中文摘要：

提出一种在2个时隙内对MIMO-AF协作两跳中继信道进行估计的方法.重点研究在信源发送功率和中继发送功率受限的约束条件下,运用MMSE准则构建信源至中继节点信道估计的优化问题,采用矩阵分解的方法将信号分解成酉分量和对角分量,简化代价函数.最后用二分法求出最佳的导频信号和中继放大系数.仿真结果表明,本方法能够得到确定的、精度较高的信道估计值,并分析了信道相关性、天线数目对信道估计的影响.

英文摘要：

A channel estimation method in two time slots for two-hop amplify-aad-forward MIMO relay channels is proposed.An algorithm for computing the optimal pair of source pilot and relay amplify matrix is developed,which minimizes the mean square error of the source-to-relay channel estimation subject to both power constraints at the source and the relay.The signal matrices are decomposed into unitary components and diagonal components.Then the bisection method is used to obtain the optimal diagonal components of the source pilot and the relay amplified matrix.The simulation results show that the proposed method has no ambiguity in the channel estimates.The effects of the channel correlation and the number of antennas on the performance of channel estimation are also analyed.