Capacity of all nine models of channel output feedback for the two-user interference channel

Achaleshwar Sahai, Vaneet Aggarwal, Melda Yuksel, Ashutosh Sabharwal

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

In this paper, we study the impact of different channel output feedback architectures on the capacity of the two-user interference channel. For a two-user interference channel, a feedback link can exist between receivers and transmitters in nine canonical architectures (see Fig. 3 ), ranging from only one feedback link to four feedback links. We derive the exact capacity region for the symmetric deterministic interference channel and the constant-gap capacity region for the symmetric Gaussian interference channel for all of the nine architectures. We show that for a linear deterministic symmetric interference channel, in the weak interference regime, all models of feedback, except the one, which has only one of the receivers feeding back to its own transmitter, have the identical capacity region. When only one of the receivers feeds back to its own transmitter, the capacity region is a strict subset of the capacity region of the rest of the feedback models in the weak interference regime. However, the sum-capacity of all feedback models is identical in the weak interference regime. Moreover, in the strong interference regime, all models of feedback with at least one of the receivers feeding back to its own transmitter have the identical sum-capacity. For the Gaussian interference channel, the results of the linear deterministic model follow, where capacity is replaced with approximate capacity.

Original languageEnglish (US)
Article number6634555
Pages (from-to)6957-6979
Number of pages23
JournalIEEE Transactions on Information Theory
Volume59
Issue number11
DOIs
StatePublished - 2013

ASJC Scopus subject areas

  • Information Systems
  • Computer Science Applications
  • Library and Information Sciences

Fingerprint

Dive into the research topics of 'Capacity of all nine models of channel output feedback for the two-user interference channel'. Together they form a unique fingerprint.

Cite this