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2011

Exploiting Sparse User Activity in Multiuser Detection

8 years 6 months ago
Exploiting Sparse User Activity in Multiuser Detection
—The number of active users in code-division multiple access (CDMA) systems is often much lower than the spreading gain. The present paper exploits fruitfully this a priori information to improve performance of multiuser detectors. A lowactivity factor manifests itself in a sparse symbol vector with entries drawn from a finite alphabet that is augmented by the zero symbol to capture user inactivity. The non-equiprobable symbols of the augmented alphabet motivate a sparsity-exploiting maximum a posteriori probability (S-MAP) criterion, which is shown to yield a cost comprising the ℓ2 least-squares error penalized by the
Hao Zhu, Georgios B. Giannakis
Added 15 May 2011
Updated 15 May 2011
Type Journal
Year 2011
Where TCOM
Authors Hao Zhu, Georgios B. Giannakis
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