Enhancement of SSB capability for multiuser detection in the mismatch environment of receiver spreading code

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. BS incorporating the orthogonal property of spreadi ng codes into the SSB algorithm, the proposed technique not only can correc t the spread-signature mismatch, but also can decorrelate the spreading cod es in asynchronous DS-CDMA system. Significant performance improvement of t he enhanced SSB technique is demonstrated by simulation results.