MMSE-Based Beamforming Techniques for Relay Broadcast Channels
MMSE-Based Beamforming Techniques for Relay Broadcast Channels
复制标题
基于 MMSE 的中继广播信道波束成形技术
DOI：
10.1109/tvt.2013.2257906
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发表时间：
2013
影响因子：
6.8
通讯作者：
Cumanan K
中科院分区：
文献类型：
--
作者：
Cumanan K
我们提出了基于最小均方误差（MMSE）的多天线中继网络波束成形技术，其中配备多个天线的基站（BS）通过多天线中继与多个单天线用户通信。我们具体解决了三个优化问题，即1)和功率最小化问题，2)均方误差（MSE）平衡问题，以及3)混合服务质量（QoS）问题。不幸的是，这些问题在BS和中继放大矩阵处的波束形成矢量方面并不是联合凸的。为了避免这种非凸性问题，将原问题分解为两个子问题，其中波束形成矢量和中继放大矩阵交替优化，而另一个不变。基于凸优化技术和广义均方误差对偶性，提出了三种迭代算法。仿真结果验证了所提算法的收敛性。
We propose minimum mean square error (MMSE)-based beamforming techniques for a multiantenna relay network, where a base station (BS) equipped with multiple antennas communicates with a number of single-antenna users through a multiantenna relay. We specifically solve three optimization problems, namely, 1) the sum-power minimization problem, 2) the mean-square-error (MSE) balancing problem, and 3) the mixed quality-of-service (QoS) problem. Unfortunately, these problems are not jointly convex in terms of beamforming vectors at the BS and the relay amplification matrix. To circumvent this nonconvexity issue, the original problems are divided into two subproblems, where the beamforming vectors and the relay amplification matrix are alternately optimized, whereas the other is fixed. Three iterative algorithms are developed based on convex optimization techniques and general MSE duality. Simulation results are provided to validate the convergence of the proposed algorithms.