Joint MMSE Transceiver Design for MIMO Amplify-and-Forward Relay Systems with Multiple Relays
Joint MMSE Transceiver Design for MIMO Amplify-and-Forward Relay Systems with Multiple Relays
复制标题
具有多个中继的 MIMO 放大转发中继系统的联合 MMSE 收发器设计
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Inkyu Lee
中科院分区：
文献类型：
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作者：
Eunsung Park;Kyoung;Inkyu Lee
本文研究了在源节点和目的节点之间具有多个中继节点的放大转发中继系统，其中所有节点都配备有多个天线。使用多个中继节点发送消息，可以获得分布式分集增益。在本文中，我们解决的继电器加权矩阵的优化问题，最大限度地减少均方误差（MSE）。对于具有任意数目中继节点的一般中继系统，所给问题具有非凸的代价函数。因此，我们提出了一种迭代方案，该方案通过推导MSE的梯度并应用梯度下降算法来识别局部最优中继预编码器。仿真结果表明，与传统的多MIMO中继系统相比，该迭代方案迭代次数少，在均方误差和误比特率方面都有较好的性能。
This paper considers amplify-and-forward (AF) relaying systems with multiple relay nodes between the source and the destination node, where all nodes are equipped with multiple antennas. Using multiple relay nodes to transmit a message, a distributed diversity gain can be obtained. In this paper, we address the optimization problem of relay weighting matrices which minimizes the mean-square-error (MSE). For general relaying systems which have an arbitrary number of relay nodes, the given problem has a non-convex cost function. Thus, we propose an iterative scheme which identifies a local optimal relay precoder by deriving the gradient of the MSE and applying the gradient descent algorithm. Simulation results show that the proposed iterative scheme outperforms the conventional schemes for multiple MIMO relay systems with a small number of iterations in terms of both the MSE and the bit error rate.