Efficient Channel Estimation Algorithm for Two-Way MIMO Relay Systems

To solve the problem of joint channel estimation for two-way multiple-input multiple-output (MIMO) relay systems, we propose a low complexity algorithm in this paper. At each user, the proposed channel estimation algorithm uses a unified formulation of the received signal as a Tucker-2 model. A joint channel estimation process is derived out by resorting to the proposed low complexity iterative algorithm. The proposed algorithm can provide each user with full knowledge of all channel matrices in the considering communication system. Moreover, the proposed algorithm can estimate channel effectively even when the channel becomes strongly correlated. Simulation results demonstrate the effectiveness of the proposed algorithm.