Exploiting Sparse User Activity in Multiuser Detection

  title={Exploiting Sparse User Activity in Multiuser Detection},
  author={Hao Zhu and Georgios B. Giannakis},
  journal={IEEE Transactions on Communications},
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 low-activity 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… CONTINUE READING
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