MIMO-OFDM non-regenerative relay channel estimation using compressed sensing

In this paper, a compressed sensing (CS)-based channel estimation technique is developed for MIMO-OFDM networks with Amplify-and-Forward (AF) relaying method. The impacts of multiple antennas as well as existing a direct link between source and destination are studied. The proposed CS-based method utilizes the inherent sparse characteristic of wireless channel and improves the bandwidth efficiency as it requires a few measurement units for channel estimation. The simulation results show that the proposed CS-based method outperforms the Least Squares (LS)-based channel estimation.