| Multi-carrier code division multiple access (MC-CDMA) systems are well suited for high data rate wireless multimedia services due to their capability of converting the frequency-selective fading channels to distinct frequency-flat ones with low-complexity fast Fourier transform (FFT) devices. However, in multiuser MC-CDMA systems, the frequency selectivity and variation of the users' geographical locations give rise to the multiuser interference (MUI) which induces a significant performance degradation of the systems. In order to mitigate MUI, we present a joint interference suppression algorithm of transmitter power control, receiver array processing and multiuser detection. In addition to the interference suppression using this algorithm, the frequency selectivity also provides multipath diversity if appropriately exploited. Simulations confirm the outstanding performance improvement of this algorithm compared with existing alternatives in MC-CDMA systems, and also confirm that the algorithm performs better in frequency-selective fading channels than in frequency-flat fading ones due to the multipath diversity.
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| Liuqing Yang received her B.S. degree in Electrical Engineering from Huazhong University of Science and Technology, Wuhan, China, in 1994, and her M.Sc. and Ph.D. degrees in Electrical and Computer Engineering from the University of Minnesota, Minneapolis, in 2002 and 2004, respectively. Since August 2004, she has been an assistant professor with the Department of Electrical and Computer Engineering at the University of Florida, Gainesville. Her research interests include communications, signal processing and networking. Her current research encompasses cooperative networks, autonomous wireless networks, resource optimization, synchronization, channel estimation, equalization, multiple access, space-time coding, multi-carrier wireless systems and ultra-wideband communications. |