Katsuya NAKAHIRA


Undesired Radiation Suppression Technique for Distributed Array Antenna by Antenna Positioning and Delay Signal Processing
Kouhei SUZUKI Hideya SO Daisuke GOTO Yoshinori SUZUKI Fumihiro YAMASHITA Katsuya NAKAHIRA Kiyoshi KOBAYASHI Takatoshi SUGIYAMA 
Publication:   
Publication Date: 2017/10/01
Vol. E100-B  No. 10  pp. 1959-1967
Type of Manuscript:  PAPER
Category: Satellite Communications
Keyword: 
distributed array antenna (DAA)undesired radiation suppressiondelay compensationsatellite communication
 Summary | Full Text:PDF(4.5MB)

MAC Protocol for Improving Throughput and Balancing Uplink/Downlink Throughput for Wireless Local Area Networks with Long Propagation Delays
Takayuki NISHIO Kaito FUNABIKI Masahiro MORIKURA Koji YAMAMOTO Daisuke MURAYAMA Katsuya NAKAHIRA 
Publication:   
Publication Date: 2017/05/01
Vol. E100-B  No. 5  pp. 874-883
Type of Manuscript:  PAPER
Category: Terrestrial Wireless Communication/Broadcasting Technologies
Keyword: 
wireless local area network (WLAN)long propagation delayIEEE 802.11MAC protocollong-distance WLANradio over fiber WLANCSMA/CA
 Summary | Full Text:PDF(2.7MB)

Throughput Enhancement for SATCOM Systems Using Dynamic Spectrum Controlled Channel Allocation under Variable Propagation Conditions
Katsuya NAKAHIRA Jun MASHINO Jun-ichi ABE Daisuke MURAYAMA Tadao NAKAGAWA Takatoshi SUGIYAMA 
Publication:   
Publication Date: 2017/02/01
Vol. E100-B  No. 2  pp. 390-399
Type of Manuscript:  PAPER
Category: Satellite Communications
Keyword: 
satellite communicationchannel allocationresource controladaptive coding and modulationspectrum compressionspectrum divisiondemand assigned multiple access
 Summary | Full Text:PDF(2.6MB)

Novel Channel Allocation Algorithm Using Spectrum Control Technique for Effective Usage of both Satellite Transponder Bandwidth and Satellite Transmission Power
Katsuya NAKAHIRA Jun-ichi ABE Jun MASHINO Takatoshi SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/11/01
Vol. E95-B  No. 11  pp. 3393-3403
Type of Manuscript:  Special Section PAPER (Special Section on Satellite Communication Technologies in Conjunction with Main Topics of JC-SAT2011)
Category: 
Keyword: 
satellite communicationchannel allocationadaptive coding and modulationmulti-carrier transmissionsingle-carrier transmissionspectrum compressionspectrum divisionDAMA
 Summary | Full Text:PDF(2.3MB)

A Highly Efficient DAMA Algorithm for Making Maximum Use of both Satellite Transponder Bandwidth and Transmission Power
Katsuya NAKAHIRA Takatoshi SUGIYAMA Hiroki NISHIYAMA Nei KATO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/08/01
Vol. E95-B  No. 8  pp. 2619-2630
Type of Manuscript:  PAPER
Category: Satellite Communications
Keyword: 
satellite communicationchannel allocationadaptive modulation and codingmulti-carrier transmissionDAMA
 Summary | Full Text:PDF(2.3MB)

Direct Spectrum Division Transmission for Highly Efficient Frequency Utilization in Satellite Communications
Jun-ichi ABE Fumihiro YAMASHITA Katsuya NAKAHIRA Kiyoshi KOBAYASHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/02/01
Vol. E95-B  No. 2  pp. 563-571
Type of Manuscript:  PAPER
Category: Satellite Communications
Keyword: 
satellite communicationsfilter bankdirect spectrum division transmissionspectrum editing technique
 Summary | Full Text:PDF(2.3MB)

A Highly Efficient and Flexible Channel Allocation Scheme for Hyper Multi-Point Data Gathering Satellite Communication Systems
Katsuya NAKAHIRA Kiyoshi KOBAYASHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/11/01
Vol. E92-B  No. 11  pp. 3309-3317
Type of Manuscript:  Special Section PAPER (Special Section on Satellite Communication Technologies in Conjunction with Main Topics of JC-SAT2008)
Category: 
Keyword: 
satellite communicationchannel allocationsensor networkdata gathering
 Summary | Full Text:PDF(1.5MB)

Communication Capacity and Quality Enhancement Using a Two-Layered Adaptive Resource Allocation Scheme for Multi-Beam Mobile Satellite Communication Systems
Katsuya NAKAHIRA Kiyoshi KOBAYASHI Masazumi UEBA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/07/01
Vol. E89-A  No. 7  pp. 1930-1939
Type of Manuscript:  Special Section PAPER (Special Section on Multi-dimensional Mobile Information Networks)
Category: 
Keyword: 
mobile satellite communicationmulti beamresource allocationcapacity enhancementQoSoptimization
 Summary | Full Text:PDF(1MB)