Ergodic interference alignment with noisy channel state information
Ergodic interference alignment with noisy channel state information
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DOI：
10.1109/isit.2013.6620293
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发表时间：
2013-07
期刊：
影响因子：
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通讯作者：
H. Farhadi;M. N. Khormuji;Chao Wang;M. Skoglund
中科院分区：
文献类型：
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作者：
H. Farhadi;M. N. Khormuji;Chao Wang;M. Skoglund
我们研究了时变高斯干扰信道（IC）中，每个源的期望通信到一个预定的目的地。对于在所有终端具有全局完美CSI的遍历时变IC，已知利用干扰对准技术，每个源-目的地对可以以无干扰可实现速率的一半进行通信。实际上，信道增益是通过从信源发送已知的导频符号来估计的，因此信道估计过程容易出错。在本文中，我们建立了一个独立的加性高斯噪声的信道估计误差在目的地和研究的行为遍历干扰对齐计划与全球噪声CSI在所有终端。为此，我们提出了一个封闭形式的内界上的可实现的速率区域，我们得出结论，可实现的自由度与全球完美的CSI可以保存，如果信道估计误差的方差是成正比的发射功率的倒数。
We investigate the time-varying Gaussian interference channel (IC) in which each source desires to communicate to an intended destination. For the ergodic time-varying IC with global perfect CSI at all terminals, it has been known that with an interference alignment technique each source-destination pair can communicate at half of the interference-free achievable rate. In practice, the channel gains are estimated by transmitting known pilot symbols from the sources, and the channel estimation procedure is hence prone to errors. In this paper, we model the channel estimation error at the destinations by an independent additive Gaussian noise and study the behavior of the ergodic interference alignment scheme with the global noisy CSI at all terminals. Toward this end, we present a closed-form inner bound on the achievable rate region by which we conclude that the achievable degrees of freedom with global perfect CSI can be preserved, if the variance of channel estimation error is proportional to the inverse of the transmitted power.