Average SNR of Generalized Selection Combining over Nakagami-m Fading Channels

Chi Ming LO  Wong-Hing LAM  

IEICE TRANSACTIONS on Communications   Vol.E84-B   No.7   pp.1952-1955
Publication Date: 2001/07/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technology
generalized selection combining,  maximal ratio combining,  selection combining,  Nakagami-m fading,  average signal-to-noise ratio,  

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Using moment generating function (MGF) of generalized selection combining (GSC) output signal-to-noise ratio (SNR), we derive closed-form expressions for average combined SNR at the output of GSC, which optimally combines the N largest out of L available diversity signals, over Nakagami-m fading channels for N = 2, 3 and L = 4. The Nakagami-m fading statistics on each diversity branch are assumed to be independent and identically distributed (i.i.d.). The average combined SNRs at the outputs of GSC receivers are also compared with the average combined SNRs at the outputs of conventional maximal ratio combining (MRC) and selection combining (SC).