Outage Probability of EGC Under Co-Channel Interferers with Arbitrary Powers in Rayleigh Fading

Two tight closed-form approximated expressions for the outage probability of equal-gain combining (EGC) are presented for the case of co-channel interferers with arbitrary powers in Rayleigh fading. A recent exact expression for the outage probability is extended to account for arbitrary power interferers for the sake of comparison. Comparisons between this new approach and the exact solution for EGC show excellent agreement. Contrary to most previous works in the subject, our analysis is suitable for performance evaluation of power controlled multi-cell networks, in which in-cell users are received with equal average powers and other cell-users are received with different average powers. In addition, we provide a comparison of outage probability for EGC, maximal ratio combining (MRC) and selection combining (SC) for arbitrary power interferers.