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A semidefinite programming (SDP) relaxation approach is proposed to solve multiuser detection problems in systems with M-ary quadrature amplitude modulation (M-QAM). In the proposed approach, the optimal M-ary maximum likelihood (ML) detection is carried out by converting the associated M-ary integer programming problem into a binary integer programming problem. Then a relaxation approach is adopted to convert the binary integer programming problem into an SDP problem. This relaxation process leads to a detector of much reduced complexity. A multistage approach is then proposed to improve the performance of the SDP relaxation based detectors. Computer simulations demonstrate that the symbol-error rate (SER) performance offered by the proposed multistage SDP relaxation based detectors outperforms that of several existing suboptimal detectors.
Published in:
Wireless Communications, IEEE Transactions on
(Volume:6
,
Issue:
12
)
Date of Publication: December 2007
- Page(s):
- 4275 - 4279
- ISSN :
- 1536-1276
- INSPEC Accession Number:
- 9700034
- Digital Object Identifier :
- 10.1109/TWC.2007.060418
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 10 December 2007
- Issue Date :
- December 2007
- Sponsored by :
- IEEE Communications Society
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