Chang-Jun Ahn

Publication Activity (10 Years)

Years Active: 2002-2024
Publications (10 Years): 54

Top Venues

WPMC

ISPACS

ICT Express

IEICE Trans. Fundam. Electron. Commun. Comput. Sci.

Publications

Jun-Han Wang, He He, Kosuke Tamura, Shun Kojima, Jaesang Cha, Chang-Jun Ahn
Vehicle-to-Vehicle Communication Channel Estimator Based on Gate Recurrent Unit. ICEIC (2024)
Koji Nishibe, Takanori Shibakura, Koki Miyamoto, Jaesang Cha, Chang-Jun Ahn
Efficient Joint Estimation Methods of Channel and IQ Imbalance for MIMO-OFDM Systems. ICEIC (2024)
He He, Shun Kojima, Kazuki Maruta, Chang-Jun Ahn
Adaptive Zero-Padding with Impulsive Training Signal MMSE-SMI Adaptive Array Interference Suppression. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. 106 (4) (2023)
Hiroaki Kobayashi, Shun Kojima, Kazuki Maruta, Takatoshi Sugiyama, Chang-Jun Ahn
CNN-based blind SIR classification framework for STPA-BAA spectrum superposing. ICT Express 9 (1) (2023)
Shun Kojima, Yuta Goto, Kazuki Maruta, Shinya Sugiura, Chang-Jun Ahn
Timing Synchronization Based on Supervised Learning of Spectrogram for OFDM Systems. IEEE Trans. Cogn. Commun. Netw. 9 (5) (2023)
Shun Kojima, Yi Feng, Kazuki Maruta, Kanemitsu Ootsu, Takashi Yokota, Chang-Jun Ahn, Vahid Tarokh
Towards Deep Learning-Guided Multiuser SNR and Doppler Shift Detection for Next-Generation Wireless Systems. VTC Spring (2022)
Sudhanshu Arya, Yeon Ho Chung, Chang-Jun Ahn
Game Theoretic Framework for Beamforming Optimization for Photon-Counting Multiuser MISO Channel with Asymptotic Low Power. ICC Workshops (2022)
Shun Kojima, He He, Takaki Omura, Kazuki Maruta, Chang-Jun Ahn
Generalized Regression Neural Network Based Fast Fading Channel Tracking Using Frequency-Domain CSI Smoothing. IEEE Access 9 (2021)
Kakeru Matsubara, Shun Kuroki, Koki Ito, Kazushi Shimada, Kazuki Maruta, Chang-Jun Ahn
Pilot De-Contamination by Modified HTRCI with Time-Domain CSI Separation for Two-Cell MIMO Downlink. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (9) (2021)
Shun Kojima, Yi Feng, Kazuki Maruta, Kanemitsu Ootsu, Takashi Yokota, Chang-Jun Ahn, Vahid Tarokh
Investigation of Input Signal Representation to CNN for Improving SNR Classification Accuracy. VTC Fall (2021)
Shun Kojima, Kazuki Maruta, Yi Feng, Chang-Jun Ahn, Vahid Tarokh
CNN-Based Joint SNR and Doppler Shift Classification Using Spectrogram Images for Adaptive Modulation and Coding. IEEE Trans. Commun. 69 (8) (2021)
Kazuki Maruta, Chang-Jun Ahn
Multi Modulus Signal Adaptation for Semi-Blind Uplink Interference Suppression on Multicell Massive MIMO Systems. IEICE Trans. Commun. (2) (2021)
Taiga Mano, Chang-Jun Ahn
Joint Polar Code and Trellis Coded Modulation with Known Bits Puncturing. ISPACS (2021)
Kosuke Shima, Shun Kojima, Koki Ito, Kazuki Maruta, Chang-Jun Ahn
Adaptive Subcarrier Grouping for MMSE-SMI Adaptive Array Interference Suppression. IEEE Access 9 (2021)
Nobutaka Funaki, Kazuki Maruta, Chang-Jun Ahn
Dimensionality reduction of interference subspace for multiuser massive MIMO null-space expansion. Digit. Signal Process. 114 (2021)
Kosuke Shima, Kazuki Maruta, Chang-Jun Ahn
Data-Aided SMI Algorithm Using Common Correlation Matrix for Adaptive Array Interference Suppression. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (2) (2021)
Koki Yanashita, Kazushi Shimada, Seiya Hirano, Chang-Jun Ahn
Optimum Assignment of Variable Code Length and Modulation Index for VLC-OFDM. ISPACS (2021)
Yuta Toyama, Shun Kojima, Chang-Jun Ahn
Performance Enhancement of Low Granularity MIMO-OFDMA Using FSS Method. ISPACS (2021)
