Impact of Imperfect Power Control and Channel Estimation on the Performance of Multiuser Detectors in Synchronous DS-CDMA System

Authors:
Guoqiang Xue;Jianfeng Weng;Tho Le-Ngoc
Affiliations:
Department of Electrical and Computer Engineering, McGill University, 3480 University Street, Montreal, Quebec, Canada, H3A 2A7;Department of Electrical and Computer Engineering, McGill University, 3480 University Street, Montreal, Quebec, Canada, H3A 2A7;Department of Electrical and Computer Engineering, McGill University, 3480 University Street, Montreal, Quebec, Canada, H3A 2A7
Venue:
Wireless Personal Communications: An International Journal
Year:
2001

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Abstract

Simulation performance comparison of various linear multiuser and parallelinterference cancellation (PIC) detectors in the presence of imperfect powercontrol and channel estimation is presented. Results show that imperfect powercontrol degrades even the performance of a single-user detector. Therefore,tight power control is highly indispensable for suboptimal detectors tomaintain a good performance. When power control is not perfect, interferencecancellation detectors can outperform linear multiuser detectors. Amongcancellation detectors, the conventional [1] and partial PIC [2] detectors arefairly sensitive to channel estimation error, while the LMS PIC [3] is quiterobust in this regard.