Near Optimum Detector for DS-CDMA System Using Particle Swarm Optimization

Muhammad A. S. CHOUDHRY  Muhammad ZUBAIR  Aqdas NAVEED  Ijaz M. QURESHI  

IEICE TRANSACTIONS on Communications   Vol.E90-B   No.11   pp.3278-3282
Publication Date: 2007/11/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.11.3278
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
direct sequence code-division multiple access,  particle swarm optimization,  multiuser detection,  

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The computational complexity of the optimum maximum likelihood detector (OMLD) does not allow its utility for multi-user detection (MUD) in code division multiple access (CDMA) systems. As proposed in this letter, particle swarm optimization (PSO) with soft decision offers a much more efficient option with few parameters to be adjusted, flexibility to implement, that gives a much faster convergence compared to OMLD. It outperforms the conventional detector, the genetic algorithm approach and the standard suboptimal detectors considered in the literature.