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In this paper, the authors 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. They 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. They then extend the analysis for the general case with unequal-power interferers. Using majorization theory, they show that in terms of outage probability, the worst scenario appears if the interferers are of equal power, for a given total interference power.
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