Hiroyasu ISHIKAWA


Method for Detecting User Positions with Unmanned Aerial Vehicles Based on Doppler Shifts
Hiroyasu ISHIKAWA Hiroki ONUKI Hideyuki SHINONAGA 
Publication:   
Publication Date: 2019/01/01
Vol. E102-A  No. 1  pp. 195-204
Type of Manuscript:  Special Section PAPER (Special Section on Wideband Systems)
Category: 
Keyword: 
unmanned aerial vehiclesDoppler shiftposition-detection accuracyleast-squares methodpositioning accuracy index
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Multiple Symbol Differential Detection with Majority Decision Method for DQPSK in LOS Channel
Hiroyasu ISHIKAWA Hideyuki SHINONAGA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/01/01
Vol. E96-B  No. 1  pp. 384-388
Type of Manuscript:  LETTER
Category: Satellite Communications
Keyword: 
multiple symbol differential detectionmajority decision methodfrequency offset compensation technique
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A Delta-Sigma Modulator Using a Non-uniform Quantizer Adjusted for the Probability Density of Input Signals
Toru KITAYABU Mao HAGIWARA Hiroyasu ISHIKAWA Hiroshi SHIRAI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/07/01
Vol. E95-B  No. 7  pp. 2257-2265
Type of Manuscript:  PAPER
Category: Fundamental Theories for Communications
Keyword: 
delta-sigma modulatornon-uniform quantizerquantization noise
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Small-Sized Shaped Beam Base Station Antenna with Superior Intersector Interference Reduction in High Speed Cellular Systems
Masayuki NAKANO Hiroyasu ISHIKAWA Shinichi NOMOTO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/10/01
Vol. E93-B  No. 10  pp. 2586-2594
Type of Manuscript:  Special Section PAPER (Special Section on Advanced Technologies in Antennas and Propagation in Conjunction with Main Topics of ISAP2009)
Category: Antennas
Keyword: 
shaped beambase station antennainter-sector interferenceCINRhigh-speed cellular systems
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Evaluation of MC-CDMA with Frequency Interleaving Technique in Frequency Selective Fading Channel
Masato FURUDATE Hiroyasu ISHIKAWA Toshinori SUZUKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/02/01
Vol. E88-B  No. 2  pp. 443-451
Type of Manuscript:  Special Section PAPER (Special Section on Multi-carrier Signal Processing Techniques for Next Generation Mobile Communications--Part2)
Category: 
Keyword: 
MC-CDMAfrequency-interleaverfrequency-domain equalizationfrequency selective fading channel
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Experimental Results of Future Road-to-Vehicle Communications System with Handover Function
Tadayuki FUKUHARA Kenya YONEZAWA Hiroyasu ISHIKAWA Keizo SUGIYAMA Hideyuki SHINONAGA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2004/10/01
Vol. E87-A  No. 10  pp. 2649-2656
Type of Manuscript:  Special Section PAPER (Special Section on Wide Band Systems)
Category: 
Keyword: 
DSRChandoverITShandover processing delay
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Growth of 100-mm-Diameter AlGaN/GaN Heterostructures on Sapphire Substrates by MOVPE
Makoto MIYOSHI Masahiro SAKAI Hiroyasu ISHIKAWA Takashi EGAWA Takashi JIMBO Mitsuhiro TANAKA Osamu ODA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2003/10/01
Vol. E86-C  No. 10  pp. 2077-2081
Type of Manuscript:  Special Section PAPER (Special Issue on Heterostructure Microelectronics with TWHM2003)
Category: 
Keyword: 
AlGaN/GaNheterostructureMOVPEuniformitybowing
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Low Noise and Low Distortion Performances of an AlGaN/GaN HFET
Yutaka HIROSE Yoshito IKEDA Motonori ISHII Tomohiro MURATA Kaoru INOUE Tsuyoshi TANAKA Hiroyasu ISHIKAWA Takashi EGAWA Takashi JIMBO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2003/10/01
Vol. E86-C  No. 10  pp. 2058-2064
Type of Manuscript:  Special Section PAPER (Special Issue on Heterostructure Microelectronics with TWHM2003)
Category: 
Keyword: 
AlGaN/GaN HFETlow noise amplifiernoise figure (NF)intermodulation distortion
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High-Quality AlGaN/GaN HEMTs on Epitaxial AlN/Sapphire Templates
Masahiro SAKAI Kenta ASANO Subramaniam ARULKUMARAN Hiroyasu ISHIKAWA Takashi EGAWA Takashi JIMBO Tomohiko SHIBATA Mitsuhiro TANAKA Osamu ODA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2003/10/01
Vol. E86-C  No. 10  pp. 2071-2076
Type of Manuscript:  Special Section PAPER (Special Issue on Heterostructure Microelectronics with TWHM2003)
Category: 
Keyword: 
AlGaN/GaNHEMTAlNtemplate
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18 Mbit/s Carrier Frequency Offset-Spread Spectrum (CFO-SS) System Using 2.4 GHz ISM Band
Hiroyasu ISHIKAWA Naoki FUKE Keizo SUGIYAMA Hideyuki SHINONAGA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/12/01
Vol. E85-A  No. 12  pp. 2839-2846
Type of Manuscript:  Special Section PAPER (Special Section on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
CFO-SSwireless accesshigh speed2.4 GHz ISM banddual-polarization technique
 Summary | Full Text:PDF

Investigations on Strained AlGaN/GaN/Sapphire and GaInN Multi-Quantum-Well Surface LEDs Using AlGaN/GaN Bragg Reflectors
Hiroyasu ISHIKAWA Naoyuki NAKADA Masaharu NAKAJI Guang-Yuan ZHAO Takashi EGAWA Takashi JIMBO Masayoshi UMENO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2000/04/25
Vol. E83-C  No. 4  pp. 591-597
Type of Manuscript:  Special Section PAPER (Special Issue on Blue Laser Diodes and Related Devices/Technologies)
Category: 
Keyword: 
light emitting diode (LED)distributed Bragg reflector (DBR)GaNAlGaNGaInN
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Design of Carrier Frequency Offset-Spread Spectrum (CFO-SS) System Using 2.4 GHz ISM Band
Hiroyasu ISHIKAWA Hideyuki SHINONAGA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1999/12/25
Vol. E82-A  No. 12  pp. 2669-2676
Type of Manuscript:  Special Section PAPER (Special Section on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
wireless LANCFO-SS2.4 GHz ISM band
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Carrier Frequency Offset-Spread Spectrum (CFO-SS) Method for Wireless LAN System Using 2.4 GHz ISM Band
Hiroyasu ISHIKAWA Hideyuki SHINONAGA Hideo KOBAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1997/12/25
Vol. E80-A  No. 12  pp. 2366-2371
Type of Manuscript:  Special Section PAPER (Special Section on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
wireless LAN systemsspread spectrum2.4 GHz ISM bandcarrier frequency offsetSAW matched filter
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A Novel Selection Diversity Method with Decision Feedback Equalizer
Hiroyasu ISHIKAWA Hideo KOBAYASHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1994/05/25
Vol. E77-B  No. 5  pp. 566-572
Type of Manuscript:  Special Section PAPER (Special Issue on Adaptive Signal Processing in Mobile Radio Communications)
Category: 
Keyword: 
decision feedback equalizermultipath fadingselection diversitydigital land mobile communications system
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