Outage Probability of Dual-Hop Relay Channels in the Presence of Interference

In this paper, we address the performance of a dual- hop relay fading channel in an interference-limited environment, in which the destination node is corrupted by co-channel interference while the relay node is perturbed by only an additive white Gaussian noise. We first investigate the scenario with equal-power interferers, under which the analytical expressions for the outage probability of both the amplify-and-forward (AF) and the decode-and-forward (DF) relay channels are derived in closed form. We then extend the analysis for the general case with unequal-power interferers. Using majorization theory, we show that in terms of outage probability, the worst scenario appears if the interferers are of equal power, for a given total interference power.