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Can channel output feedback enhance the secrecy capacity of the finite state Markov wiretap channel with delayed state feedback?

机译:可以引起有限状态马尔可夫Wiretap通道的延迟状态反馈的秘密容量提高了有限状态的保密容量吗?

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Viswanathan has shown that the practical mobile communication system can be modeled as the finite state Markov channel (FSMC) with delayed feedback, where the receiver perfectly knows the channel state information (CSI) which undergoes a Markov process, and the receiver sends the CSI and his own channel output back to the transmitter after some time delay. Viswanathan found that the delayed feedback of the channel output does not help to increase the capacity of the FSMC with only delayed state feedback. Does this still holds when an additional eavesdropper is considered? In order to answer this question, in this paper, we study the finite state Markov wiretap channel (FSM-WC) with delayed feedback, where the CSI is perfectly known by the legitimate receiver and the eavesdropper, and the legitimate receiver sends the CSI and his own channel output back to the transmitter after some time delay. Inner and outer bounds on the secrecy capacity of this model are provided, and we show that these bounds meet if the eavesdropper's received channel output is a degraded version of the legitimate receiver's. Furthermore, we find that the legitimate receiver's delayed channel output feedback helps to enhance the secrecy capacity of the degraded FSM-WC with only delayed state feedback.
机译:Viswanathan表明,实用的移动通信系统可以用具有延迟反馈的有限状态马尔可夫信道(FSMC)建模,其中接收器完全了解经过马尔可夫过程的信道状态信息(CSI),并且接收器发送CSI和在一段时间延迟后,他自己的频道输出回发射器。 Viswanathan发现通道输出的延迟反馈没有帮助增加FSMC的容量,只有延迟状态反馈。当考虑额外的窃听器时,这仍然持有吗?为了回答这个问题,在本文中,我们研究了具有延迟反馈的有限状态马尔可夫丝网通道(FSM-WC),其中CSI是由合法接收器和窃听者完全熟知的,并且合法接收器发送CSI和在一段时间延迟后,他自己的频道输出回发射器。提供了本型号的保密容量的内部和外界,我们表明,如果窃听者的接收信道输出是合法接收器的降级版本,则显示这些界限。此外,我们发现合法接收器的延迟通道输出反馈有助于提高Digraded FSM-WC的保密容量,只有延迟状态反馈。

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