Title :
Semi-blind suppression of MAI in multipath CDMA channels
Author :
Pacheco, Ryan A. ; Hatzinakos, Dimitnos
Author_Institution :
Dept. of Electr. & Comput. Eng., Toronto Univ., Ont., Canada
Abstract :
A semi-blind technique for demodulating a user´s signal in the presence of multiple access interference (MAI) anti-multipath propagation for DS-CDMA signals is considered. The technique originally formulated for short-burst TDMA is carefully adapted for the case of CDMA spread spectrum systems. It is shown, via simulations, that our approach outperforms the conventional training-based approach to MAI suppression. Application of this technique is in 3rd generation DS-CDMA systems where it has been proposed that pilot symbols (training) be periodically time-multiplexed with information symbols on the data channel for each user.
Keywords :
cellular radio; code division multiple access; demodulation; interference suppression; least squares approximations; multipath channels; multiuser channels; radio receivers; radiofrequency interference; spread spectrum communication; 3rd generation DS-CDMA systems; DS-CDMA signals; LS estimator; MAI suppression; anti-multipath propagation; constant modulus criterion; data channel; data symbols; demodulation; information symbols; intra-cell user spreading codes; multipath CDMA channels; multiple access interference; multistage receiver structure; pilot symbols; semi-blind receiver; semi-blind suppression; short-burst TDMA; simulations; time-multiplexing; training symbols; training-based approach; Adaptive arrays; Demodulation; Fading; Multiaccess communication; Multipath channels; Multiple access interference; Receiving antennas; Signal resolution; Spread spectrum communication; Time division multiple access;
Conference_Titel :
Signals, Systems, and Computers, 1999. Conference Record of the Thirty-Third Asilomar Conference on
Conference_Location :
Pacific Grove, CA, USA
Print_ISBN :
0-7803-5700-0
DOI :
10.1109/ACSSC.1999.831886
