On Channel Output Feedback in Deterministic Interference Channels

Details On Channel Output Feedback in Deterministic Interference Channels On Channel Output Feedback in Deterministic Interference Channels

2009-05-14

arxiv.org/abs/0905.2392v2

Computer Science

Information Theory

To appear in IEEE ITW, Oct. 2009

Scientific paper

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.

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