Performance Analysis of AF Cooperative Networks with Nth User Selection over Rayleigh Fading Channel

Xuefang LIU  Qinghai YANG  Fenglin FU  

IEICE TRANSACTIONS on Communications   Vol.E94-B    No.8    pp.2423-2426
Publication Date: 2011/08/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.2423
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
cooperative communications,  amplify-and-forward (AF) relaying,  Nth-user selection,  Rayleigh fading,  

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In this letter, we investigate the Nth-best user selection scheme for amplify-and-forward cooperative systems over Rayleigh fading channels. We deduce the probability density function, the cumulative density function, and the moment generating function of the end-to-end signal-to-noise ratio of the system. Then, the respective closed-form expressions of the average symbol error probability and the outage probability at the destination are derived. The diversity order obtained in the scheme increases with user number but becomes less as the selection sequence number N increases. Simulation results verify the analytical results.