On Capacity of Gaussian 'Cheap' Relay Channel

Mohammad Ali Khojastepour, Ashutosh Sabharwal, Behnaam Aazhang

Research output: Contribution to conferencePaperpeer-review

91 Scopus citations


In this paper, we derive the capacity of the Gaussian degraded 'cheap' relay channel, consisting of nodes using 'cheap' radios operating in TDD mode when transmitting and sending in the same frequency band. The TDD model captures a practical limitation of most of the RF radios used in commercial wireless systems. The proof of achievability relies on a combination of superposition encoding and list decoding, while the converse is derived using the min-cut max-flow theorem for networks with 'cheap' nodes (previously derived by the authors). Even with 'cheap' radios, our capacity analysis shows that cooperative coding is beneficial and has a capacity advantage over direct transmission.

Original languageEnglish (US)
Number of pages5
StatePublished - 2003
EventIEEE Global Telecommunications Conference GLOBECOM'03 - San Francisco, CA, United States
Duration: Dec 1 2003Dec 5 2003


ConferenceIEEE Global Telecommunications Conference GLOBECOM'03
Country/TerritoryUnited States
CitySan Francisco, CA

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Global and Planetary Change


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