On Channel Output Feedback in Deterministic Interference Channels
Abstract
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 where 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.
Keywords
Cite
@article{arxiv.0905.2392,
title = {On Channel Output Feedback in Deterministic Interference Channels},
author = {Achaleshwar Sahai and Vaneet Aggarwal and Melda Yuksel and Ashutosh Sabharwal},
journal= {arXiv preprint arXiv:0905.2392},
year = {2009}
}
Comments
To appear in IEEE ITW, Oct. 2009