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Mutual Information of IID Complex Gaussian Signals on Block Rayleigh-Faded Channels

机译:块瑞利衰落信道上IID复高斯信号的互信息

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摘要

We present a method to compute, quickly and efficiently, the mutual information achieved by an independent identically distributed (IID) complex Gaussian signal on a block Rayleigh-faded channel without side information at the receiver. The method accommodates both scalar and multiple-input multiple-output (MIMO) settings. Operationally, this mutual information represents the highest spectral efficiency that can be attained using Gaussian codebooks. Examples are provided that illustrate the loss in spectral efficiency caused by fast fading and how that loss is amplified when multiple transmit antennas are used. These examples are further enriched by comparisons with the channel capacity under perfect channel-state information at the receiver, and with the spectral efficiency attained by pilot-based transmission.
机译:我们提出了一种方法,可以快速有效地计算由独立的均匀分布(IID)复高斯信号在块瑞利衰落信道上获得的互信息,而接收机上没有边信息。该方法可容纳标量和多输入多输出(MIMO)设置。在操作上,此互信息表示使用高斯码本可获得的最高频谱效率。提供的示例说明了由快速衰落引起的频谱效率损失,以及当使用多个发射天线时如何放大该损失。通过与接收机处完美信道状态信息下的信道容量以及通过基于导频的传输获得的频谱效率进行比较,可以进一步丰富这些示例。

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