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the next generation cdma technologies
hsiao-hwa chen
Synopsis "the next generation cdma technologies"
the great success of internet and mobile cellular communications has opened a new vista for future all-ip wireless applications, being evident in continuously increasing demand for worldwide packet data services in the current 2.5g and 3g networks. it has been clear that the future wireless systems will be operating based mainly if not completely on burst data services carrying multimedia traffics, including voice, data, image and video. the need to support such a great amount of burst-type traffic in wireless channels has already posed a serious challenge to the currently available air-link technologies based on either tdma or cdma. there has been some debate in the community on the multiple access technologies most suitable for the beyond 3g wireless. some have suggested that the current cdma technologies (all based on direct sequence cdma, such as is-95a/b, cdma2000, umts-utra, w-cdma, td-scdma, etc.) are suited only for slow-speed continuous-transmission applications such as voice, but not suitable for high-speed burst-type traffic, which will be dominating in future all-ip 4g wireless. therefore, a fresh world-wide research effort is on the way to search for next generation cdma technologies, which should effectively address all the problems existing in the current cdma technologies, such as extremely low spreading efficiency (measured by bits carried by each chip), strictly interference-limited capacity, inefficient rate-matching algorithms, the need for precision power control, etc. the short-term objective is to look for new cdma technologies, which could effectively enhance overall bandwidth efficiency and detection efficiency, as well as fit the applications of the all-ip wireless. the ultimate goal, however, is to engineer an ideal cdma architecture whose capacity should be limited only by noise but not by interference. this book will serve as a stimulus to accelerate cdma technological evolution towards the next generation.
