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Adaptive H-subweight equalizer for DS-CDMA communication system in time-varying multipath channels

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3 Author(s)
Ching-Tai Chiang ; Dept. of Electr. Eng., Shou Univ., Ta-Hsu Tsiang, Taiwan ; Chian-Chung Chen ; Yuan-Hwang Chen

In order to overcome the MAI and ISI problems in time-varying multipath fading channels, a novel H-subweight algorithm for the decision feedback equalizer (DFE) in a DS-CDMA system is presented. The subweight technique can reduce the computational load of the H algorithm, but dynamic estimation error in subweight partition may degrade performance. The advantage of insensitivity to modeling error of the H algorithm just can mitigate the degradation of the subweight technique. Therefore, the individual advantages of the H algorithm and subweight technique can be successfully integrated. The H-subweight algorithm owns the advantages of low complexity and robustness against modeling error caused by the time-varying multipath channels as well as subweight partition. On the other hand, the RLS-subweight algorithm seriously suffers from the drawback of dynamic estimation error. The reduction of computational complexity by subweight partition is analyzed. Simulation results show that the H-subweight DPE outperforms the RLS-subweight DFE in suppressing equalization error

Published in:

Wireless Communications, 2001. (SPAWC '01). 2001 IEEE Third Workshop on Signal Processing Advances in

Date of Conference:

2001