Abstract
The performance of optimum combining (OC) in amplify-and-forward (AF) relaying systems in the presence of co-channel interference (CCI) is analyzed using a tight approximation for the signal-to-interference-plus-noise ratio (SINR) at the destination. Two types of relaying protocols are studied, all-relay transmission with OC and best-relay transmission with OC. When CCI is present only at the destination, both relaying protocols achieve diversity gains up to $M$ when interferer powers are scaled with the source and the relay powers, where $M$ is the number of relays. Best-relay transmission with OC maximizes the spectral efficiency as each communication consumes only two time slots.
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