Blind detection of multirate asynchronous CDMA signals in multipath channels
IEEE Transactions on Signal Processing
Adaptive MMSE receiver with beamforming for DS/CDMA systems
IEEE Transactions on Wireless Communications
Optimum near-far resistance for dual-rate DS/CDMA signals: random signature sequence analysis
IEEE Transactions on Information Theory
Adaptive receiver structures for asynchronous CDMA systems
IEEE Journal on Selected Areas in Communications
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Adaptive antennas, with spatial processing, used in code division multiple access (CDMA) systems can enhance range, reliability, and capacity. Moreover, the adaptive beamforming technologies can remove unwanted noise and interference from the received signal. In this paper, we propose the adaptive direct sequence (DS) CDMA antenna receivers and compare their performances in three existing multirate methodologies—variable processing gain (VPG), variable chip rate, and multicode systems for multiuser communications in multipath fading channels. Simulation results show that the processing powers of both narrowband and wideband adaptive antennas are not enough. We propose a powerful processing technique named Wiener Code Filter (WCF) to retrieve the shortcomings. Mean square error (MSE) analyses are also given in this paper. Some simulation examples are given to compare the performances of the proposed multirate structures. Copyright © 2010 John Wiley & Sons, Ltd.