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arXiv 0907.3341cs.ITmath.IT
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具有严格时延约束的保密通信

Opportunistic Secrecy with a Strict Delay Constraint

Karim Khalil, O. Ozan Koyluoglu, Hesham El Gamal, Moustafa Youssef

摘要:

本文研究了在两种不同的假设条件下,平坦衰落信道的延迟受限保密容量。第一种情况假设完美的先验知识的主要和窃听信道增益。在这里,上界和下界的延迟有限的保密能力的推导,并示出在高信噪比(SNR)制度是紧。在第二种情况下,只有主信道CSI被假定为在发射机处可用,其中,值得注意的是,我们建立了非零延迟限制的安全速率的可靠性,对于宽类的信道分布,具有高概率。在这两种情况下,我们的可验证性参数是基于一种新的两阶段密钥共享方法,克服了早期作品中观察到的保密中断现象。

英文摘要:

We investigate the delay limited secrecy capacity of the flat fading channel under two different assumptions on the available transmitter channel state information (CSI). The first scenario assumes perfect prior knowledge of both the main and eavesdropper channel gains. Here, upper and lower bounds on the delay limited secrecy capacity are derived, and shown to be tight in the high signal-to-noise ratio (SNR) regime. In the second scenario, only the main channel CSI is assumed to be available at the transmitter where, remarkably, we establish the achievability of a non-zero delay-limited secure rate, for a wide class of channel distributions, with a high probability. In the two cases, our achievability arguments are based on a novel two-stage key-sharing approach that overcomes the secrecy outage phenomenon observed in earlier works.

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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