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IEICE Trans

Daisei UCHIDA

Null-Space Expansion Applications to MIMO with Distributed Antennas
Makoto TAROMARU Hidekazu MURATA Masaharu ABIRU Yuki OHI Shohei KOBAYASHI Tatsuhiko IWAKUNI Daisei UCHIDA Takafumi FUJITA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2026/04/01
Vol. E109-B  No. 4  pp. 490-499
Type of Manuscript:  INVITED PAPER (Special Section on Wired and Wireless Network System Technologies in Beyond 5G/6G Era)
Category: 
Keyword: 
MIMO, null-space expansion, fast fading, distributed antenna, 
 Summary | Full Text:PDF
Null-Space Expansion Applications to MIMO with Distributed Antennas
Makoto TAROMARU Hidekazu MURATA Masaharu ABIRU Yuki OHI Shohei KOBAYASHI Tatsuhiko IWAKUNI Daisei UCHIDA Takafumi FUJITA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2026/04/01
Vol. E109-B  No. 4  pp. 490-499
Type of Manuscript:  INVITED PAPER (Special Section on Wired and Wireless Network System Technologies in Beyond 5G/6G Era)
Category: 
Keyword: 
MIMO, null-space expansion, fast fading, distributed antenna, 
 Summary | Full Text:PDF
A Beam Search Method with Adaptive Beam Width Control Based on Area Size for Initial Access
Takuto ARAI Daisei UCHIDA Tatsuhiko IWAKUNI Shuki WAI Naoki KITA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2023/04/01
Vol. E106-B  No. 4  pp. 359-366
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
beam search, initial access, high frequency bands, overhead reduction, distributed antenna, beam width, antenna arrays, 
 Summary | Full Text:PDF
Handover Experiment of 60-GHz-Band Wireless LAN in over 200-km/h High-Speed Mobility Environment
Tatsuhiko IWAKUNI Daisei UCHIDA Takuto ARAI Shuki WAI Naoki KITA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2023/04/01
Vol. E106-B  No. 4  pp. 384-391
Type of Manuscript:  PAPER
Category: Terrestrial Wireless Communication/Broadcasting Technologies
Keyword: 
6G, millimeter wave, IEEE 802.11ad, positioning, handover, 
 Summary | Full Text:PDF
Design for Operation in Two Frequency Bands by Division of the Coupled Region in a Waveguide 2-Plane Coupler
Shihao CHEN Takashi TOMURA Jiro HIROKAWA Kota ITO Mizuki SUGA Yushi SHIRATO Daisei UCHIDA Naoki KITA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2022/12/01
Vol. E105-C  No. 12  pp. 729-739
Type of Manuscript:  PAPER
Category: Electromagnetic Theory
Keyword: 
coupler, finite element method, hollow waveguide, mode matching, 
 Summary | Full Text:PDF
A Burst Modulation/Demodulation Method for Narrowband Ubiquitous Communication Systems
Takafumi FUJITA Daisei UCHIDA Yosuke FUJINO Osamu KAGAMI Kazuji WATANABE 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/11/01
Vol. E91-B  No. 11  pp. 3416-3425
Type of Manuscript:  Special Section PAPER (Special Section on Emerging Technologies for Practical Ubiquitous and Sensor Networks)
Category: 
Keyword: 
burst modem, ubiquitous, transmission efficiency, burst synchronization, testbed study, 
 Summary | Full Text:PDF
A Synchronization Scheme for Packet Mode MIMO-OFDM Signals in Wireless LAN
Takeshi ONIZAWA Takafumi FUJITA Yusuke ASAI Daisei UCHIDA Atsushi OHTA Satoru AIKAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/01/01
Vol. E90-B  No. 1  pp. 92-104
Type of Manuscript:  PAPER
Category: Terrestrial Radio Communications
Keyword: 
wireless LAN, MIMO, OFDM, packet mode, synchronization, 
 Summary | Full Text:PDF
Implementation and Performance Evaluation of Simple SDM-COFDM Prototype Using Propagation Coefficient Matrix Tracking for Fast Fading MIMO Channels
Takatoshi SUGIYAMA Satoshi KUROSAKI Daisei UCHIDA Yusuke ASAI Masahiro UMEHIRA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/01/01
Vol. E88-B  No. 1  pp. 58-65
Type of Manuscript:  Special Section PAPER (Special Section on Multi-carrier Signal Processing Techniques for Next Generation Mobile Communications--Part 1)
Category: Space Division Multiplexing
Keyword: 
SDM, OFDM, MIMO, ZF, frequency utilization efficiency, 
 Summary | Full Text:PDF