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 Access, vol. 13, pp. 12332‑12342, Jan. 2025.
DOI: 10.1109/ACCESS.2025.3529768
Kosuke Tamura, Shun Kojima*, Phuc V. Trinh, Shinya Sugiura, and Chang‑Jun Ahn,
"Joint SNR and Rician K‑Factor Estimation Using Multimodal Network over Mobile Fading Channels,"
IEEE Transactions on Machine Learning in Communications and Networking, vol. 2, pp. 766‑779, Jun. 2024.
DOI: 10.1109/TMLCN.2024.3412054
Shun Kojima and Shinya Sugiura,
"Random pilot activation and interpolated channel estimation for physical‑layer secret key generation in correlated eavesdropping channel,"
IEEE Transactions on Vehicular Technology, vol. 73, no. 9, pp. 12978‑12990, Sept. 2024.
DOI: 10.1109/TVT.2024.3386597
Shun Kojima and Shinya Sugiura,
"User‑independent randomized pilot activation for secure key generation,"
IEEE Transactions on Wireless Communications, vol. 23, no. 9, pp. 11624‑11635, Sept. 2024.
DOI: 10.1109/TWC.2024.3383868
Takashi Yokota, Kanemitsu Ootsu, Shun Kojima,
"Enhancing Cup‑Stacking Method for Collective Communication,"
IEICE Transactions on Information and Systems, vol. E106‑D, no. 11, pp. 1808‑1821, Nov. 2023.
DOI: 10.1587/transinf.2022EDP7179
Yuta Matsuzaki, Shun Kojima, and Shinya Sugiura,
"Deep‑Learning‑Based Physical‑Layer Lightweight Authentication in Frequency‑Division Duplex Channel,"
IEEE Communications Letters, vol. 27, no. 8, pp. 1969‑1973, Jun. 2023.
DOI: 10.1109/LCOMM.2023.3286043
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, Oct. 2023.
DOI: 10.1109/TCCN.2023.3280159
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,"
Journal of Signal Processing, vol. 27, no. 3, pp. 49‑57, May 2023.
DOI: 10.2299/jsp.27.49
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. 343‑449, Dec. 2022.
DOI: 10.24138/jcomss-2022-0109
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 of Electronics, Communications and Computer Sciences,
vol. E106‑A, no. 4, pp. 674‑682, Apr. 2023.
DOI: 10.1587/transfun.2022eap1070
Takashi Yokota, Kanemitsu Ootsu, and Shun Kojima,
"On a Cup‑Stacking Concept in Repetitive Collective Communication,"
IEICE Transactions on Information and Systems, vol. E105‑D, no. 7, pp. 1325‑1329, Jul. 2022.
DOI: 10.1587/transinf.2021EDL8098
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, Feb. 2023.
DOI: 10.1016/j.icte.2021.12.009
Shun Kojima*, He He, Takaki Omura, Kazuki Maruta, and Chang‑Jun Ahn,
"Generalized Regression Neural Network based Fast Fading Channel Tracking using Frequency‑Domain CSI Smoothing,"
IEEE Access, vol. 9, pp. 142425‑142436, Oct. 2021.
DOI: 10.1109/ACCESS.2021.3121399
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, Oct. 2021.
DOI: 10.13164/re.2021.0695
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, Aug. 2021.
DOI: 10.1587/comex.2021XBL0145
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, May 2021.
DOI: 10.1109/TCOMM.2021.3077565
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, Jan. 2021.
DOI: 10.1109/ACCESS.2021.3053989
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, 2019.
DOI: 10.1109/ACCESS.2019.2946973
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. 416‑421, Jul. 2019.
DOI: 10.1587/comex.2019XBL0095
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, Dec. 2019.
DOI: 10.1016/j.icte.2019.03.002
Shun Kojima*, Koya Watanabe, Kazuki Maruta, and Chang‑Jun Ahn,
"Joint Adaptive Modulation and Transmit Power Control on Frequency Symbol Spreading OFDM Mobile Relay System,"
Journal of Signal Processing, vol. 23, no. 3, pp. 83‑93, May 2019.
DOI: 10.2299/jsp.23.83
Shun Kojima*, 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, Nov. 2018.
DOI: 10.24138/jcomss.v14i4.616
International Conference Papers
Shun Kojima and Shinya Sugiura,
“Group Secret Key Distribution Based on Physical‑Layer Key Generation and NOMA‑Assisted Downlink,”
Proc. 2025 IEEE International Conference on Communications Workshops (ICC Workshops),
Montréal, Canada, 2025, pp. 1‑6. (to be presented)
Jun‑han Wang, He He, Kosuke Tamura, Shun Kojima,
Jaesang Cha, and Chang‑Jun Ahn,
“Optimization of Vehicular Network Resource Allocation Based on MAAC Algorithm,”
Proc. Asia‑Pacific Conference on Communication 2024 (APCC 2024),
Bali, Indonesia, Nov. 2024, pp. 1‑7.
