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On the Multiple Access Performance of Prerake DS UWB System
Cao,WeiNational University of Singapore
Nallanathan,Arumugam National University of Singapore
Chai,Chin ChoyInstitute for Infocomm Research, Singapore
In this paper, we study the multiple access performance of a Prerake DS UWB system. Prerake technique not only simplifies the receiver structure significantly, but also provides low probability of detection and spatial security in communication. These features are very desirable in military/commercial applications. We present the system signal model in presence of inter-chip interference and inter-symbol interference. The bit error rate (BER) formula is derived based on this signal model. A degradation factor is defined to investigate the multiple access performance of the system. The relationship between the degradation factor and the number of users/bit rate are derived. We also explore the multiple access capacity per user. The BER formula is validated by simulation results in various UWB channel models. In numerical analysis, we highlight the tradeoff between the bit rate and BER performance. The plots on degradation factor vs number of users/bit rate further reveal the constraint between the bit rate and the number of users.
Nallanathan Arumugam (S’97–M’00–SM’05) received the B.Sc. degree (with honors) from the University of Peradeniya, Peradeniya, Sri Lanka, in 1991, the C.P.G.S. degree from the University of Cambridge, Cambridge, U.K., in 1994, and the Ph.D. degree from the University of Hong Kong, Hong Kong, in 2000, all in electrical engineering. He is currently an Assistant Professor in the Department of Electrical and Computer Engineering, National University of Singapore, Singapore. His current research interests are high-speed data transmission over wireless links, orthogonal frequency division multiplexing, ultrawideband communications systems, and wireless communications theory. Dr. Nallanathan currently serves as a Guest Editor for the EURASIP Journal on Wireless Communications and Networking Special issue on Ultra-Wideband Communication Systems—Technology and Applications. He also serves as an Associate Editor for the IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, the IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, the EURASIP Journal on Wireless Communications and Networking, and the Journal of Wireless Communications and Mobile Computing.