Title :
A multistage multi-carrier CDMA receiver with enhanced interference suppression
Author :
Deng, Juinn-Horng ; Lee, Ta-Sung
Author_Institution :
Dept. of Commun. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan
Abstract :
A multistage multi-carrier CDMA (MSMC-CDMA) receiver with enhanced multiple access interference (MAI) suppression is proposed. MC-CDMA is based on a combination of CDMA and orthogonal frequency division multiplexing (OFDM) techniques. The design of the receiver involves the following procedure. First, a set of adaptive matched filters (MF) is constructed to collect multipath signals with different time delays. The tap weights of each MF are determined in accordance with the linearly constrained minimum variance (LCMV) criterion so that strong MAI can be effectively suppressed. Second, channel estimation and signal reconstruction are accomplished by exploiting pilot symbols, decision-directed symbols and the signal´s signature. Finally, a decision-directed RAKE receiver gives the estimate of the signal, which is then subtracted from the data sent to the next stage. The proposed receiver can be used in a reverse link system with time-multiplexed pilot symbols, and achieves nearly the performance of the optimal maximum SINR (MSINR) receiver
Keywords :
OFDM modulation; adaptive filters; code division multiple access; delays; interference suppression; matched filters; multipath channels; parameter estimation; radio receivers; radiofrequency interference; signal reconstruction; MAI suppression; OFDM; adaptive matched filters; channel estimation; decision-directed RAKE receiver; decision-directed symbols; enhanced interference suppression; filter tap weights; linearly constrained minimum variance criterion; multipath signals; multiple access interference; multistage multi-carrier CDMA receiver; optimal maximum SINR receiver; orthogonal frequency division multiplexing; pilot symbols; receiver design; reverse link system; signal reconstruction; signal signature; time delays; time-multiplexed pilot symbols; Channel estimation; Delay effects; Fading; Matched filters; Multiaccess communication; Multicarrier code division multiple access; Multiple access interference; OFDM; RAKE receivers; Signal reconstruction;
Conference_Titel :
Wireless Communications, 2001. (SPAWC '01). 2001 IEEE Third Workshop on Signal Processing Advances in
Conference_Location :
Taiwan
Print_ISBN :
0-7803-6720-0
DOI :
10.1109/SPAWC.2001.923869
