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Coordinated base station (BS) transmission has attracted much interest for its potential to increase the capacity of wireless networks. Yet at the same time, the sum-rate with single-cell processing (SCP) is known to scale optimally with the number of users in a Rayleigh fading environment. One may therefore ask if the value of BS coordination is limited in the many user regime from a sum-rate perspective...
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 dasiacognitivepsila...
While it is well known that feedback does not increase the capacity of discrete memoryless channels, this note examines a discrete memoryless channel with a cost constraint at the output. When that cost constraint has memory, i.e., depends on several past channel outputs, it is demonstrated that the gap between the feedback and non-feedback capacities can be unbounded. One motivation for such channel...
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