Interference channels with half-duplex source cooperation

Rui Wu, Vinod M. Prabhakaran, Pramod Viswanath, Yi Wang

Research output: Contribution to journalArticle

Abstract

The performance gain by allowing half-duplex source cooperation is studied for Gaussian interference channels. The source cooperation is in-band, meaning that each source can listen to the other source's transmission, but there is no independent (or orthogonal) channel between the sources. The half-duplex constraint supposes that at each time instant the sources can either transmit or listen, but not do both. Our main result is a characterization of the sum capacity when the cooperation is bidirectional and the channel gains are symmetric. With unidirectional cooperation, we essentially have a cognitive radio channel. By requiring the primary to achieve a rate close to its link capacity, the best possible rate for the secondary is characterized within a constant. Novel inner and outer bounds are derived as part of these characterizations.

Original languageEnglish (US)
Article number6714439
Pages (from-to)1753-1781
Number of pages29
JournalIEEE Transactions on Information Theory
Volume60
Issue number3
DOIs
StatePublished - Mar 2014

Keywords

  • Capacity
  • cognitive channel
  • cooperation
  • half-duplex
  • interference channel

ASJC Scopus subject areas

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

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