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arXiv 1702.07657cs.ITmath.IT
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受限AWGN自由空间通信信道的容量

Capacity of the Aperture-Constrained AWGN Free-Space Communication Channel

Richard J. Barton

摘要:

在本文中,我们推导出上限和下限,以及一个简单的封闭形式的近似能力的连续时间,带限,加性高斯白噪声信道在三维自由空间电磁传播环境的约束下的总有效天线孔径面积的链路和总发射机功率约束。我们假设,通信范围是远远大于半径的球包含在两端的链路的天线,我们表明,在一般情况下,只能通过传输多个空间复用的数据流同时在信道上实现的容量。此外,通过在链路的任一端的一对物理上可实现的分布式天线阵列之间传输数据流,可以渐近地接近容量的下限。该结果的结果是,通常,当且仅当通信系统利用分布式MIMO天线阵列上的空间复用时,在实践中可以实现在深空通信链路上接近最大可实现数据率的通信。目前,任何国际空间机构或任何商业空间公司似乎都没有设想过这种深空通信方法。第二个结果是,远程自由空间通信链路的容量如果被适当地利用,则作为接收到的SNR的平方根的函数而渐进地增长,而不是仅在接收到的SNR中以几何方式增长。

英文摘要:

In this paper, we derive upper and lower bounds as well as a simple closed-form approximation for the capacity of the continuous-time, bandlimited, additive white Gaussian noise channel in a three-dimensional free-space electromagnetic propagation environment subject to constraints on the total effective antenna aperture area of the link and a total transmitter power constraint. We assume that the communication range is much larger than the radius of the sphere containing the antennas at both ends of the link, and we show that, in general, the capacity can only be achieved by transmitting multiple spatially-multiplexed data streams simultaneously over the channel. Furthermore, the lower bound on capacity can be approached asymptotically by transmitting the data streams between a pair of physically-realizable distributed antenna arrays at either end of the link. A consequence of this result is that, in general, communication at close to the maximum achievable data rate on a deep-space communication link can be achieved in practice if and only if the communication system utilizes spatial multiplexing over a distributed MIMO antenna array. Such an approach to deep-space communication does not appear to be envisioned currently by any of the international space agencies or any commercial space companies. A second consequence is that the capacity of a long-range free-space communication link, if properly utilized, grows asymptotically as a function of the square root of the received SNR rather than only logarithmically in the received SNR.

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