Recovering multiplexing loss through concurrent Decode-and-Forward (DF) relaying

Chao Wang*, Yijia Fan, John S. Thompson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, we develop a novel digital cooperative diversity transmission protocol for a two-source scenario by combining the two sources' two classic decode-and-forward (DF) relaying steps and using 2L + 1 time slots to transmit L codewords from each source. Assuming the relays can perfectly decode their associated source messages, we give an information-theoretic average achievable capacity region for this transmission scheme. Through diversity-multiplexing tradeoff analysis, we show that our so called concurrent DF relaying protocol can effectively recover the multiplexing loss induced by the half-duplex operation in the relays, while still obtaining some diversity gain. Numerical results reveal our scheme offers significant performance advantages over the classic DF relaying protocols, especially for high signal-to-noise ratio (SNR) and large frame length L regime.

Original languageEnglish
Pages (from-to)193-213
Number of pages21
JournalWireless Personal Communications
Volume48
Issue number1
DOIs
Publication statusPublished - 1 Jan 2009

Keywords

  • Capacity region
  • Concurrent decode-and-forward (DF) relaying
  • Cooperative diversity
  • Diversity-multiplexing tradeoff

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