Sum Capacity of General Deterministic Interference Channel with Channel Output Feedback

Sahai, Achaleshwar
Aggarwal, Vaneet
Yüksel Turgut, Ayşe Melda
Sabharwal, Ashutosh
In a two-user interference channel, there are four possible feedback paths - two from each receiver to the transmitters. This leads to 16 possible models of feedback. In this paper, we derive the sum capacity of two user deterministic interference channel for all sixteen cases. We find that whenever any of the direct link feedback from a receiver to its own transmitter is present, the sum-capacity is the same as when all four feedback links are present. Further when no direct link feedback is present, the sum capacity with one cross-link feedback and two cross-links of feedback is the same. This sum-capacity is the same as the sum-capacity when there is no feedback except in the regime of interference in which both interfering links are weaker than both the direct-links in which case the sum-capacity is the same as sum-capacity of the feedback model with all four feedback links.
2010 IEEE International Symposium on Information Theory


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Citation Formats
A. Sahai, V. Aggarwal, A. M. Yüksel Turgut, and A. Sabharwal, “Sum Capacity of General Deterministic Interference Channel with Channel Output Feedback,” presented at the 2010 IEEE International Symposium on Information Theory, Texas, Amerika Birleşik Devletleri, 2010, Accessed: 00, 2022. [Online]. Available: