Impact of outdated channel state information on multiuser cooperative relay networks in co-channel interference environments

This paper considers multiuser cooperative relay networks with user selection at the mobile station, where both the relay and mobile users are corrupted by a finite number of co-channel interferers. We study the impact of the outdated channel state information (CSI) on the system performances over time-varying Rayleigh fading channels by deriving the tight lower bounds for the outage probability and symbol error rate (SER). In further, we derive the asymptotic expressions of the outage probability and SER with high signal-to-interference ratio (SIR). Finally the proposed theoretical studies are verified by the simulation results.