Hirofumi ICHIKAWA

Long-Span Quasi-Millimeter-Wave-Band Fixed Wireless Access System Employing Link Adaptation by Symbol Rate
Mitsutoshi MATSUDA Kazuji WATANABE Hirofumi ICHIKAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2004/01/01
Vol. E87-B  No. 1  pp. 117-123
Type of Manuscript:  PAPER
Category: Terrestrial Radio Communications
Keyword: 
quasi-millimeter-wave-band, FWA, rain attenuation, symbol rate, link adaptation, 
 Summary | Full Text:PDF(1.8MB)
A Centralized Control Microcell Radio System with Spectrum Delivery Switches
Hirofumi ICHIKAWA Mamoru OGASAWARA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1993/09/25
Vol. E76-B  No. 9  pp. 1115-1121
Type of Manuscript:  Special Section PAPER (Special Issue on Fiber-optic Microcelluler Radio Communication System and Their Technologies)
Category: System and Network Matters
Keyword: 
centralized control, subcarrier multiplexing, switch, TDMA, microcell, dynamic channel assignment, hand over, 
 Summary | Full Text:PDF(540.3KB)
Fiber-Optic Microcell Radio System with a Spectrum Delivery Switch
Hirofumi ICHIKAWA Hiroyuki OHTSUKA Takehiro MURASE 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1993/02/25
Vol. E76-C  No. 2  pp. 279-286
Type of Manuscript:  Special Section PAPER (Special Issue on Optical/Microwave Interaction Devices, Circuits and Systems)
Category: Fiber Optic Radio Links
Keyword: 
subcarrier optical transmission, frequency modulation, dynamic range, intermodulation distortion, diversity, microcell radio, multicarrier, 
 Summary | Full Text:PDF(572.9KB)