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LBHIDDEN[0]LBHIDDENThis book discusses multi-carrier modulation and spread spectrum techniques, recognized
as the most promising candidate modulation methods for the 4th generation (4G) of
mobile communications systems. The authors of this book were the first to propose MCCDMA
for the next generation of mobile communications, and are still continuing their
contribution towards beyond 3G. Considering the requirements of 4G systems, multicarrier
and spread spectrum systems appear to be the most suitable as they provide higher
flexibility, higher transmission rates and frequency usage efficiency. This is the first book
on these methods, providing the reader with the fundamentals of the technologies involved
and the related applications.
The book deals with the principles through definitions of basic technologies and the
multipath channel over which the signals are transmitted. It defines MC-CDMA as a frequency
PN pattern and MC-DS-CDMA as a straight extension of DS-CDMA; and argues
that these twin asymmetric technologies are most suitable for 4G since MC-CDMA is
suitable for the downlink and MC-DS-CDMA is suitable for the uplink in the cellular
systems. Although MC-CDMA performs better than MC-DS-CDMA, it needs chip synchronization
between users, and is therefore difficult to deploy in the uplink. Thus, for
this asymmetric structure it is very important to understand the multi-carrier spread spectrum
methods. Hybrid multiple access schemes like Multi-Carrier FDMA, Multi-Carrier
TDMA, and Ultra Wide Band systems are discussed as more extended systems. Implementation
issues, including synchronization, channel estimation, and RF issues, are also
discussed in depth. Wireless local area networks, broadcasting transmission, and cellular
mobile radio are shown to realize seamless networking for 4G. Although cellular systems
have not yet been combined with other wireless networks, different wireless systems
should be seamlessly combined. The last part of this book discusses capacity and flexibility
enhancement technologies like diversity techniques, space–time/frequency coding,
and SDR (Software Defined Radio).
This book greatly assists not only theoretical researchers, but also practicing engineers
of the next generation of mobile communications systems.
March 2003
Prof. Masao Nakagawa
Department of Information and Computer Science
Keio University, Japan |
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发表于 2004-3-30 13:32:06
发表于 2004-9-15 13:56:34
