus, Receiver Apparatus, Tranmitting Method, Receiving Method, and Program,'' 4362592(Japan), 28 August 2009.
• Chang-Jun Ahn, ``Transmitter Apparatus, Receiver Apparatus, Tranmitting Method, Receiving Method, and Program,'' 4214237(Japan), 14 November 2008.
• Chang-Jun Ahn, and Hiroshi Harada, ``Communication System, Transmitter, Receiver, Transmitting Method, Receiving Method, and Program,'' 10/585959 (USA), 30 October 2008.
• Satoshi Takahashi, Chang-Jun Ahn, and Hiroshi Harada, ``Receiver, Receivung Method, Program, and Information Recording Medium,'' 11/817625 (USA), 19 September 2008.
• Chang-Jun Ahn, Satoshi Takahashi, Hisato Fujisaka, Takeshi Kamio, and Kazuhisa Haeiwa, ``OFDM Transmitter Apparatus, and System,'' 2008-092622 (Japan), 31 March 2008.
• Hiroshi Harada, Chang-Jun Ahn, Satoshi Takahashi, Yukiyoshi Kamio and Seichi Sampei, ``Communicating System, Communicating Mehtod, Base Station, and Mobile Station,'' 7436809 (USA), 25 March 2008.
• Chang-Jun Ahn, ``Transmitter Apparatus, Receiver Apparatus, Tranmitting Method, Receiving Method, and Program,'' 10-0774825 (Korea), 01 Nov. 2007.
• Hiroshi Harada, Chang-Jun Ahn, Satoshi Takahashi, and Yukiyoshi Kamio, ``Transmitter Apparatus, Receiver Apparatus, Tranmitting Method, Receiving Method, and Program,'' 4022625 (Japan),12 October, 2007.
• Chang-Jun Ahn, and Makoto Taromaru, ``Communications Systems,'' 2007-004316 (Japan), 12 January, 2007.
• Kazuto Yano, Chang-Jun Ahn, and Makoto Taromaru, ``Adaptive Array Antenna Receiver Apparatus,'' 2006-241324 (Japan), 06 Sept., 2006.
• Chang-Jun Ahn, ``Transmitter Apparatus, Receiver Apparatus, Tranmitting Method, Receiving Method, and Program,'' PCT/JP2005/13331 (Korea, Japan, EU, and USA), 2005.
• Chang-Jun Ahn, ``Transmitter Apparatus, Receiver Apparatus, Tranmitting Method, Receiving Method, and Program,'' 2005-132284 (Japan), 2005.
• Chang-Jun Ahn, ``Transmitter Apparatus, Receiver Apparatus, Tranmitting Method, Receiving Method, and Program,'' PCT/JP2005/03534 (Korea, Japan, EU, and USA), 2005.
• Chang-Jun Ahn, ``Transmitter Apparatus, Receiver Apparatus, Tranmitting Method, Receiving Method, and Program,'' PCT/JP2004/09192 (Korea, Japan, EU, and USA), 2004.
• Chang-Jun Ahn, ``Transmitter Apparatus, Receiver Apparatus, Tranmitting Method, Receiving Method, and Program,'' PCT/JP2004/00171 (Korea, Japan, EU, and USA), 2004.
• Chang-Jun Ahn, ``Transmitter Apparatus, Receiver Apparatus, Tranmitting Method, Receiving Method, and Program,'' PCT/JP2004/00174 (Korea, Japan, EU, and USA), 2004.
• Chang-Jun Ahn, ``Transmitter Apparatus, Receiver Apparatus, Tranmitting Method, Receiving Method, and Program,'' PCT/JP2003/16275 (Korea, Japan, EU, and USA), 2003.
• Chang-Jun Ahn, ``Transmitter Apparatus, Receiver Apparatus, Tranmitting Method, Receiving Method, and Program,'' PCT/JP2003/11110 (Korea, Japan, EU, and USA), 2003.

受賞

• IEEE ICEIC2024 Best Paper Award, 2024年1月30日.
• IEEE ISAAC 2023 Best Paper Award, 2023年11月19日.
• IEEE ICCE-Asia2022 Best Paper Award, 2022年10月27日.
• IEICE Communications Express (ComEX) Top Downloaded Letter Award　2021年06月23日
• Journal of Signal Processing Best Paper Award 2021年03月
• IEICE ICETC2020 Best Paper Award 2020年12月
• IEEE APCC2019 Best Paper Award, 2019年11月6日.
• IEEE SoftCOM2018 Best Paper Award, 2018年11月28日.
• 電子情報通信学会 通信方式研究会奨励賞, 2012年07月12日.
• 広島市功労賞, 2010年03月31日.
• 電子情報通信学会2010年度総合大会 優秀ポスター賞, 2010年03月17日.
• 第60回電気・情報関連学会中国支部連合大会 電子情報通信学会中国支部奨励賞, 2010年01月.
• 船井情報科学財団, 船井情報科学奨励賞, 2003年3月27日.
• 韓国國防省長官表彰, 1998年10月1日.

