A Decoupling Approach for Low-Complexity Vector Perturbation in Multiuser Downlink Systems
A Decoupling Approach for Low-Complexity Vector Perturbation in Multiuser Downlink Systems
复制标题
多用户下行链路系统中低复杂度矢量扰动的解耦方法
DOI：
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发表时间：
2011
影响因子：
10.4
通讯作者：
Inkyu Lee
中科院分区：
文献类型：
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作者：
Seokhwan Park;Hyeon;Sunho Lee;Inkyu Lee
在这封信中，我们提出了一种有效的算法，该算法通过单独搜索摄动矢量的实分量和虚分量来降低传统矢量摄动格式的复杂性。为了最小化由解耦联合搜索引起的性能损失，我们在发射机上应用对角预编码，其参数被迭代优化以最大化由实分量和虚分量跨越的子空间之间的弦距。我们还提出了一种简单的非迭代方法，具有轻微的性能损失，与传统的矢量摄动方案相比，可以显著降低复杂性。
In this letter, we propose an efficient algorithm which reduces the complexity of conventional vector perturbation schemes by searching the real and imaginary components of a perturbation vector individually. To minimize a performance loss induced from the decoupled joint search, we apply diagonal precoding at the transmitter whose parameters are iteratively optimized to maximize the chordal distance between subspaces spanned by the real and imaginary components. We also propose a simple non-iterative method with a slight performance loss which can achieve a significant complexity reduction compared to the conventional vector perturbation schemes.