Capacity bounds for Cooperative diversity
IEEE Transactions on Information Theory
Achievable rates in cognitive radio channels
IEEE Transactions on Information Theory
Capacity of a Class of Cognitive Radio Channels: Interference Channels With Degraded Message Sets
IEEE Transactions on Information Theory
On the Achievable Rate Regions for Interference Channels With Degraded Message Sets
IEEE Transactions on Information Theory
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This paper considers the so-called cognitive Z channel, where two users transmit two independent messages to their respective receivers through a Z interference channel. User 1 (primary user) interferes with receiver 2 while user 2 (secondary user) does not interfere with receiver 1. In addition, user 2 overhears the transmission of user 1 through a noisy channel, hence the term 'cognitive'. We proposed two nontrivial capacity outer bounds, which established a capacity region corner point for certain parameter regimes. These outer bounds, together with previously proposed achievable rate region, shed light on the usefulness of the causal cooperation under certain channel conditions. Numerical examples are also given.