Outage-optimal relay strategy under outdated channel state information in decode-and-forward cooperative communication systems

Li Fei, Jun Zhang, Qiang Gao*, Xiao-Hong Peng

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

In this study, the authors investigate the outage-optimal relay strategy under outdated channel state information (CSI) in a decode-and-forward cooperative communication system. They first confirm mathematically that minimising the outage probability under outdated CSI is equivalent to minimising the conditional outage probability on the outdated CSI of all the decodable relays' links. They then propose a multiple-relay strategy with optimised transmitting power allocation (MRS-OTPA) that minimises the conditional outage probability. It is shown that this MRS is a generalised relay approach to achieve the outage optimality under outdated CSI. To reduce the complexity, they also propose a MRS with equal transmitting power allocation (MRS-ETPA) that achieves near-optimal outage performance. It is proved that full spatial diversity, which has been achieved under ideal CSI, can still be achieved under outdated CSI through MRS-OTPA and MRS-ETPA. Finally, the outage performance and diversity order of MRS-OTPA and MRS-ETPA are evaluated by simulation.

Original languageEnglish
Pages (from-to)441-450
Number of pages10
JournalIET Communications
Volume9
Issue number4
Early online date12 Dec 2014
DOIs
Publication statusPublished - 5 Mar 2015

Keywords

  • optimisation
  • probability
  • decode and forward communication
  • resource allocation
  • diversity reception
  • cooperative communication

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