On the Reuse of Shadowed CRs as AF Diversity Relays in Cooperative Spectrum Sensing in Correlated Suzuki Fading Channels

Thai-Mai Thi DINH  Quoc-Tuan NGUYEN  Dinh-Thong NGUYEN  

IEICE TRANSACTIONS on Communications   Vol.E98-B   No.1   pp.116-125
Publication Date: 2015/01/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E98.B.116
Type of Manuscript: Special Section PAPER (Special Section on Quality of Diversifying Communication Networks and Services)
cognitive radio,  cooperative spectrum sensing,  amplify-and-forward diversity relaying,  correlated composite fading,  suzuki fading,  MGF,  

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Most recent work on cooperative spectrum sensing using cognitive radios has focused on issues involving the sensing channels and seemed to ignore those involving the reporting channels. Furthermore, no research has treated the effect of correlated composite Rayleigh-lognormal fading, also known as Suzuki fading, in cognitive radio. This paper proposes a technique for reuse of shadowed CRs, discarded during the sensing phase, as amplified-and-forward (AF) diversity relays for other surviving CRs to mitigate the effects of such fading in reporting channels. A thorough analysis of and a closed-form expression for the outage probability of the resulting cooperative AF diversity network in correlated composite Rayleigh-lognormal fading channels are presented in this paper. In particular, an efficient solution to the “PDF of sum-of-powers” of correlated Suzuki-distributed random variables using moment generating function (MGF) is proposed.