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Abstract: In this paper, the delay limited secrecy capacity of the flat fading channelis investigated under two different assumptions on the available transmitterchannel state information CSI. The first scenario assumes perfect priorknowledge of both the main and eavesdropper channel gains. Here, upper andlower bounds on the secure delay limited capacity are derived and shown to betight in the high signal-to-noise ratio SNR regime for a wide class ofchannel distributions. In the second scenario, only the main channel CSI isassumed to be available at the transmitter. Remarkably, under this assumption,we establish the achievability of non-zero secure rate for a wide class ofchannel distributions under a strict delay constraint. In the two cases, ourachievability arguments are based on a novel two-stage approach that overcomesthe secrecy outage phenomenon observed in earlier works.



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

Source: https://arxiv.org/







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