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IEICE Trans

Koichi ISHIHARA

Centralized Control Method of Multi-Radio and Terminal Connection for 802.11 Wireless LAN Mixed Environment
Toshiro NAKAHIRA Koichi ISHIHARA Motoharu SASAKI Hirantha ABEYSEKERA Tomoki MURAKAMI Takatsune MORIYAMA Yasushi TAKATORI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2022/02/01
Vol. E105-B  No. 2  pp. 186-195
Type of Manuscript:  Special Section PAPER (Special Section on Emerging Communication Technologies in Conjunction with Main Topics of ICETC2020)
Category: 
Keyword: 
multi-radio control, terminal connection control, 802.11ax WLAN, spatial reuse, centralized control, 
 Summary | Full Text:PDF
Dynamic Terminal Connection Control Using Multi-Radio Unlicensed Access for 5G Evolution and Beyond
Toshiro NAKAHIRA Tomoki MURAKAMI Hirantha ABEYSEKERA Koichi ISHIHARA Motoharu SASAKI Takatsune MORIYAMA Yasushi TAKATORI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2021/09/01
Vol. E104-B  No. 9  pp. 1138-1146
Type of Manuscript:  Special Section PAPER (Special Section on Technology Trials and Proof-of-Concept Activities for 5G Evolution and Beyond)
Category: 
Keyword: 
multi-radio, terminal connection control, WLAN, spatial reuse, centralized control, 
 Summary | Full Text:PDF
Distributed Detection of MIMO Spatial Multiplexed Signals in Terminal Collaborated Reception
Fengning DU Hidekazu MURATA Mampei KASAI Toshiro NAKAHIRA Koichi ISHIHARA Motoharu SASAKI Takatsune MORIYAMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2021/07/01
Vol. E104-B  No. 7  pp. 884-892
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
multi-user MIMO, transmission experiment, interference cancellation, terminal collaboration, collaborative reception, measurement campaign, 
 Summary | Full Text:PDF
An Actual Stadium Verification of WLAN Using a Distributed Smart Antenna System (D-SAS)
Tomoki MURAKAMI Koichi ISHIHARA Hirantha ABEYSEKERA Yasushi TAKATORI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2021/01/01
Vol. E104-B  No. 1  pp. 109-117
Type of Manuscript:  PAPER
Category: Terrestrial Wireless Communication/Broadcasting Technologies
Keyword: 
WLAN, IEEE 802.11ac, distributed antenna system (DAS), smart antenna system (SAS), antenna switching, 
 Summary | Full Text:PDF
Dynamic Group-Based Antenna Selection for Uplink Multi-User MIMO in Distributed Antenna System
Sho YOSHIDA Kentaro NISHIMORI Soichi ITO Tomoki MURAKAMI Koichi ISHIHARA Yasushi TAKATORI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2018/07/01
Vol. E101-B  No. 7  pp. 1552-1560
Type of Manuscript:  Special Section PAPER (Special Section on Communication Quality in Wireless Networks)
Category: 
Keyword: 
multi-user multiple-input multiple-output (MU-MIMO), distributed antenna system (DAS), antenna selection, ray-tracing method, cable loss, 
 Summary | Full Text:PDF
CSI Feedback Reduction Method for Downlink Multiuser MIMO Transmission Using Dense Distributed Antenna Selection
Tomoki MURAKAMI Koichi ISHIHARA Yasushi TAKATORI Masato MIZOGUCHI Kentaro NISHIMORI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2018/02/01
Vol. E101-B  No. 2  pp. 426-433
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Antennas and Propagation in Conjunction with Main Topics of ISAP2016)
Category: MIMO
Keyword: 
multiuser multiple input multiple output (MU-MIMO), antenna selection, wireless LAN (WLAN), distributed antenna system (DAS), channel state information (CSI), 
 Summary | Full Text:PDF
Wide-Range and Fast-Tracking Non-Data-Aided Frequency Offset Estimator for QAM Optical Coherent Receivers
Tadao NAKAGAWA Takayuki KOBAYASHI Koichi ISHIHARA Yutaka MIYAMOTO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2016/07/01
Vol. E99-B  No. 7  pp. 1416-1425
Type of Manuscript:  PAPER
Category: Fiber-Optic Transmission for Communications
Keyword: 
optical fiber communication, optical receivers, quadrature amplitude modulation, digital signal processing, frequency offset estimation, 
 Summary | Full Text:PDF
Maximum Likelihood Demodulators and Their Evaluations on Amplify-and-Forward Cooperative OFDM-Based Wireless LAN Systems
Hayato FUKUZONO Yusuke ASAI Riichi KUDO Koichi ISHIHARA Masato MIZOGUCHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2014/11/01
Vol. E97-B  No. 11  pp. 2435-2448
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
cooperative communication, orthogonal frequency division multiplexing (OFDM), wireless local area network (LAN), amplify-and-forward (AF) mode, Golden code, Alamouti code, log likelihood ratio, 
 Summary | Full Text:PDF
Implementation and Evaluation of Real-Time Distributed Zero-Forcing Beamforming for Downlink Multi-User MIMO Systems
Tomoki MURAKAMI Koichi ISHIHARA Riichi KUDO Yusuke ASAI Takeo ICHIKAWA Masato MIZOGUCHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/10/01
Vol. E96-B  No. 10  pp. 2521-2529
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Antennas and Propagation in Conjunction with Main Topics of ISAP2012)
Category: Wireless Communication Technologies
Keyword: 
multiuser MIMO, inter-cell interference, distributed system, wireless LAN system, 
