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In this work, coding for a discrete memoryless broadcast channel with random states and two receivers is studied. Each receiver knows one of the two information sources at the sender and wants to know the other one. Since it is assumed that the sender knows the channel state sequence non-causally, an achievable rate region using Gel'fand-Pinsker-coding is derived. Further, a simple outer bound to...
A cognitive Multiple Access Channel with a Wire-tapper (cMAC-WT) is studied, where one of the two encoders is cognitive, in the sense that it knows a priori the message of the other encoder. Both the discrete and Gaussian models are considered. General achievable rates and outer bounds to the secrecy capacity region are derived, and the secrecy capacity region is identified for the special cases of...
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