arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1807.09458eess.SPcs.ETcs.ITmath.IT
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索引调制中的信道相关互信息

Channel Dependent Mutual Information in Index Modulations

Pol Henarejos, Ana Pérez-Neira, Anxo Tato, Carlos Mosquera

摘要:

互信息是用于执行链路自适应的度量,其允许实现接近容量的速率。自适应传输模式的计算是通过使用信噪比和互信息之间的映射来实现的。由于互信息计算的高度复杂性,该过程通过蒙特卡洛模拟离线执行,其结果存储在查找表中。然而,在诸如空间调制或极化调制的索引调制中,这是不可行的,因为星座和互信息是信道相关的,并且如果信道是时变的,则需要在每个时刻计算该度量。在本文中,我们提出了不同的近似,以获得一个简单的封闭形式的表达式,允许计算在每个时刻的互信息,从而使可行的链路自适应。

英文摘要:

Mutual Information is the metric that is used to perform link adaptation, which allows to achieve rates near capacity. The computation of adaptive transmission modes is achieved by employing the mapping between the Signal to Noise Ratio and the Mutual Information. Due to the high complexity of the computation of the Mutual Information, this process is performed off-line via Monte Carlo simulations, whose results are stored in look-up tables. However, in Index Modulations, such as Spatial Modulation or Polarized Modulation, this is not feasible since the constellation and the Mutual Information are channel dependent and it would require to compute this metric at each time instant if the channel is time varying. In this paper, we propose different approximations in order to obtain a simple closed-form expression that allows to compute the Mutual Information at each time instant and thus, making feasible the link adaptation.

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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