Iterative multiuser receivers for CDMA channels: an EM-based approach

Laurie B. Nelson, H. Vincent Poor

Research output: Contribution to journalArticlepeer-review

133 Scopus citations


Maximum-likelihood detection for the multiuser code-division multiple-access (CDMA) channel is prohibitively complex. This paper considers new iterative multiuser receivers based on the expectation-maximization (EM) algorithm and related, more powerful 'space-alternating' algorithms. The latter algorithms include the SAGE algorithm and a new 'missing parameter' space-alternating algorithm that alternately updates individual parameter components or treats them as probabilistic missing data. Application of these EM-based algorithms to the problem of discrete parameter estimation (i.e., data detection) in the Gaussian multiple-access channel leads to a variety of convergent receiver structures that incorporate soft-decision feedback for interference cancellation and/or sequential updating of iterative bit estimates. Convergence and performance analyzes are based on well-known properties of the EM algorithm and on numerical simulation.

Original languageEnglish (US)
Pages (from-to)1700-1710
Number of pages11
JournalIEEE Transactions on Communications
Issue number12
StatePublished - 1996
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


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