Cooperative multiuser MIMO precoding design for asynchronous interference mitigation

In this paper, we consider a cooperative multiuser wireless cellular system under multipath fading channels. All base stations (BSs) and mobile stations (MSs) are equipped with multiple antennas. The multiuser interference in such a system is inherently asynchronous due to different path distance of BS to MSs. Theoretically we can at best synchronize the desired signal component but not the interference components. We propose a new precoding design in order to curb the impact of asynchronicity of interference, and the effect of interference is mitigated by introducing second-order statistics of interference into the linear precoding design. It has been shown that the proposed design improves the system performance significantly and outperforms Joint Wiener Filtering scheme consistently. Intensive simulations have been conducted to demonstrate its superior performance.