Outage Minimization with Limited Feedback for the Fading Relay Channel

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dc.citation.bibtexNamearticleen_US
dc.citation.journalTitleIEEE Transactions on Communicationsen_US
dc.contributor.authorAhmed, Nasiren_US
dc.contributor.authorKhojastepour, Mohammaden_US
dc.contributor.authorSabharwal, Ashutoshen_US
dc.contributor.authorAazhang, Behnaamen_US
dc.contributor.orgCenter for Multimedia Communications (http://cmc.rice.edu/)en_US
dc.date.accessioned2007-10-31T00:33:48Z
dc.date.available2007-10-31T00:33:48Z
dc.date.issued2006
dc.date.modified2005-11-30en_US
dc.date.submitted2005-04-12en_US
dc.descriptionJournal Paperen_US
dc.description.abstractIn this work, we consider practical methods to approach the theoretical performance limits in the fading relay channel under different assumptions of transmitter channel knowledge. Specifically, we consider two degrees of transmitter channel knowledge: (i) perfect feedback is available and power control is employed, and (ii) no channel state knowledge is available at the transmitters and only spatial power allocation is possible. First, when perfect feedback is available, the optimal power control policy determines the ultimate limits of performance for constant rate transmission in the slow fading environment. However, in practice, perfect channel knowledge is not possible at the transmitters due to the finite capacity of the feedback links. We find practical methods to approach this performance limit through the use of power control with finite rate feedback. The finite rate feedback results are shown for the low complexity, full diversity amplify-and-forward(AF) protocol. Interestingly, we see that only a few feedback bits are needed to achieve most of the gains of the optimal perfect feedback power control algorithm. Second, we consider the performance limit when the transmitters have no channel state knowledge, and derive the optimal spatial power allocation between the source and relay for a given sum power constraint for the AF protocol. For most practical cases of interest, equal power allocation between the source and relay is shown to be nearly optimal. Our work suggests that there is minimal power savings from using spatial power allocation at the transmitters. To obtain large performance improvements over constant power transmission, it is imperative to have feedback for each realization of the channel state to allow for temporal power control.en_US
dc.description.sponsorshipNokiaen_US
dc.identifier.citationN. Ahmed, M. Khojastepour, A. Sabharwal and B. Aazhang, "Outage Minimization with Limited Feedback for the Fading Relay Channel," <i>IEEE Transactions on Communications,</i> 2006.
dc.identifier.doihttp://dx.doi.org/10.1109/TCOMM.2006.873074en_US
dc.identifier.urihttps://hdl.handle.net/1911/19665
dc.language.isoeng
dc.subjectRelay channel*
dc.subjectLimited feedback*
dc.subjectBlock fading*
dc.subjectPower control*
dc.subject.keywordRelay channelen_US
dc.subject.keywordLimited feedbacken_US
dc.subject.keywordBlock fadingen_US
dc.subject.keywordPower controlen_US
dc.titleOutage Minimization with Limited Feedback for the Fading Relay Channelen_US
dc.typeJournal article
dc.type.dcmiText
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