Capacity outer bounds for the cognitive Z channel

Yi Cao, Biao Chen

Research output: Chapter in Book/Entry/PoemConference contribution

2 Scopus citations


This paper considers the so-called cognitive Z channel, where two users transmit two independent messages to their respective receivers through a Z interference channel. User 1 (primary user) interferes with receiver 2 while user 2 (secondary user) does not interfere with receiver 1. In addition, user 2 overhears the transmission of user 1 through a noisy channel, hence the term 'cognitive'. We proposed two nontrivial capacity outer bounds, which established a capacity region corner point for certain parameter regimes. These outer bounds, together with previously proposed achievable rate region, shed light on the usefulness of the causal cooperation under certain channel conditions. Numerical examples are also given.

Original languageEnglish (US)
Title of host publicationGLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference
StatePublished - 2009
Event2009 IEEE Global Telecommunications Conference, GLOBECOM 2009 - Honolulu, HI, United States
Duration: Nov 30 2009Dec 4 2009

Publication series

NameGLOBECOM - IEEE Global Telecommunications Conference


Other2009 IEEE Global Telecommunications Conference, GLOBECOM 2009
Country/TerritoryUnited States
CityHonolulu, HI

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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