Interference alignment at finite SNR for time-invariant channels

Or Ordentlich, Uri Erez

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

A time-invariant (constant channel gains) K-user interference channel is considered, where all interference (cross) channel gains are integers. For such channels, previous results demonstrate that the number of degrees of freedom is very sensitive to slight variations in the direct channel gains. In this paper we derive an achievable rate region for such channels which is valid for finite SNR. At moderate values of SNR the derived rate region is robust to slight variations in the direct channel gains. At asymptotic high SNR conditions, the known results on the degrees of freedom are recovered. The new rate region is based on lattice interference alignment. The result is established via a new coding theorem for the two-user Gaussian multiple-access channel where both users use a single linear code.

Original languageEnglish
Title of host publication2011 IEEE Information Theory Workshop, ITW 2011
Pages442-446
Number of pages5
DOIs
StatePublished - 2011
Event2011 IEEE Information Theory Workshop, ITW 2011 - Paraty, Brazil
Duration: 16 Oct 201120 Oct 2011

Publication series

Name2011 IEEE Information Theory Workshop, ITW 2011

Conference

Conference2011 IEEE Information Theory Workshop, ITW 2011
Country/TerritoryBrazil
CityParaty
Period16/10/1120/10/11

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