Shun Kojima, Kazuki Maruta, Chang-Jun Ahn
High-precision SNR Estimation by CNN using PSD Image for Adaptive Modulation and Coding. VTC Spring (2020)
Kabuto Arai, Kazuki Maruta, Chang-Jun Ahn
High Beamforming Gain Precoding Weight Design Scheme with Null-Space Expansion for Multiuser Massive MIMO in Time-Varying Channels. WPMC (2020)
Seiya Hirano, Kazushi Shimada, Shun Kojima, Kazuki Maruta, Chang-Jun Ahn
Reducing FBI and MLI Using FSS Method for Adaptive Modulated VLC-OFDM System. WPMC (2020)
Kabuto Arai, Kazuki Maruta, Chang-Jun Ahn
Uplink Null-Space Expansion for Multiuser Massive MIMO in Time-Varying Channels Under Unknown Interference. IEEE Access 8 (2020)
Hiroaki Kobayashi, Kazuki Maruta, Takatoshi Sugiyama, Chang-Jun Ahn
Computationally Efficient SLM based PAPR Reduction for STPA-BAA Scheme. WPMC (2020)
Kazuki Maruta, Shun Kojima, Chang-Jun Ahn, Daisuke Hisano, Yu Nakayama
Blind SIR Estimation by Convolutional Neural Network Using Visualized IQ Constellation. VTC Spring (2020)
Kentaro Yonei, Kazuki Maruta, Chang-Jun Ahn
Frame splitting and data-aided decision direct channel estimation for OFDM in fast varying fading channels. ICT Express 6 (3) (2020)
Nobutaka Funaki, Kazuki Maruta, Chang-Jun Ahn
Improved Null-Space Expansion Scheme under Presence of Channel Estimation Error for Multiuser Massive MIMO. WPMC (2020)
Toshiya Hanada, Chang-Jun Ahn, Kazuki Maruta
Improving DOA Estimation Accuracy by Rotating Planar Array Antenna. WPMC (2020)
Naoya Tanuma, Ryo Marumo, Kazuki Maruta, Chang-Jun Ahn
Known Bits Puncturing for Systematic Polar Codes. APCC (2019)
Shun Kojima, Kazuki Maruta, Chang-Jun Ahn
Adaptive Modulation and Coding Using Neural Network Based SNR Estimation. IEEE Access 7 (2019)
Kazushi Shimada, Mitsuki Takahashi, Kazuki Maruta, Chang-Jun Ahn
Channel Ranking based Spread Code Optimization for Visible Light Communication OFDM-IDMA Systems. APCC (2019)
Kouichi Motosugi, Kentaro Yonei, Kazuki Maruta, Chang-Jun Ahn
Fast Fading Compensation by Frame Splitting and Decision Directed Channel Extrapolation for OFDM. APCC (2019)
Kosuke Shima, Katsuya Senoo, Kenta Goto, Kazuki Maruta, Chang-Jun Ahn
Data-aided SMI Algorithm using Common Correlation Matrix for Adaptive Array Interference Suppression. APCC (2019)
Satoshi Taroda, Ken Tezuka, Shoichi Higuchi, Chang-Jun Ahn, Kazuki Maruta
Transmit power imbalance reduction method and nonlinear companding transform for beamforming OFDM systems. ICT Express 5 (4) (2019)
Kazuki Maruta, Chang-Jun Ahn
Enhanced Semi-Blind Uplink Interference Suppression on Multicell Massive MIMO Systems for Multi Modulus Signals. VTC Fall (2019)
Takashi Akao, Koya Watanabe, Shun Kojima, Masato Katsuno, Kazuki Maruta, Chang-Jun Ahn
Reducing channel spatial correlation by rotating planar antenna array. ICT Express 5 (4) (2019)
Koki Ito, Kazuki Maruta, Chang-Jun Ahn
Outage Probability Analysis of MF Precoded Massive MIMO with Multi-antenna User Environment. APCC (2019)
Koya Watanabe, Shun Kojima, Takashi Akao, Masato Katsuno, Kazuki Maruta, Chang-Jun Ahn
Modified pilot selection for channel estimation of systematic polar coded MIMO-OFDM. ICT Express 5 (4) (2019)
Kakeru Matsubara, Shun Kuroki, Kazuki Maruta, Chang-Jun Ahn
Modified HTRCI with Time-domain CSI Separation for Pilot De-contamination. APCC (2019)
Kazuki Maruta, Chang-Jun Ahn
Improving Semi-Blind Uplink Interference Suppression on Multicell Massive MIMO Systems: A Beamspace Approach. IEICE Trans. Commun. (8) (2019)
Shun Kojima, Takashi Akao, Koya Watanabe, Masato Katsuno, Kazuki Maruta, Chang-Jun Ahn
