Rate optimal limited feedback policies for the MIMO downlink

Hazer Inaltekin*, Tharaka Samarasinghe, Jamie S. Evans

*Corresponding author for this work

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

4 Citations (Scopus)

Abstract

This paper introduces and solves the sum rate maximization problem at the multiple-input multiple-output (MIMO) downlink as a function optimization problem subject to feedback constraints at the uplink. It is first shown that this optimization problem can be reduced to a finite dimensional non-convex optimization problem. Then, the resulting problem can be solved by investigating Schur-concavity of the aggregate communication rate across multiple traffic flows. Necessary and sufficient conditions for the rate optimality of homogenous threshold feedback policies are established. With some surprise, it is shown that homogenous thresholding is not always rate-wise optimal even if mobile users experience the same channel conditions statistically. Applications of these results are illustrated for Rayleigh fading channels.

Original languageEnglish
Title of host publication2011 International Symposium of Modeling and Optimization of Mobile, Ad Hoc, and Wireless Networks
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages294-299
Number of pages6
ISBN (Electronic)9781612848242, 9781612848235
ISBN (Print)9781612848228
DOIs
Publication statusPublished - 2011
Externally publishedYes
Event2011 International Symposium of on Modeling and Optimization of Mobile, Ad Hoc, and Wireless Networks, WiOpt 2011 - Princeton, NJ, United States
Duration: 9 May 201113 May 2011

Conference

Conference2011 International Symposium of on Modeling and Optimization of Mobile, Ad Hoc, and Wireless Networks, WiOpt 2011
CountryUnited States
CityPrinceton, NJ
Period9/05/1113/05/11

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