Adaptive modulation in decode-and-forward cooperative communications with limited source-relay CSI

Min Kuan Chang*, Feng-Tsun Chien

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

In this letter, we study the problem of adaptive modulation (AM) in cooperative decode-and-forward (DF) relaying systems with limited channel state information (CSI) of the source-relay link. We first develop the signal-to-noise ratio (SNR)-based opportunistic AM and obtain the regions of the source-destination and relay-destination link SNR, by which whether cooperative relaying is needed and what constellation size should be chosen can be determined without requiring the source-relay link CSI. We also propose the probabilistic AM to further enhance the transmission rate. Simulation results demonstrate the effectiveness of the proposed AM criteria.

Original languageEnglish
Article number6940230
Pages (from-to)2157-2160
Number of pages4
JournalIEEE Communications Letters
Volume18
Issue number12
DOIs
StatePublished - 1 Dec 2014

Keywords

  • Adaptive modulation
  • Decode-and-forward protocol
  • Multi-node cooperative communications

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