An Inter-Cell Interference Mitigation Scheme Based on MIMO-Relay Technique

MIMO-relay technology is accepted as a promising solution to improve cell edge performance for the future 4G wireless system. In this paper, an inter-cell interference mitigation scheme based on MIMO-relay technique is proposed to improve the average capacity for cell edge users. In the paper, a new network structure with shared relay station (SRS) is first studied, and a two-tier channel decomposition method is proposed based on the structure; then the BS (base station) precoding and relay filtering scheme is designed based on the proposed method, and the power allocation scheme at SRS is further discussed with two solutions of average power allocation algorithm and genetic based optimization algorithm. Numerical results show that compare with other inter-cell interference mitigation schemes, the proposed scheme can effectively cancel the inter-cell interference and significantly improve the capacity performance for cell edge users.