关键词: 下行多用户, 中继系统, 联合收发机设计

Abstract:

A joint transceiver optimization is proposed for downlink multiuser multiple-input multiple-output (MIMO) relay systems. The proposed method is based on minimum mean-square error criterion. Using high signal-to-noise ratio approximation, the error covariance matrix is decomposed into two individual error matrices, which leads to two simple problems for the optimization, the simple traditional MIMO optimization and the traditional multiuser optimization. Moreover, the closed-form solution of the source precoding matrix can be obtained. The decomposition greatly degrades the complexity of the joint transceiver design and mitigates the feedback overhead. Simulations verify the effectiveness of the proposed method.

Key words: downlink multiuser, relay systems, joint transceiver optimization