Performance analysis of three-branch selection combining over arbitrarily correlated Rayleigh-fading channels

Authors:
Yunxia Chen;C. Tellambura
Affiliations:
Dept. of Electr. & Comput. Eng., Univ. of Alberta, Edmonton, Alta., Canada;-
Venue:
IEEE Transactions on Wireless Communications
Year:
2005

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Abstract

The recent literature has thoroughly treated two-branch selection combining (SC) over correlated Rayleigh fading and three-branch SC over exponentially correlated Rayleigh fading. However, a long-standing open problem involves the three-branch SC performance over arbitrarily correlated Rayleigh fading. We solve this problem completely by deriving new infinite series expressions for the cumulative distribution function, the probability density function, and the moment generating function (mgf) of the three-branch SC output signal-to-noise ratio (SNR). The output mgf can be used to derive the average symbol-error rate for any two-dimensional digital modulations. The outage probability and the higher moments of the SC output SNR are also derived. These analytical results are canonical, in that the three-branch SC performance is now completely solved for arbitrary correlation. Some previous results are shown to be special cases of our new results.