Decode-and-forward cooperative diversity with power allocation in wireless networks

J. Luo, R. S. Blum, L. J. Cimini, L. J. Greenstein, Alexander Haimovich

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

21 Scopus citations

Abstract

We study power allocation for the space-time-coded decode-and-forward cooperative diversity protocol in a wireless network under the assumption that only mean channel gains are available at the transmitters. In a Rayleigh fading channel with uniformly random node locations, a near-optimal power allocation that minimizes the outage probability is derived under a short-term power constraint, wherein the total power is fixed for each two-stage transmission. This near-optimal scheme allocates one half of the total power to the source node and splits the remaining half equally among selected relay nodes; a node is selected for relay if it is able to decode the signal from the source and its mean channel gain to the destination is above a threshold. Numerical results show that this scheme significantly outperforms the Constant-Power scheme, wherein all nodes use the same power at all times, and the Best-Select scheme, which employs one relay node with the largest mean relay-destination gain.

Original languageEnglish (US)
Title of host publicationGLOBECOM'05
Subtitle of host publicationIEEE Global Telecommunications Conference, 2005
Pages3048-3052
Number of pages5
Volume5
DOIs
StatePublished - Dec 1 2005
EventGLOBECOM'05: IEEE Global Telecommunications Conference, 2005 - St. Louis, MO, United States
Duration: Nov 28 2005Dec 2 2005

Other

OtherGLOBECOM'05: IEEE Global Telecommunications Conference, 2005
Country/TerritoryUnited States
CitySt. Louis, MO
Period11/28/0512/2/05

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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