Exact outage probability for equal gain combining with cochannel interference in Rayleigh fading

Authors:
Yi Song;S. D. Blostein;Julian Cheng
Affiliations:
Dept. of Electr. & Comput. Eng., Queen's Univ., Kingston, Ont., Canada;-;-
Venue:
IEEE Transactions on Wireless Communications
Year:
2003

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Abstract

Equal gain combining (EGC) diversity has performance close to that of maximal ratio combining but at lower implementation complexity. We present a new outage performance analysis for EGC in mobile cellular radio systems that are limited by cochannel interference and undergo Rayleigh fading. We utilize a new model where interfering signals add in amplitude and phase across antenna array elements. In addition, the interfering signals may each have a different power. In comparing our analysis to an existing method, we find that: 1) as much as 1.5 dB difference in signal-to-interference ratio may exist at the same probability of outage; 2) the existing method can lead to overly optimistic outage performance prediction in certain situations.