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arXiv 1504.00847cs.ITmath-phmath.ITmath.MP
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多天线时频相关信道的Shannon互信息:遍历算子方法

The Shannon's mutual information of a multiple antenna time and frequency dependent channel: an ergodic operator approach

Walid Hachem, Aris Moustakas, Leonid Pastur

摘要:

考虑随机非中心多天线无线电传输信道。假设信道的确定性部分本身是频率选择性的,并且随机多径部分由遍历平稳向量过程表示。在希尔伯特空间$l^2({\mathbb Z})$中,可以将具有所谓的积分态密度(IDS)的随机遍历自伴算子与该信道相关联。该信道的每个接收天线的香农互信息则与$\log$函数关于IDS的积分一致。在本文中,它表明,当在发射机和接收机的天线的数量趋于无穷大,在相同的速率,每个接收天线的互信息往往是一个数量,可以识别,事实上,是密切相关的随机矩阵方法内获得的。这个结果可以通过分析在大量天线的情况下IDS的Stieltjes变换的行为来获得。

英文摘要:

Consider a random non-centered multiple antenna radio transmission channel. Assume that the deterministic part of the channel is itself frequency selective, and that the random multipath part is represented by an ergodic stationary vector process. In the Hilbert space $l^2({\mathbb Z})$, one can associate to this channel a random ergodic self-adjoint operator having a so-called Integrated Density of States (IDS). Shannon's mutual information per receive antenna of this channel coincides then with the integral of a $\log$ function with respect to the IDS. In this paper, it is shown that when the numbers of antennas at the transmitter and at the receiver tend to infinity at the same rate, the mutual information per receive antenna tends to a quantity that can be identified and, in fact, is closely related to that obtained within the random matrix approach. This result can be obtained by analyzing the behavior of the Stieltjes transform of the IDS in the regime of the large numbers of antennas.

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