Robust MCMV Multiuser Detection Using Variable Diagonal Loading Technique under Spreading Code Mismatch

Ann-Chen CHANG  

IEICE TRANSACTIONS on Communications   Vol.E92-B   No.9   pp.2958-2960
Publication Date: 2009/09/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.2958
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
CDMA,  MCMV,  diagonal loading,  spreading code mismatch,  multiuser detection,  

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It is well known that the performance of CDMA systems may degrade in the presence of spreading code mismatch. The diagonal loading multiple constrained minimum variance (DL-MCMV) approaches have been proposed to deal with the mismatch problem. However, they still cannot improve the robust capability efficiently due to the spreading code mismatch. In this letter, a detector based on the variable DL technique is presented that offers more robust capabilities than the MCMV and DL-MCMV detectors. Computer simulation results are provided that illustrate the effectiveness of the proposed detector.