Multiuser Detection for MC-CDMA System Using an RQP Approach

Xianmin WANG
Zhiwei MAO

Publication
IEICE TRANSACTIONS on Communications   Vol.E88-B    No.11    pp.4394-4397
Publication Date: 2005/11/01
Online ISSN: 
DOI: 10.1093/ietcom/e88-b.11.4394
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
quadratic programming,  recursive approach,  multiuser detection,  M-ary modulation,  MC-CDMA,  

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Summary: 
A recursive quadratic programming (RQP) approach is proposed for multiuser detection in multicarrier code-division multiple-access (MC-CDMA) systems. In this approach, the combinatorial problem associated with the optimal maximum likelihood (ML) detection is relaxed to a quadratic programming (QP) problem first and then a recursive approach is developed to improve the detection performance. Computer simulations are presented which demonstrate that the detector developed based on the proposed approach offers close-to-optimal symbol-error rate (SER) performance which outperforms several existing suboptimal detectors.