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Stopping criterion for complexity reduction of sphere decoding

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<mark>Journal publication date</mark>1/06/2009
<mark>Journal</mark>IEEE Communications Letters
Issue number6
Volume13
Number of pages3
Pages (from-to)402-404
Publication statusPublished
Original languageEnglish

Abstract

Maximum-likelihood detection in MIMO communications amounts to solving a least-squares problem with a constellation (alphabet) constraint. One popular method that can be used to solve this problem is sphere decoding. We show in this letter that by employing a simple stopping criterion, it is possible to significantly reduce the complexity of sphere decoding over a wide range of SNRs, without a noticeable performance degradation. Specifically, simulation results demonstrate that a 10%-90% reduction of the average complexity could be achieved.