DOI: 10.1109/APCC62576.2024.10767962
Kosuke Tamura, Shun Kojima, Shinya Sugiura, Jaesang Cha, and Chang‑Jun Ahn,
“Accurate and Doppler Robust SNR Estimation using Multimodal CNN,”
Proc. IEEE 99th Vehicular Technology Conference (VTC 2024‑Spring),
Singapore, Jun. 2024, pp. 1‑5.
DOI: 10.1109/VTC2024-Spring62846.2024.10683240
Kazuki Maruta and Shun Kojima,
“Blind Array Algorithm Adaptation by CNN‑assisted SIR Estimation using IQ Constellation,”
Proc. ASPIRE Workshop 2024, Hiroshima, Japan, Mar. 2024.
DOI: 10.34385/proc.80.P-4
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 (ICEIC 2024),
Taipei, Taiwan, Jan. 2024.
DOI: 10.1109/ICEIC61013.2024.10457159[Best Paper Award Bronze Prize]
Kosuke Tamura, Shun Kojima, Kazuki Komatsu, and Chang‑Jun Ahn,
“Spectrally Efficient Frequency Division Multiplexing with QRM‑MLD for Rician Fading Channel,”
2023 International Conference on Advanced Technologies for Communications (ATC 2023),
Da Nang, Vietnam, Oct. 2023.
DOI: 10.1109/ATC58710.2023.10318920
Yuki Sasaki, Kazuki Maruta, Shun Kojima, Daisuke Hisano, and Yu Nakayama,
“Light Source Tracking System for A‑QL based Display‑Camera Communication,”
Proc. IEEE 97th Vehicular Technology Conference (VTC 2023‑Spring),
Florence, Italy, Jun. 2023, pp. 1‑6.
DOI: 10.1109/VTC2023-Spring57618.2023.10200481
Yuki Sasaki, Kazuki Maruta, Shun Kojima, Daisuke Hisano, and Yu Nakayama,
“Deep Learning based 2D Symbol Detection for Display‑Camera Communication,”
Proc. IEEE Consumer Communications & Networking Conference 2023 (CCNC 2023),
Las Vegas, NV, USA, Jan. 2023, pp. 1‑2.
DOI: 10.1109/CCNC51644.2023.10060131
He He, Jun‑Han Wang, Shun Kojima, Kazuki Maruta, and Chang‑Jun Ahn,
“Data‑aided weight with Subcarrier Grouping for Adaptive Array Interference Suppression,”
Proc. The Seventh International Conference on Consumer Electronics Asia 2022 (ICCE‑Asia 2022),
Yeosu, South Korea, Oct. 2022, pp. 1‑4.
DOI: 10.1109/ICCE-Asia57006.2022.9954703[Best Paper Award]
Tatsuya Tsuchiya, Kanemitsu Ootsu, Takashi Yokota, and Shun Kojima,
“Assembly code translation from ARM64 to RISC‑V,”
Proc. 23rd ACIS International Summer Virtual Conference on Software Engineering, Artificial Intelligence, Networking and Parallel/Distributed Computing (SNPD 2022‑Summer),
Kyoto, Japan, Jul. 2022, pp. 1‑5.
DOI: 10.1109/SNPD-Summer57817.2022.00020[Best Student Paper Award]
Jintaro Nogae, Kanemitsu Ootsu, Takashi Yokota, and Shun Kojima,
“Comparison of reinforcement learning in game AI,”
Proc. 23rd ACIS International Summer Virtual Conference on Software Engineering, Artificial Intelligence, Networking and Parallel/Distributed Computing (SNPD 2022‑Summer),
Kyoto, Japan, Jul. 2022, pp. 1‑5.
DOI: 10.1109/SNPD-Summer57817.2022.00022
Shun Kojima, Yi Feng, Kazuki Maruta, Kanemitsu Ootsu, Takashi Yokota, Chang‑Jun Ahn, and Vahid Tarokh,
“Towards Deep Learning‑Guided Multiuser SNR and Doppler Shift Detection for Next‑Generation Wireless Systems,”
Proc. IEEE 95th Vehicular Technology Conference (VTC 2022‑Spring),
Helsinki, Finland, Jun. 2022, pp. 1‑6.
DOI: 10.1109/VTC2022-Spring54318.2022.9860990
Yuta Toyama, Shun Kojima, and Chang‑Jun Ahn,
“Performance Enhancement of Low Granularity MIMO‑OFDMA Using FSS Method,”
Proc. 2021 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS 2021),
Virtual, Nov. 2021.
DOI: 10.1109/ISPACS51563.2021.9651133
He He, Shun Kojima, Kentaro Yonei, Kazuki Maruta, and Chang‑Jun Ahn,
“Variable Frame Splitting for Polar Coded MIMO E‑SDM in Fast Fading Channel,”
Proc. IEEE 94th Vehicular Technology Conference (VTC 2021‑Fall),
Virtual, Sept. 2021, pp. 1‑5.