Adaptive Switching Method with AMC and FSS. SoftCOM (2018)
Kazuki Maruta, Chang-Jun Ahn
Uplink Interference Suppression by Semi-Blind Adaptive Array With Decision Feedback Channel Estimation on Multicell Massive MIMO Systems. IEEE Trans. Commun. 66 (12) (2018)
Koya Watanabe, Shun Kojima, Takashi Akao, Masato Katsuno, Kazuki Maruta, Chang-Jun Ahn
Modified Pilot Selection for Systematic Polar Coded MIMO-OFDM Channel Estimation. ISPACS (2018)
Kazuki Maruta, Yu Nakayama, Kazuaki Honda, Daisuke Hisano, Chang-Jun Ahn
V2P Connectivity on Higher Frequency Band and CoMP Based Coverage Expansion. PIMRC (2018)
Takashi Akao, Koya Watanabe, Shun Kojima, Masato Katsuno, Kazuki Maruta, Chang-Jun Ahn
Reducing Channel Spatial Correlation by Rotating Planar Antenna Array. ISPACS (2018)
Shoichi Higuchi, Chang-Jun Ahn
Reduced complexity and latency for a massive MIMO system using a parallel detection algorithm. ICT Express 3 (3) (2017)
Takashi Akao, Satoshi Taroda, Kazuki Maruta, Chang-Jun Ahn
Improved common correlation matrix based SMI algorithm by channel estimation error minimization with LMS approach. WPMC (2017)
Masato Katsuno, Shoichi Higuchi, Kazuki Maruta, Chang-Jun Ahn
Improving scattered pilot channel estimation by sector selection on FDD MIMO/OFDM systems. WPMC (2017)
Wenjian Wang, Ye Tian, 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. Digit. Signal Process. 62 (2017)
Koya Watanabe, Shoichi Higuchi, Kazuki Maruta, Chang-Jun Ahn
Performance of polar codes with MIMO-OFDM under frequency selective fading channel. WPMC (2017)
Shun Kojima, Ken Teduka, Kazuki Maruta, Chang-Jun Ahn
Optimized adaptive modulation with considering mobile relay on FSS-OFDM system. WPMC (2017)
Ye Tian, Daito Shigaki, Wenjian Wang, Chang-Jun Ahn
A weighted least-squares method using received signal strength measurements for WLAN indoor positioning system. WPMC (2017)
Fumiaki Ukaji, Chang-Jun Ahn, Tatsuya Omori, Ken-ya Hashimoto
Performance enhancement with applying FSS and ASB method for MU-MIMO. ICIT (2016)
Chang-Jun Ahn
An applicable 5.8 GHz wireless power transmission system with rough beamforming to Project Loon. ICT Express 2 (2) (2016)
Atul Sewaiwar, Samrat Vikramaditya Tiwari, Yeon-ho Chung, Chang-Jun Ahn
Color cell based bidirectional VLC with user mobility. ICC Workshops (2016)
Hisato Fujisaka, Takeshi Kamio, Chang-Jun Ahn, Masahiro Sakamoto, Kazuhisa Haeiwa
A Sigma-Delta Domain Lowpass Wave Filter. IEEE Trans. Circuits Syst. I Regul. Pap. (1) (2015)
Yuta Ida, Masanori Yofune, Chang-Jun Ahn, Takahiro Matsumoto, Shinya Matsufuji
Estimation based on weighted channel variance for HTRCI-MIMO/OFDM with QRM-MLD and channel ranking under fast fading Channel. Trans. Emerg. Telecommun. Technol. 26 (7) (2015)
Masaya Okamura, Chang-Jun Ahn, Tatsuya Omori, Ken-ya Hashimoto
Channel compensation based on VPS and time-frequency interferometry for massive MIMO-OFDM. ISPACS (2015)
Hikaru Oka, Chang-Jun Ahn, Tatsuya Omori, Ken-ya Hashimoto
IQ imbalance estimation and compensation schemes based on time-frequency interferometry for OFDM. Trans. Emerg. Telecommun. Technol. 26 (9) (2015)
Yuta Ida, Chang-Jun Ahn, Takahiro Matsumoto, Shinya Matsufuji
Achievement Accurate CSI for AF Relay MIMO/OFDM Based on Complex HTRCI Pilot Signal with Enhanced MMSE Equalization. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (11) (2015)
Wenjian Wang, Ye Tian, Chang-Jun Ahn
A novel time synchronization scheme for OFDM systems based on variational Pseudo-noise preamble. APSITT (2015)
