On the mutual information of cognitive relay assisted Rayleigh fading MIMO channel

Md Z I Sarkar, Tharmalingam Ratnarajah, Mathini Sellathurai

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

Abstract / Description of output

In this paper, we study a Multiple-Input Multiple-Output (MIMO) communication scenario through Rayleigh fading cognitive radio channel in which two users, called the primary and the secondary users wish to communicate with two different receivers, in the presence of a cognitive relay. We assume that the secondary user transmits simultaneously with the primary user over the same channel instead of waiting for an idle channel which is traditional for a cognitive radio. The cognitive relay has access to the messages transmitted by both the users and assists them in communicating the messages successfully to their respective destinations. We address the problem of analyzing fading MIMO cognitive relay channels and derive the expressions for mutual information received at the primary and secondary receivers in both the cases when cognitive relay is present or not. We focus on the investigation of outage behavior of proposed model. Our results show that in the presence of cognitive relay, not only both the primary and secondary users are able to communicate with corresponding receivers compensating interferences created at their receivers, but also the outage performance of primary and secondary users are improved due to the additional diversity obtained via relaying.

Original languageEnglish
Title of host publicationProceedings - 2009 1st UK-India International Workshop on Cognitive Wireless Systems, UKIWCWS 2009
DOIs
Publication statusPublished - 1 Dec 2009
Event2009 1st UK-India International Workshop on Cognitive Wireless Systems, UKIWCWS 2009 - New Delhi, United Kingdom
Duration: 11 Dec 200912 Dec 2009

Conference

Conference2009 1st UK-India International Workshop on Cognitive Wireless Systems, UKIWCWS 2009
Country/TerritoryUnited Kingdom
CityNew Delhi
Period11/12/0912/12/09

Keywords / Materials (for Non-textual outputs)

  • Cognitive relay
  • cognitive user
  • complementary cumulative distribution function (CCDF)
  • outage mutual information
  • Rayleigh fading MIMO cognitive radio channel

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