On energy efficiency and optimum resource allocation of relay transmissions in the low-power regime

Yingwei Yao, Xiaodong Cai, Georgios B. Giannakis

Research output: Contribution to journalArticlepeer-review

135 Scopus citations

Abstract

Relay links are expected to play a critical role in the design of wireless networks. This paper investigates the energy efficiency of relay communications in the low-power regime under two different scenarios: when the relay has unlimited power supply and when it has limited power supply. A system with a source node, a destination node, and a single relay operating in the time division duplex (TDD) mode was considered. Analysis and simulations are used to compare the energy required for transmitting one information bit in three different relay schemes: amplify and forward (AnF), decode and forward (DnF), and block Markov coding (BMC). Relative merits of these relay schemes in comparison with direct transmissions (direct Tx) are discussed. The optimal allocation of power and transmission time between source and relay is also studied.

Original languageEnglish (US)
Pages (from-to)2917-2927
Number of pages11
JournalIEEE Transactions on Wireless Communications
Volume4
Issue number6
DOIs
StatePublished - Nov 1 2005

Keywords

  • Amplify and forward
  • Block markov coding
  • Decode and forward
  • Energy efficiency
  • Relay transmission

ASJC Scopus subject areas

  • Engineering(all)
  • Computer Networks and Communications

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