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arXiv 1705.00538cs.ITmath.IT
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大容量MIMO具有无限容量

Massive MIMO has Unlimited Capacity

Emil Björnson, Jakob Hoydis, Luca Sanguinetti

摘要:

蜂窝网络的容量可以通过Massive MIMO提供的前所未有的阵列增益和空间复用来提高。从一开始,由于导频污染引起的相干干扰就被认为会产生有限的容量限制,因为天线的数量会达到无穷大。在本文中,我们证明,这是不正确的,从使用简单的信道模型和次优预编码/组合方案的工件。我们表明,多小区MMSE预编码/组合和少量的空间信道相关性或大规模的衰落变化的阵列,容量增加,没有约束的天线数量的增加,即使在导频污染。更准确地说,当污染用户的信道协方差矩阵是渐近线性独立的,这是通常的情况下,该结果成立。如果协方差矩阵的对角线也是线性无关的,那么知道这些对角线(而不是完整的协方差矩阵)就足以实现无限的渐近容量。

英文摘要:

The capacity of cellular networks can be improved by the unprecedented array gain and spatial multiplexing offered by Massive MIMO. Since its inception, the coherent interference caused by pilot contamination has been believed to create a finite capacity limit, as the number of antennas goes to infinity. In this paper, we prove that this is incorrect and an artifact from using simplistic channel models and suboptimal precoding/combining schemes. We show that with multicell MMSE precoding/combining and a tiny amount of spatial channel correlation or large-scale fading variations over the array, the capacity increases without bound as the number of antennas increases, even under pilot contamination. More precisely, the result holds when the channel covariance matrices of the contaminating users are asymptotically linearly independent, which is generally the case. If also the diagonals of the covariance matrices are linearly independent, it is sufficient to know these diagonals (and not the full covariance matrices) to achieve an unlimited asymptotic capacity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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