Average Output SINR of Equal-Gain Diversity in Correlated Nakagami-m Fading with Cochannel Interference

Abstract—In mobile radio systems, antenna diversity is used to combat fading and reduce the impact of cochannel interference. In this paper, we analyze the performance of L-branch equal-gain combining receivers over correlated nonidentically distrib-uted Nakagami-m fading channels, in the presence of multiple identical cochannel interferers and additive white Gaussian noise. The performance criterion considered is the average output signal-to-interference-plus-noise ratio, which is obtained in closed form for both independent and correlative fading. Due to the simple form of the derived expressions, they readily allow numerical evaluation for cases of practical interest. Index Terms—Cochannel interference (CCI), correlative fad-ing, equal-gain combining (EGC), Nakagami-m fading, signal-to-interference-plus-noise ratio (SINR). I