A channel estimation scheme for AF-based two-path relay cooperative networks

Compared with the conventional AF-based single-relay cooperative networks, there is nearly double spectrum efficiency in the AF-based two-path relay cooperative networks. However, there are few channel estimation methods for that. In this paper, we propose this channel estimation scheme. Firstly, we find the necessary channel state information (CSI) based on the FIC (full interference cancelation) algorithm and then propose an effective channel estimation scheme, including the pilot scheme and the corresponding channel estimation method. And secondly we analyze the impact of the amplifying factors in relays, and find there are optimum values for them, and verify our analysis by simulation. At last, simulation results demonstrate the improvement on BER performance.