The MIMO relay channel in the presence of keyhole effects

Oussama Souihli, Tomoaki Ohtsuki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

A MIMO keyhole is a propagation environment such that the channel gain matrix has unit rank (single degree of freedom), irrespective of the number of deployed antennas or their correlations (spacing), thereby reducing the MIMO channel capacity to that of a SISO channel. Related literature seems to consider such degeneration hopeless. Contrary to this general belief, this paper demonstrates that cooperative diversity can mitigate keyhole effects. Precisely, provided that the source-relay channel is keyhole-free, we show that there exists a "cutoff" relay transmit power above which keyhole effects can be mitigated even when both the source-destination and the relay-destination channels incur keyhole effect. Furthermore, assuming Rayleigh fading, the devised closed form of this power threshold is found to be independent of the channel gain matrices, thereby applying to situations where channel state information (CSI) is unreliable or unavailable at the transmitters. Numerical examples confirm the relevance of our claims.

Original languageEnglish
Title of host publication2010 IEEE International Conference on Communications, ICC 2010
DOIs
Publication statusPublished - 2010 Aug 13
Event2010 IEEE International Conference on Communications, ICC 2010 - Cape Town, South Africa
Duration: 2010 May 232010 May 27

Publication series

NameIEEE International Conference on Communications
ISSN (Print)0536-1486

Other

Other2010 IEEE International Conference on Communications, ICC 2010
CountrySouth Africa
CityCape Town
Period10/5/2310/5/27

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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  • Cite this

    Souihli, O., & Ohtsuki, T. (2010). The MIMO relay channel in the presence of keyhole effects. In 2010 IEEE International Conference on Communications, ICC 2010 [5502776] (IEEE International Conference on Communications). https://doi.org/10.1109/ICC.2010.5502776