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Mobile/fixed wireless access systems which can carry more
high speed data and broadband signals are strongly demanded
for multimedia services due to the high performance of portable
computers. In addition to wireless LANs whose frequencies
are 2.4GHz band, IEEE802.11a and HYPERLAN2 have been standardized
for the broad band high performance LANs. These systems provide
us with 54Mbps of data rate, using 5.2-GHz band. However,
enlargement of communication capacity per terminal more than
100Mbps and expansion of mobility support have been further
required. As the rapid increase of cellular phone at the present,
we also predict that a shortage of frequency will occur in
the future. Therefore, immediate research development of high-speed
indoor/outdoor wireless access communication systems which
are able to accommodate more channels, to transmit broader
band signals from wired access networks is intensely expected.
Millimeter-waves have been expected to transmit high-speed
data because of their frequency bands. Since a number of broadband
wireless applications, e.g., home link systems, short-range
AdHoc systems, local multipoint distribution services (LMDS),
millimeter-wave video distribution services (MVDS), broadband
fixed / nomadic wireless access (FWA / NWA) systems, wireless
CATV systems, vertically connected wireless systems, and automotive
collision avoidance radar have been investigated many organizations,
millimeter waves are now recognized as broadband frequency
resources that can offer various wireless multimedia applications.
In this paper, the novel millimeter-wave wireless access systems
developed by CRL Yokosuka Radio Communication Research Center
will be discussed and presented.
Biography
Hiroyo Ogawa received the B.S., M.S., and Dr. Eng. degrees
in electrical engineering from Hokkaido University, Sapporo,
in 1974, 1976, and 1983, respectively. He joined the Yokosuka
Electrical Communication Laboratories, Nippon Telegraph and
Telephone Public Corporation, Yokosuka, in 1976. He has been
engaged in the research and development on microwave and millimeter-wave
integrated circuits, monolithic integrated circuits, and subscriber
radio systems. From 1990 to 1992, he was engaged in the research
of optical/microwave monolithic integrated circuits and fiber
optic links for millimeter-wave personal communication systems
at ATR Optical and Radio Communication Research Laboratories.
From 1993 to 1998, he was engaged in microwave photonics and
microwave and millimeter-wave signal processing techniques
for communication satellites at NTT Wireless Systems Laboratories.
In July 1998 he joined the Communication Research Laboratory,
Ministry of Posts and Telecommunications, and he has been
researching and developing on millimeter-wave wireless access
systems.
Dr. Ogawa served on the IEEE MTT-S Symposium Technical Committee
and was a member of the MTT-S Technical Committee and MWP
Steering Committee. He also served on Editorial Committee
of IEICE Trans. on Electronics as an associate editor in 1990-1992,
MTT-Tokyo Chapter as a secretary/treasurer in 1991-1992, IEICE
Microwave Technical Group as a secretary in 1993-1994 and
a vice-chair in 1999-2002, IEICE Microwave Photonics Technical
Group as a secretary in 1995-1998, a vice-chair in 1999-2000,
and a chair in 2001-2002, the 1996 International Topical Meeting
on Microwave Photonics (MWP96) as a secretary and MWP2002
as a finance chair. He also chaired the Technical Program
Committee of 1998 Asia-Pacific Microwave Conference (APMC98)
and served on the Steering Committee of APMC2002 as a vice-chair.
He has served on TSMMW(Topical Symposium on Millimeter Waves)
Committee as a secretary since 1999. He is a member of the
Institute of Electronics, Information and Communication Engineers
(IEICE) of Japan and IEEE. |