 Summary | Full Text:PDF
Game-Theoretic Analysis of Multibandwidth Channel Selection by Coordinated APs in WLANs
Kohei HANADA Koji YAMAMOTO Masahiro MORIKURA Koichi ISHIHARA Riichi KUDO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/06/01
Vol. E96-B  No. 6  pp. 1277-1287
Type of Manuscript:  Special Section PAPER (Special Section on Heterogeneous Networks for Future Cellular Systems)
Category: 
Keyword: 
wireless LAN, multibandwidth, channel selection, IEEE 802.11ac, overlapping BSS, game theory, 
 Summary | Full Text:PDF
A Band-Divided Receiver Prototype for Wideband Optical Signals
Munehiro MATSUI Riichi KUDO Yasushi TAKATORI Tadao NAKAGAWA Koichi ISHIHARA Masato MIZOGUCHI Takayuki KOBAYASHI Yutaka MIYAMOTO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2011/07/01
Vol. E94-B  No. 7  pp. 1801-1808
Type of Manuscript:  Special Section PAPER (Joint Special Section on Opto-electronics and Communications for Future Optical Network)
Category: 
Keyword: 
coherent receiver, analog to digital converter, OFDM, real-time, heterodyne receiver, 
 Summary | Full Text:PDF
A Novel Dynamic Channel Access Scheme Using Overlap FFT Filter-Bank for Cognitive Radio
Motohiro TANABE Masahiro UMEHIRA Koichi ISHIHARA Yasushi TAKATORI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/12/01
Vol. E92-B  No. 12  pp. 3589-3596
Type of Manuscript:  Special Section PAPER (Special Section on Dynamic Spectrum Access)
Category: Spectrum Allocation
Keyword: 
dynamic spectrum access, channel access, overlap FFT, filter-bank, 
 Summary | Full Text:PDF
Frequency-Domain Equalization for Coherent Optical Single-Carrier Transmission Systems
Koichi ISHIHARA Takayuki KOBAYASHI Riichi KUDO Yasushi TAKATORI Akihide SANO Yutaka MIYAMOTO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/12/01
Vol. E92-B  No. 12  pp. 3736-3743
Type of Manuscript:  PAPER
Category: Fiber-Optic Transmission for Communications
Keyword: 
frequency-domain equalization (FDE), coherent optical transmission, chromatic dispersion (CD), polarization mode dispersion (PMD), digital signal processing (DSP), 
 Summary | Full Text:PDF
Overlap Frequency-Domain Multiuser Detection for Asynchronous Uplink Multiuser MIMO-OFDM Systems
Koichi ISHIHARA Yasushi TAKATORI Kentaro NISHIMORI Kazuyasu OKADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/05/01
Vol. E92-B  No. 5  pp. 1582-1588
Type of Manuscript:  Special Section PAPER (Special Section on Radio Access Techniques for 3G Evolution)
Category: 
Keyword: 
multiuser MIMO (MU-MIMO), multiuser detection (MUD), OFDM, uplink, timing offset, inter-block interference (IBI), 
 Summary | Full Text:PDF
New Robust Beamforming Method for Frequency Offsets in Uplink Multiuser OFDM-MIMO
Yasushi TAKATORI Riichi KUDO Atsushi OHTA Koichi ISHIHARA Kentaro NISHIMORI Shuji KUBOTA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/09/01
Vol. E90-B  No. 9  pp. 2312-2320
Type of Manuscript:  Special Section PAPER (Special Section on 2006 International Symposium on Antennas and Propagation)
Category: Smart Antennas
Keyword: 
multiuser MIMO, uplink, beamforming, frequency offset, 
 Summary | Full Text:PDF
Frequency-Domain Multi-Stage Soft Interference Cancellation for DS-CDMA Uplink Signal Transmission
Koichi ISHIHARA Kazuaki TAKEDA Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/05/01
Vol. E90-B  No. 5  pp. 1152-1161
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
DS-CDMA, frequency-domain equalization (FDE), MUI cancellation, multi-user detection (MUD), 
 Summary | Full Text:PDF
Iterative Channel Estimation for Frequency-Domain Equalization of DSSS Signals
Koichi ISHIHARA Kazuaki TAKEDA Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/05/01
Vol. E90-B  No. 5  pp. 1171-1180
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
DSSS, frequency-domain equalization (FDE), channel estimation, 
 Summary | Full Text:PDF
Frequency-Domain ICI Cancellation with MMSE Equalization for DS-CDMA Downlink
Kazuaki TAKEDA Koichi ISHIHARA Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2006/12/01
Vol. E89-B  No. 12  pp. 3335-3343
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
DS-CDMA, frequency-domain equalization, MMSE, ICI cancellation, 
 Summary | Full Text:PDF
Iterative Frequency-Domain Soft Interference Cancellation for Multicode DS- and MC-CDMA Transmissions and Performance Comparison
Koichi ISHIHARA Kazuaki TAKEDA Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2006/12/01
Vol. E89-B  No. 12  pp. 3344-3355
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
DS-CDMA, MC-CDMA, frequency-domain equalization (FDE), multicode, interference cancelation, 
 Summary | Full Text:PDF
Pilot-Assisted Decision Feedback Channel Estimation for STTD in OFDM Mobile Radio
Koichi ISHIHARA Kazuaki TAKEDA Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/02/01
Vol. E88-B  No. 2  pp. 561-567
Type of Manuscript:  Special Section PAPER (Special Section on Multi-carrier Signal Processing Techniques for Next Generation Mobile Communications--Part2)
Category: 
Keyword: 
pilot, decision feedback, channel estimation, OFDM, STTD, 
 Summary | Full Text:PDF