Joint Adaptive Modulation and Distributed Switch-and-Stay for Partial Relay Selection Networks

Vo Nguyen Quoc BAO  Hyung Yun KONG  

IEICE TRANSACTIONS on Communications   Vol.E95-B   No.2   pp.668-671
Publication Date: 2012/02/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.668
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
distributed switch-and-stay combining,  partial relay selection,  adaptive modulation,  

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In this letter, we propose a distributed switch-and-stay combining network with partial relay selection and show that the system spectral efficiency can be improved via adaptive modulation. Analytical expressions for the achievable spectral efficiency and average bit error rate of the proposed system over Rayleigh fading channels are derived for an arbitrary switching threshold. Numerical results are gathered to substantiate the analytical derivation showing that in terms of spectral efficiency, the system with single relay outperforms that with more than one relay at high signal-to-noise ratios (SNRs) and the optimal switching threshold can significantly improve the system performance at medium SNRs.