针对使用单个中继节点的多输入多输出(MIMO)中继系统,以极大化接收端各子流的最小信噪比为目标,提出一种线性收发机设计方案。在此方案中,系统中的各节点沿着对应信道的特征方向进行线性信号处理,使等效的MIMO信道被分解为一组并行的高斯信道。通过优化理论,证明了在中继节点处最优的功率分配,应使接收端各子流具有相同的信噪比。
A linear transceiver design method is proposed to maximize the minimal signal-to-noise ratio(SNR) of all sub-streams in MIMO single-relay system. In the proposed strategy, all nodes per- form linear processing along the eigenvectors of the corresponding channel matrix, and the equivalent MIMO channel is then decomposed into a set of parallel Gaussian channels. According to optimization theory, it is proved that the optimal relay-power allocation can be get from equal SNR of all substreams at the receiver.