Performance of SIC Scheme with an Activity-Based Disparity Estimation in a DS/CDMA System

Chiho LEE  Gwangzeen KO  Kiseon KIM  

Publication
IEICE TRANSACTIONS on Communications   Vol.E85-B   No.2   pp.495-501
Publication Date: 2002/02/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technology
Keyword: 
DS/CDMA,  successive interference cancellation,  activity-based disparity estimation,  number of active users,  detection order among active users,  

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Summary: 
In this paper, we propose an activity-based estimation scheme to determine the received signal power disparity, that enhances the BER performance of the SIC scheme in a DS/CDMA system considering a practical voice activity factor, and compare BER performance with those of other schemes with or without estimation. Numerical analysis results show that the SIC scheme with the proposed activity-based estimation improves the BER performance compared with that without considering voice activity, and it approaches to that of the ideal estimation as the total number of concurrent users increases. In addition, the higher becomes the maximum attainable SNR, the better becomes the BER performance of the proposed activity-based estimation scheme.