Asato Kuriharat, Chang-Jun Ahn, Tatsuya Omori, Ken-ya Hashimoto
An application of OFDM-IDMA to uplink multiuser visible light communication system. ISPACS (2015)
Kotaro Abe, Chang-Jun Ahn, Tatsuya Omori, Ken-ya Hashimoto
Spatial performance of color clustered VLC-MIMO due to incompleteness of color filters. ISPACS (2015)
Ye Tian, Wenjian Wang, Chang-Jun Ahn, Tatsuya Omori, Ken-ya Hashimoto
The accuracy improvement using WLAN for indoor positioning system. ISPACS (2015)
Hikaru Oka, Chang-Jun Ahn, Tatsuya Omori, Ken-ya Hashimoto
IQ imbalance and carrier frequency offset compensation schemes for TFI-OFDM. ISPACS (2014)
Akihiro Kuroha, Chang-Jun Ahn, Tatsuya Omori, Ken-ya Hashimoto
Multiuser Diversity OFDMA using Power Priority Selection and Adaptive Clipping. Int. J. Distributed Syst. Technol. 5 (4) (2014)
Yuta Ida, Chang-Jun Ahn, Takahiro Matsumoto, Shinya Matsufuji
Removing Deep Faded Subcarrier Channel for Cooperative Multiuser Diversity OFDMA Based on Low Granularity Block. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (12) (2014)
Chang-Jun Ahn, Incheol Jeong, Izumi Endo, Tatsuya Omori, Ken-ya Hashimoto
Maritime VHF communications with polarization diversity over a Rician channel. Int. J. Commun. Syst. 27 (10) (2014)
Taichi Sakaue, Chang-Jun Ahn, Tatsuya Omori, Ken-ya Hashimoto
Time Domain Replica Signal Based Interference Compensation for SP-MIMO/OFDM with Large Delay Spread Channel. Int. J. Distributed Syst. Technol. 5 (4) (2014)
Naotoshi Yoda, Chang-Jun Ahn, Ken-ya Hashimoto
Single Symbol Decodable QO-STBC with Full Diversity. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (1) (2014)
Akihiro Kuroha, Chang-Jun Ahn, Tatsuya Omori, Ken-ya Hashimoto
Power priority selection and adaptive clipping with peak reduction signal for MUDiv/OFDMA. RIVF (2013)
Naotoshi Yoda, Wenjian Wang, Chang-Jun Ahn
Single symbol decodable QO-STBC with full diversity. ICSPCS (2013)
Kei Okubo, Chang-Jun Ahn, Tatsuya Omori, Ken-ya Hashimoto
Enhancement of cell-edge throughput performance with CoMP transmission using QO-STBC scheme. GCCE (2013)
Masayuki Kitakatay, Chang-Jun Ahn, Tatsuya Omori, Ken-ya Hashimoto
Throughput performance enhancement applying adaptive modulation for single symbol decodable QO-STBC with full diversity. APCC (2013)
Yuta Ida, Chang-Jun Ahn, Takahiro Matsumoto, Shinya Matsufuji
Mitigated deep faded channel with relay node allocation for MUDiv/OFDMA. APCC (2013)
Yuta Ida, Masanori Yofune, Chang-Jun Ahn, Takahiro Matsumoto, Shinya Matsufuji
Non-linear fast fading compensation for HTRCI-MIMO/OFDM with QRM-MLD and channel ranking. IWSDA (2013)
Hikaru Oka, Chang-Jun Ahn, Tatsuya Omori, Ken-ya Hashimoto
IQ imbalance estimation and compensation schemes based on time frequency interferometry for OFDM. IWSDA (2013)
Yuta Ida, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka, Kazuhisa Haeiwa
Variable packet splitting transmission in multi-relay cooperative communications with DF and DAF for SC-FDMA. EURASIP J. Wirel. Commun. Netw. 2013 (2013)
Taichi Sakaue, Tomoki Yoshimura, Yuta Ida, Chang-Jun Ahn, Tatsuya Omori, Ken-ya Hashimoto
Interference compensation scheme using time domain replica signals for SP-MIMO/OFDM under large delay spread channel greater than GI. RIVF (2013)
Chang-Jun Ahn, Dongsoo Har, Tatsuya Omori, Ken-ya Hashimoto
Frequency symbol spreading based adaptive subcarrier block selection for OFDMA system. Digit. Signal Process. 22 (3) (2012)
Hisato Fujisaka, Masahiro Sakamoto, Chang-Jun Ahn, Takeshi Kamio, Kazuhisa Haeiwa
