On Channel Output Feedback in Deterministic Interference Channels [article]

Achaleshwar Sahai and Vaneet Aggarwal and Melda Yuksel and Ashutosh Sabharwal
2009 arXiv   pre-print
In this paper, we study the effect of channel output feedback on the sum capacity in a two-user symmetric deterministic interference channel. We find that having a single feedback link from one of the receivers to its own transmitter results in the same sum capacity as having a total of 4 feedback links from both the receivers to both the transmitters. Hence, from the sum capacity point of view, the three additional feedback links are not helpful. We also consider a half-duplex feedback model
more » ... ere the forward and the feedback resources are symmetric and timeshared. Surprisingly, we find that there is no gain in sum-capacity with feedback in a half-duplex feedback model when interference links have more capacity than direct links.
arXiv:0905.2392v2 fatcat:yfabj5duh5fmnmb7ajx6dr3lne