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In this paper, we consider a dual-hop Multiple Input Multiple Output (MIMO)wireless multi-relay network, in which a source-destination pair both equippedwith multiple antennas communicates through multiple half-duplexamplify-and-forward (AF) relay terminals which are also with multiple antennas.Since perfect channel state information (CSI) is difficult to obtain inpractical multi-relay network, we consider imperfect CSI for all channels. Wefocus on maximizing the signal-to-interference-plus-noise ratio (SINR) at thedestination. We propose a novel robust linear beamforming at the relays, basedon the QR decomposition filter at the destination node which performssuccessive interference cancellation (SIC). Using Law of Large Number, weobtain the asymptotic rate in the presence of imperfect CSI, upon which, theproposed relay beamforming is optimized. Simulation results show that theasymptotic rate matches with the ergodic rate well. Analysis and simulationresults demonstrate that the proposed beamforming outperforms the conventionalbeamforming schemes for any power of CSI errors and SNR regions.

Relay Beamforming Design with SIC Detection for MIMO Multi-Relay Networks with Imperfect CSI