Interference channel with a relay: Models, relaying strategies, bounds

Onur Sahin, Elza Erkip, Osvaldo Simeone

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This paper discusses the impact of relaying in interference-limited networks by studying a two-user Gaussian interference channel with a relay (IeR). Various models for relay reception and transmission are possible: The relay can receive and transmit in the same band as the sources (i.e., in-band reflly reception! transmission), or else relay reception, or both reception and transmission, can take place over orthogonal links of limited capacity (i.e., out-of-band reflly reception or/ and transmission). In all scenarios, the selection of either signal refllying, interference forwarding or a combination thereof for the relay operation is identified as a common design choice. While signal relaying enables the destination to obtain a stronger desired signal or additional information, interference forwarding helps removing part of the interference. Important scenarios under which signal relaying and interference forwarding are optimal are identified, including cognitive relaying where the relay is unaware of the source codebooks and out-of band relaying, both under certain modified strong interference conditions and the latter under additional capacity constraints on the orthogonal relay links.

Original languageEnglish (US)
Title of host publicationInformation Theory and Applications Workshop, ITA 2009
Number of pages6
StatePublished - 2009
EventInformation Theory and Applications Workshop, ITA 2009 - San Diego, CA, United States
Duration: Feb 8 2009Feb 13 2009

Publication series

NameInformation Theory and Applications Workshop, ITA 2009


OtherInformation Theory and Applications Workshop, ITA 2009
Country/TerritoryUnited States
CitySan Diego, CA

ASJC Scopus subject areas

  • Computer Science Applications
  • Information Systems


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