Power allocation strategies for distributed space-time codes in amplify-and-forward mode

Behrouz Maham, Are HjØrungnes

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

We consider a wireless relay network with Rayleigh fading channels and apply distributed space-time coding (DSTC) in amplify-and-forward (AF) mode. It is assumed that the relays have statistical channel state information (CSI) of the local source-relay channels, while the destination has full instantaneous CSI of the channels. It turns out that, combined with the minimum SNR based power allocation in the relays, AF DSTC results in a new opportunistic relaying scheme, in which the best relay is selected to retransmit the sources signal. Furthermore, we have derived the optimum power allocation between two cooperative transmission phases by maximizing the average received SNR at the destination. Next, assuming M-PSK and M-QAM modulations, we analyze the performance of cooperative diversity wireless networks using AF opportunistic relaying. We also derive an approximate formula for the symbol error rate (SER) of AF DSTC. Assuming the use of full-diversity space-time codes, we derive two power allocation strategies minimizing the approximate SER expressions, for constrained transmit power. Our analytical results have been confirmed by simulation results, using full-rate, full-diversity distributed space-time codes.

Original languageEnglish
Article number612719
JournalEurasip Journal on Advances in Signal Processing
Volume2009
DOIs
Publication statusPublished - 2009
Externally publishedYes

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Space time codes
Channel state information
Phase shift keying
Quadrature amplitude modulation
Rayleigh fading
Fading channels
Wireless networks
Modulation

ASJC Scopus subject areas

  • Hardware and Architecture
  • Signal Processing
  • Electrical and Electronic Engineering

Cite this

Power allocation strategies for distributed space-time codes in amplify-and-forward mode. / Maham, Behrouz; HjØrungnes, Are.

In: Eurasip Journal on Advances in Signal Processing, Vol. 2009, 612719, 2009.

Research output: Contribution to journalArticle

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