Channel estimation for an OFDM-based amplify-and-forward relay system in the presence of co-channel interference

In this paper, we consider an OFDM-based amplify-and-forward forward (AF) relay system with multiple co-channel interferences (CCIs). On the premise of severe synchronous CCIs in both the data and pilot subcarriers, we propose an iterative method for pilot-aided channel estimation. Simulation results show that when multiple CCIs are in existence, our proposed method can effectively estimate the channel state information (CSI) of the equivalent channel and interference channel and the equivalent noise variance, and its mean square error (MSE) performance is as good as the traditional linear minimum mean square error (LMMSE) estimation, with the advantage of the lower complexity.