Enhancement of SSB Capability for Multiuser Detection in the Mismatch Environment of Receiver Spreading Code

Ching-Tai CHIANG  Ann-Chen CHANG  Yuan-Hwang CHEN  

IEICE TRANSACTIONS on Communications   Vol.E83-B   No.12   pp.2709-2711
Publication Date: 2000/12/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technology
CDMA,  multiuser detector,  subspace-based technique,  

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This letter deals with multiuser detection under imprecise knowledge of the received signature code of desired user. In order to improve the revision capability for spread-signature mismatch, an enhanced subspace-based (SSB) technique is developed. By incorporating the orthogonal property of spreading codes into the SSB algorithm, the proposed technique not only can correct the spread-signature mismatch, but also can decorrelate the spreading codes in asynchronous DS-CDMA system. Significant performance improvement of the enhanced SSB technique is demonstrated by simulation results.