DOI: 10.1109/VTC2021-Fall52928.2021.9625224
Shun Kojima, Yi Feng, Kazuki Maruta, Kanemitsu Ootsu, Takashi Yokota, Chang‑Jun Ahn, and Vahid Tarokh,
“Investigation of Input Signal Representation to CNN for Improving SNR Classification Accuracy,”
Proc. IEEE 94th Vehicular Technology Conference (VTC 2021‑Fall),
Virtual, Sept. 2021, pp. 1‑5.
DOI: 10.1109/VTC2021-Fall52928.2021.9625566
Yuta Goto, Shun Kojima, Kakeru Matsubara, Naoya Tanuma, Koki Ito, Kazuki Maruta, and Chang‑Jun Ahn,
“A Preamble‑less Symbol Timing Synchronization for OFDM Systems Using Convolutional Neural Networks,”
International Conference on Emerging Technologies for Communications (ICETC 2020),
Dec. 2020.
DOI: 10.34385/proc.63.I1-5
Yoto Namie, Shun Kojima, Kazuki Maruta, and Chang‑Jun Ahn,
“Convolutional Neural Network aided SNR Estimation Using IQ Constellation Images,”
International Conference on Emerging Technologies for Communications (ICETC 2020),
Dec. 2020.
DOI: 10.34385/proc.63.P1-5
He He, Shun Kojima, Kazuki Maruta, and Chang‑Jun Ahn,
“GRNN based Channel Estimation using Scattered Pilot and RBF Interpolation,”
International Conference on Emerging Technologies for Communications (ICETC 2020),
Dec. 2020.
DOI: 10.34385/proc.63.O1-2
Shun Kojima, Kosuke Shima, Kazuki Maruta, and Chang‑Jun Ahn,
“K‑Factor Estimation based on Spectrogram Images by Convolutional Neural Network,”
International Conference on Emerging Technologies for Communications (ICETC 2020),
Dec. 2020, pp. 1‑5.
DOI: 10.34385/proc.63.D3-2
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,”
The International Symposium on Wireless Personal Multimedia Communications (WPMC 2020),
Virtual, Oct. 2020, pp. 1‑5.
DOI: 10.1109/WPMC50192.2020.9309516
Kazuki Maruta, Shun Kojima, Chang‑Jun Ahn, Daisuke Hisano, and Yu Nakayama,
“Blind SIR Estimation by Convolutional Neural Network Using Visualized IQ Constellation,”
Proc. IEEE 91st Vehicular Technology Conference (VTC 2020‑Spring),
Virtual, May 2020, pp. 1‑2.
DOI: 10.1109/VTC2020-Spring48590.2020.9128719
Shun Kojima, Kazuki Maruta, and Chang‑Jun Ahn,
“High‑precision SNR Estimation by CNN using PSD image for Adaptive Modulation and Coding,”
Proc. IEEE 91st Vehicular Technology Conference (VTC 2020‑Spring),
Virtual, May 2020, pp. 1‑5.
DOI: 10.1109/VTC2020-Spring48590.2020.9129413 [Young Researcher's Encouragement Award]
Takashi Akao, Koya Watanabe, Shun Kojima, Masato Katsuno, Kazuki Maruta, and Chang‑Jun Ahn,
“Reducing Channel Spatial Correlation by Rotating Planar Antenna Array,”
Proc. The 2018 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS 2018),
Okinawa, Japan, Nov. 2018.
DOI: 10.1109/ISPACS.2018.8923368
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. The 2018 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS 2018),
Okinawa, Japan, Nov. 2018.
DOI: 10.1109/ISPACS.2018.8923173
Takaki Omura, Shun Kojima, Kazuki Maruta, and Chang‑Jun Ahn,
“Neural Network based Channel Identification and Compensation,”
Proc. The 18th International Symposium on Communications and Information Technologies (ISCIT 2018),
Bangkok, Thailand, Sept. 2018, pp. 349‑354.
DOI: 10.1109/ISCIT.2018.8587981
Shun Kojima, Takashi Akao, Koya Watanabe, Masato Katsuno, Kazuki Maruta, and Chang‑Jun Ahn,
“Adaptive Switching Method with AMC and FSS,”
Proc. The 26th International Conference on Software, Telecommunications and Computer Networks (SoftCOM 2018),
Split‑Supetar, Croatia, Sept. 2018, pp. 1‑6.
DOI: 10.23919/SOFTCOM.2018.8555762[Best Paper Award]
Shun Kojima, Ken Tezuka, Kazuki Maruta, and Chang‑Jun Ahn,
“Optimized Adaptive Modulation with Considering Mobile Relay on FSS‑OFDM System,”
Proc. The International Symposium on Wireless Personal Multimedia Communications (WPMC 2017),
Yogyakarta, Indonesia, Dec. 2017, pp. 41‑45.
DOI: 10.1109/WPMC.2017.8301847