Keishi MURAKAMI


2.65Gbps Downlink Communications with Polarization Multiplexing in X-Band for Small Earth Observation Satellite
Tomoki KANEKO Noriyuki KAWANO Yuhei NAGAO Keishi MURAKAMI Hiromi WATANABE Makoto MITA Takahisa TOMODA Keiichi HIRAKO Seiko SHIRASAKA Shinichi NAKASUKA Hirobumi SAITO Akira HIROSE 
Publication:   
Publication Date: 2021/01/01
Vol. E104-B  No. 1  pp. 1-12
Type of Manuscript:  POSITION PAPER
Category: Satellite Communications
Keyword: 
satellite communicationssmall satelliteDVB-S2XCross Polarization Discrimination (XPD)polarization multiplexing
 Summary | Full Text:PDF(1.8MB)

A Multiple-Symbol Differential Detection Based on Channel Prediction for Fast Time-Varying Fading
Hiroshi KUBO Akihiro OKAZAKI Kazuo TANADA Bertrand PENTHER Keishi MURAKAMI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/08/01
Vol. E88-B  No. 8  pp. 3393-3400
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
Viterbi detectionmaximum-likelihood detectiondifferential phase shift keyingfading channels
 Summary | Full Text:PDF(536.5KB)

DOA/TOA Measurement of 25 GHz Band for Urban Mobile Radio
Yoshihiko KUWAHARA Yoshimitsu IKI Kazuo NAGAO Shuichi OBAYASHI Keishi MURAKAMI Akio SATO Shoichiro KAWAMURA Masaharu HATA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1999/12/25
Vol. E82-B  No. 12  pp. 1974-1986
Type of Manuscript:  Special Section PAPER (Special Issue on Multimedia Mobile Communication Systems)
Category: 
Keyword: 
multipath propagationmobile communicationrelative powerdirection of arrivaltime of arrivalquasi millimeter wave
 Summary | Full Text:PDF(2.9MB)

A Multiple Open-Loop Frequency Estimation Based on Differential Detection for MPSK
Hiroshi KUBO Keishi MURAKAMI Makoto MIYAKE Tadashi FUJINO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1999/01/25
Vol. E82-B  No. 1  pp. 136-144
Type of Manuscript:  PAPER
Category: Radio Communication
Keyword: 
frequency estimationphase shift keyingdigital controlDoppler effect
 Summary | Full Text:PDF(549.1KB)

A Soft-Output Viterbi Equalizer Employing Expanded Memory Length in a Trellis
Takayuki NAGAYASU Hiroshi KUBO Keishi MURAKAMI Tadashi FUJINO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1997/02/25
Vol. E80-B  No. 2  pp. 381-385
Type of Manuscript:  LETTER
Category: Radio Communication
Keyword: 
soft-output Viterbi equalizerMAP algorithmViterbi algorithmsoft-decisionintersymbol interference
 Summary | Full Text:PDF(345.5KB)