Sorter-Based Arithmetic Circuits for Sigma-Delta Domain Signal Processing - Part II: Multiplication and Algebraic Functions. IEEE Trans. Circuits Syst. I Regul. Pap. (9) (2012)
Chang-Jun Ahn, Ken-ya Hashimoto
Heterogeneous Constellation Based QOSTBC for Improving Detection Property of QRD-MLD. IEICE Trans. Commun. (8) (2012)
Chang-Jun Ahn, Tatsuya Omori, Ken-ya Hashimoto
Heterogeneous constellation based QOSTBC for improving property of QRD-MLD. ICCE (2012)
Hisato Fujisaka, Takeshi Kamio, Chang-Jun Ahn, Masahiro Sakamoto, Kazuhisa Haeiwa
Sorter-Based Arithmetic Circuits for Sigma-Delta Domain Signal Processing - Part I: Addition, Approximate Transcendental Functions, and Log-Domain Operations. IEEE Trans. Circuits Syst. I Regul. Pap. (9) (2012)
Yuta Ida, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka, Kazuhisa Haeiwa
Interference Cancellation Using Replica Signal for HTRCI-MIMO/OFDM in Time-Variant Large Delay Spread Longer Than Guard Interval. J. Electr. Comput. Eng. 2012 (2012)
Hyunju Kim, Eonpyo Hong, Chang-Jun Ahn, Dongsoo Har
Efficient phase sequence generation for SLM scheme without side information. IEICE Electron. Express 8 (17) (2011)
Hyunju Kim, Eonpyo Hong, Chang-Jun Ahn, Dong-Soo Har
A Pilot Symbol Pattern Enabling Data Recovery Without Side Information in PTS-Based OFDM Systems. IEEE Trans. Broadcast. 57 (2) (2011)
Chang-Jun Ahn
Achievable throughput enhancement based on modified carrier interferometry for MIMO/OFDM. Digit. Signal Process. 20 (5) (2010)
Chang-Jun Ahn
HTRCI and Channel Ranking Based Joint Symbols Detection for MQRD-PCM/MIMO-OFDM. Wirel. Pers. Commun. 55 (4) (2010)
Yasuhiro Okada, Hisato Fujisaka, Takeshi Kamio, Chang-Jun Ahn, Kazuhisa Haeiwa
Ising spin-grass error correction for unreliable nanoelectronic logic circuits. ECCTD (2009)
Takeshi Yoshimura, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka, Kazuhisa Haeiwa
Performance enhancement of TFI-OFDM with path selection based channel identification. Digit. Signal Process. 19 (5) (2009)
Takashi Yasuno, Yoshinao Suzuki, Hisato Fujisaka, Takeshi Kamio, Chang-Jun Ahn, Kazuhisa Haeiwa
A single-eletron bandpass digital wave filter. ECCTD (2009)
Chang-Jun Ahn
Channel Ranking Based Joint Symbols Detection for MQRD-PCM/MIMO-OFDM. CCNC (2009)
Chang-Jun Ahn
Performance Enhancement of MQRD-PCM/MIMO-OFDM Using Channel Ranking Based Joint Symbols Detection. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (8) (2009)
Chang-Jun Ahn
Link Correlation Based Transmit Sector Antenna Selection for Alamouti Coded OFDM. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (3) (2009)
Chang-Jun Ahn
Parallel detection algorithm using multiple QR decompositions with permuted channel matrix for SDM/OFDM. ISWPC (2008)
Chang-Jun Ahn
Throughput Improvement with Discrete Pilot Signal Assignment and Iterative Channel Identification for MQRD-PCM/OFDM. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (8) (2008)
Chang-Jun Ahn
High Time Resolution Carrier Interferometry for MIMO/OFDM. CCNC (2008)
Chang-Jun Ahn
Parallel Detection Algorithm Using Multiple QR Decompositions With Permuted Channel Matrix for SDM/OFDM. IEEE Trans. Veh. Technol. 57 (4) (2008)
Takeshi Kamio, Kenji Mori, Kunihiko Mitsubori, Chang-Jun Ahn, Hisato Fujisaka, Kazuhisa Haeiwa
Fuzzy ARTMAP with Explicit and Implicit Weights. ICONIP (1) (2007)
Chang-Jun Ahn
Accurate Channel Identification with Time-Frequency Interferometry for OFDM. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (11) (2007)

Chang-Jun Ahn.css-eqlu8i{font-size:small;padding-left:4px;}

Publication Activity (10 Years)

Top Topics

Top Venues

Chang-Jun Ahn