研究助成

財団など外部資金(代表)

• 財団法人電気通信普及財団 研究調査助成, 「無人航空機型基地局(ドローン基地局)におけるエネルギー源の開発とその応用」, 平成31年度
• JST 日本・アジア青少年サイエンス交流事業（さくらサイエンスプラン）「無線伝送技術と人工知能に関する最先端科学技術体験」, 課題番号：S2018F0829512, 平成30年度
• 千葉大学国際交流公募事業，「海外との組織的教育研究交流支援プログラム」, 平成29年度
• 科学研究費補助金 基盤研究(C)，「大規模通信系における通信容量の拡大と性能向上に関する研究とその応用」, 課題番号：17K06415, 平成29-31年度
• 科学研究費補助金 基盤研究(C)，「ユビキタス情報技術における新しいエネルギー源の開発とその応用」, 課題番号：26420339, 平成26-28年度
• 財団法人放送文化基金 研究助成金, 「放送波ホワイトスペース通信への応用を目指す高周波可変フィルタとデジタル補償法の研究開発」, 平成26年度
• 財団法人電気通信普及財団 研究調査助成, 「ユビキタス情報技術における新しいエネルギー源の開発とその応用」, 平成26年度
• 千葉大学研究支援事業，「近距離ミリ波帯無線アクセスとホワイトスペース等の技術への応用を目指したアナログRF回路の不完全性から起因する非線形歪み補償法の研究開発」, 平成25年度
• 千葉大学国際交流公募事業，「交流協定校との海外学修プログラム」, 平成24年度
• 科学研究費補助金 若手研究(B)，「無線信号を利用した高効率エネルギーハーベスティング技術の研究開発」, 課題番号：22710079, 平成22-23年度
• 財団法人電気通信普及財団 研究調査助成, 「小型無線機器のための高効率エネルギーハーベスティング技術の研究開発」, 平成22年度
• 財団法人スズキ財団 科学技術研究助成金, 「高効率マイクロ波無線電力伝送に関する研究・開発」, 平成22年度
• JST 重点地域研究開発推進プログラム（シーズ発掘試験） 「低消費電力で超高速・長距離伝送が可能な光OFDMシステムの開発」, 課題番号：12-095,平成21年度
• 広島市立大学特定研究費, 「超高速無線通信システムの研究開発」, 平成20-22年度
• 電子部品研究院委託研究 「低演算量MIMO信号剣出方法に関する研究」, 平成19年度.
• 情報通信研究機構理事長ファンドインセンティブ研究, 「電力線通信システムにおける耐ノイズ、耐干渉に関する研究」, 平成17年度.
• 慶應義塾先端科学技術研究センター研究助成金, 「適応変調技術に関する研究開発」, 平成14年度
• 財団法人国際コミュニケーション基金研究助成, 「新世代移動通信システム実現に関する研究」, 平成14年度.
• 慶應義塾先端科学技術研究センター研究助成金, 「高速誤り訂正符号に関する研究」, 平成13年度

財団など外部資金(分担)

• 科学研究費補助金 挑戦的萌芽研究，「広域可変高周波フロントエンドの開発：コグニティブ無線機実現に向けた挑戦」, 課題番号：11015153, 平成23-24年度
• 広島市立大学特定研究費, 「地上ディジタル放送用10GHz帯高感度変調器」, 平成20年度
• 広島市立大学特定研究費, 「UWBレーダの研究開発」, 平成19年度
• 戦略的情報通信研究開発推進制度(SCOPE) 「モバイルアドホックネットワークにおけるスケーラブルグループメンバー確認技術に関する研究開発」, 平成19年度
• 総務省研究案件, 「空間軸上周波数有効利用技術の研究開発」, 平成18-19年度.
• 情報通信研究機構委託研究, 「超高速ギガビット無線LANの研究開発」, 平成18-19年度.
• 総務省研究案件, 「耐フェーシング装置関連研究」, 平成16-17年度.
• NTTドコモ委託研究 「第４世代移動体通信システムの研究開発」, 平成12-14年度.

海外渡航助成

• 公益財団法人 スズキ財団の研究者海外研修助成, 平成27年度.
• 千葉大学若手教職員国際研究集会等派遣支援プログラム、平成23年度
• 広島市立大学研究費 海外渡航旅費助成, 平成20年度.
• 財団法人NEC C&C財団 海外渡航旅費助成, 平成20年度.
• 電気通信普及財団 海外渡航旅費助成,平成20年度.
• 原総合通信システム基金 海外渡航旅費助成, 平成17年度.
• 電気通信普及財団 海外渡航旅費助成, 平成17年度.
• NTTドコモ国際会議発表援助金, 平成15年度.
• 財団法人慶応工学会国際交流援助費, 平成14年度.
• NTTドコモ国際会議発表援助金, 平成14年度.