Low Complexity Hybrid Precoding Strategies for Millimeter Wave Communication Systems
Low Complexity Hybrid Precoding Strategies for Millimeter Wave Communication Systems
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DOI：
10.1109/twc.2016.2614495
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发表时间：
2016-12-01
影响因子：
10.4
通讯作者：
Heath, Robert W., Jr.
中科院分区：
文献类型：
--
作者：
Rusu, Cristian;Mendez-Rial, Roi;Heath, Robert W., Jr.
毫米通信系统使用大型天线阵列来提供良好的平均接收功率并利用多流 MIMO 通信。不幸的是，由于模拟前端的功耗，在基带执行波束成形和全数字预编码是不切实际的。已经提出混合预编码/组合架构来克服这个限制。这种混合结构将 MIMO 处理在数字域和模拟域之间分开，同时保持接近全数字解决方案的性能。在本文中，我们介绍并分析了几种算法，这些算法可以从已知的最佳数字预编码器/组合器开始有效地设计混合预编码器和组合器，当完美的信道状态信息可用时可以计算这些最佳数字预编码器/组合器。我们提出了几种低复杂性的解决方案，它们在性能和复杂性之间提供了不同的权衡。我们表明，所提出的迭代解决方案在频谱效率方面表现更好和/或比文献中以前的方法更快。它们都提供了性能接近已知最佳数字解决方案的设计。最后，我们研究了量化混合设计的模拟组件的效果，并表明即使采用粗量化，平均速率性能也很好。
Millimeter communication systems use large antenna arrays to provide good average received power and to take advantage of multi-stream MIMO communication. Unfortunately, due to power consumption in the analog front-end, it is impractical to perform beamforming and fully digital precoding at baseband. Hybrid precoding/combining architectures have been proposed to overcome this limitation. The hybrid structure splits the MIMO processing between the digital and analog domains, while keeping the performance close to that of the fully digital solution. In this paper, we introduce and analyze several algorithms that efficiently design hybrid precoders and combiners starting from the known optimum digital precoder/combiner, which can be computed when perfect channel state information is available. We propose several low complexity solutions which provide different trade-offs between performance and complexity. We show that the proposed iterative solutions perform better in terms of spectral efficiency and/or are faster than previous methods in the literature. All of them provide designs which perform close to the known optimal digital solution. Finally, we study the effects of quantizing the analog component of the hybrid design and show that even with coarse quantization, the average rate performance is good.