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We compare the rates of one-shot and iterative conferencing in a cooperative Gaussian relay channel. The relay and receiver cooperate via a conference, as introduced by Willems, in which they exchange a series of communications over orthogonal links. Under one-shot conferencing, decode-and-forward (DF) is capacity-achieving when the relay has a strong(More)
A multi-access problem is considered where two encoders wish to communicate their messages to two decoders. The encoders can further cooperate via a conference, as introduced by Willems for multi-access channels. The capacity region of this channel is shown to be the intersection of the capacity regions of two multi-access channels with partially(More)
We analyze the benefits of an automatic repeat- request (ARQ) scheme employed in doped belief-propagation decoding for increasing the throughput of fountain encoded data transmissions. The proposed doping mechanism selects doping symbols randomly from the set of input symbols contributing to degree-two output symbols. Here an output symbol is the encoded(More)
We present a framework for cross-layer scheduling of end-to-end flows in a wireless network with links sharing a common spectrum. Links employ on-off modulation with fixed transmit powers when active. The data rate obtained by an active link is determined by the signal-to-interference ratio on the link. With the knowledge of the link interference gains in(More)
The authors study information-theoretic security for discrete memoryless interference and broadcast channels with independent confidential messages sent to two receivers. Confidential messages are transmitted to their respective receivers with perfect secrecy. That is, each receiver is kept in total ignorance with respect to the message intended for the(More)
We consider optimized transmission policies for sensors with renewable energy sources. Depending on the reward for successfully transmitting a message and the energy status of a sensor itself, we will prove the existence of optimal thresholds that maximize the average reward rate. Our results are quite general since the reward values can be made(More)
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