An optimal power allocation scheme for the STC Hybrid-ARQ over energy limited networks

Hongbo Liu, Leonid Razoumov, Narayan Mandayam, Predrag Spasojević

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

In this paper, we show that for STC (Space-Time Coded) Hybrid-ARQ (Automatic Repeat reQuest) schemes with (re)transmission power control over independent Rayleigh block fading channels, the problem of optimizing energy efficiency with a PER (Packet Error Rate) constraint can be solved as a geometric programming problem. The optimum transmit power increases super-linearly with each requested retransmission and the fraction of the average power optimally allocated to each ARQ round only depends on the incremental diversity gain. The energy savings increases with a decrease in the PER targets and decreases with an increase in the diversity gain.

Original languageEnglish (US)
Article number5351683
Pages (from-to)5718-5722
Number of pages5
JournalIEEE Transactions on Wireless Communications
Volume8
Issue number12
DOIs
StatePublished - Dec 2009

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

Keywords

  • Energy limited networks
  • Geometric programming
  • Hybrid ARQ
  • Space-time codes

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