Performance analysis of one-way relay networks with channel estimation errors and loop-back interference

In this paper, we derive capacity cut-set bounds of half-duplex (HD) and full-duplex (FD) single relay systems in the presence of channel estimation errors and loop-back interference. Next, we propose power allocation technique to maximize the capacity upper bound that is shown to be effective and close to optimum solution. Comparison between FD and HD relaying systems using optimum power allocation is carried out. Simulation results show that depending on SNR values, it is better to tolerate some loop-back interference with the FD relaying rather than to consume channel resources in HD one. In addition, the estimation error effect is more destructive for low power. While, by increasing the transmitted power, the loop-back interference noise dominates the channel estimation error.