Interference is usually viewed as an obstacle for any communication network. In this paper, performance of an amplify-and-forward (AF) relay network is analyzed when interference is present at the relay. It is assumed that no obstacles are located between interferes and the relay, thus line-of-sight (LOS) interference is possible. We consider the general case of distributed interferers with arbitrary power. To evaluate the performance, we derive the exact closed form expression for outage probability and a tight bound to the average symbol error rate (SER). In order to understand the depth of the system performance, we analyze the system in high signal to noise ratio (SNR) and derive simple asymptotic results for outage probability and average SER. Monte Carlo simulations are performed to verify the analytical results.
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