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A near-optimal multiuser detector for DS-CDMA systems using semidefinite programming relaxation

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3 Author(s)
Wang, X.M. ; Dept. of Electr. & Comput. Eng., Victoria Univ., BC, Canada ; Lu, W.-S. ; Antoniou, A.

A multiuser detector for direct-sequence code-division multiple-access systems based on semidefinite programming (SDP) is proposed. It is shown that maximum likelihood (ML) detection can be carried out by "relaxing" the associated integer programming problem to a dual SDP problem, which leads to a detector of polynomial complexity. Computer simulations that demonstrate that the proposed detector offers near-optimal performance with considerably reduced computational complexity compared with that of existing primal-SDP-relaxation based detectors are presented.

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Signal Processing, IEEE Transactions on  (Volume:51 ,  Issue: 9 )