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Next Generation Wireless Systems and Networks
In the last decade, the explosive growth of mobile and wireless communications has brought a fundamental change to the design of wireless systems and networks. The demands on traditional voice-centric services have been quickly overtaken by data-centric applications. The circuit-switched end-to-end connection communication system and network design philosophy has been replaced by all-IP packet-switched connectionless architecture. The traditional layered architecture of wireless communication systems or networks has faced a great challenge from cross-layer optimized design. The previously clearly defined boundaries between the seven Open System Interface (OSI) layers are diminishing. On the other hand, the advancement in microelectronics has made it possible to implement a complex communication end-user terminal in a pocket-sized or a namecard-sized handset, even with sufficiently high intelligence to work adaptively to the changing environment (i.e. cognitive radio). At the same time, the data transmission rate through a wireless air-link has increased tremendously, from 9.6 kbps in 1995 (on GSM) to 2 Mbps in 2005 (on a WCDMA system), increasing by more than 200 times within the last 10 years. The international research community has targeted “Super-3G” or “Beyond-3G” wireless systems and networks with a peak data transmission rate that can reach as high as 500 Mbps, as demonstrated in the very recent field trials made in Japan by NTT DoCoMo. Even more ambitious 4G wireless systems and networks will provide a peak data transmission rate of approximately 1 Gbps. The great demands on the capacity and quality offered over wireless communication links have pushed us hard to innovate new design methodologies and concepts for wireless systems and networks.
This book project was initiated to respond to the evolutional trend in the design of wireless systems and networks. It is written as an attempt to offer a handy reference, which has taken in almost all the essential background of wireless communications on both the system level and the network level, including the fundamental knowledge of wireless communication channels, almost all major 3G mobile cellular standards, wireless local area networks (LANs), wireless personal area networks (PANs), Bluetooth, All-IP wireless networking, B3G wireless, and other emerging technologies, such as ultra-wideband (UWB), orthogonal frequency-division multiplexing (OFDM), multiple-input multiple-output (MIMO), cognitive radio, and evolution UTRAN (E-UTRAN) systems. Inevitably, it was extremely difficult to write this book in the sense that we had to make a great effort to keep a good balance on the completeness of the coverage and limited page budget. We do hope that this project has achieved the goal and will be appreciated by you, the readers.
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