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標題: A low-complexity adaptive receiver for DS-CDMA systems in unknown code delay environment
作者: Chen, J.D.
Ueng, F.B.
Lin, P.F.
關鍵字: DS/CDMA
adaptive receiver
interference rejection
fading channels
期刊/報告no:: International Journal of Communication Systems, Volume 24, Issue 2, Page(s) 225-238.
摘要: In direct-sequence code division multiple access (DS/CDMA) multiuser communication systems in multipath channels, both intersymbol interference (ISI) and multiple-access interference (MAI) must be considered. The multipath channel characterizes the propagation effects including the timing offset and delays, etc. Traditionally, we use the delay-locked loop (DLL) code tracking loop to recover the timing delay. But DLL cannot work well in multipath environment. In this paper, we propose a low-complexity adaptive receiver to suppress ISI/MAI and solve the timing offset problems without using conventional DLL code tracking loop. The proposed receiver employs an adaptive filter whose weights are adapted using a block least-mean square error algorithm with fractional sampling. Simulations confirm the good performance, including learning curves and theoretical analysis of minimum mean-square error, of the proposed receiver. Copyright (C) 2010 John Wiley & Sons, Ltd.
ISSN: 1074-5351
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