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Following the work of Liu and Goldsmith in 2009, we study a class of Z-interference channels that satisfy the shift-invariant condition but not the maximum entropy condition. We provide a new capacity region outer bound for this class of Z-interference channels. We show the tightness of the proposed outer bound by finding the capacity region of certain Z-interference channels which were not previously...
We study a two-transmitter two-receiver network where Receiver 1 can only hear the transmitted signal of Transmitter 1. Transmitter 1 has two messages, one of which is intended for Receiver 1 while both are intended for Receiver 2. Transmitter 2 has one message which is intended for Receiver 2. We call this channel model the Z channel with degraded message sets. When the multiple access link between...
This paper studies the problem of secure communication over a wiretap channel where the transmitter and the legitimate receiver share a secret key, which is concealed from the eavesdropper. We find the secrecy capacity under this scenario. This result generalizes that of Yamamoto, which is applicable only to less noisy wiretap channels, to the general wiretap channel when no distortion is allowed...
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