MMSE-Based MIMO Cooperative Relaying Systems: Closed-Form Designs and Outage Behavior
MMSE-Based MIMO Cooperative Relaying Systems: Closed-Form Designs and Outage Behavior
复制标题
基于 MMSE 的 MIMO 协作中继系统：封闭式设计和中断行为
DOI：
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发表时间：
2012
影响因子：
16.4
通讯作者：
Inkyu Lee
中科院分区：
文献类型：
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作者：
Changick Song;Kyoung;Inkyu Lee
本文研究了信源和信宿之间存在不可忽略直接链路的基于最小均方误差(MMSE)的放大转发协作多天线中继系统。首先，我们提出了一种新的优化继电放大矩阵的设计策略。与传统的依赖迭代梯度法的优化设计方法不同，我们提出了一种近似最优的闭式解，提供了一种洞察力。由于具有直接链路的中继系统一般都是一个非凸问题，我们利用了误差协方差矩阵的可分解性质和一种对问题施加结构约束的松弛技术。接下来，我们利用分集-复用折衷分析研究了所提出方案的误码性能极限，这在基于MMSE的协作中继系统中得到了一些有趣的观察结果。最后，通过数值仿真，我们证实了所提出的解决方案的性能非常接近最优，并且大大降低了复杂度，并且分析结果与仿真结果非常吻合。
In this paper, we investigate minimum mean squared error (MMSE) based amplify-and-forward cooperative multiple antenna relaying systems where a non-negligible direct link exists between the source and the destination. First, we provide a new design strategy for optimizing the relay amplifying matrix. Instead of conventional optimal design approaches resorting to an iterative gradient method, we propose a near optimal closed-form solution which provides an insight. As relay systems with a direct link incur a non-convex problem in general, we exploit the decomposable property of the error covariance matrix and a relaxation technique imposing a structural constraint on the problem. Next, we study the error performance limit of the proposed scheme using diversity-multiplexing tradeoff analysis, which leads to several interesting observations on MMSE-based cooperative relaying systems. Finally, through numerical simulations, we confirm that the proposed solution shows the performance very close to the optimum with much reduced complexity and the analysis closely matches with simulation results.