Joint variable threshold M-QAM and ARQ for Nakagami-m fading channel with feedback delay

Sang Do Lee, Young Chai Ko

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

In this paper, we develop a cross-layer combining of adaptive M-ary quadrature amplitude modulation (M-QAM) and automatic repeat request (ARQ) protocol, which adapts the threshold of rate-region boundaries to the variation of feedback delay over the Nakagami-m fading (NMF) channels. We derive a threshold adaptation scheme to reduce the effect of the feedback delay on bit error rate (BER). Numerical results reveal that MQAM with threshold adaptation is more reliable to the feedback delay than M-QAM with fixed thresholds. When we combine the proposed scheme with ARQ, the enhanced BER can lower the probability of packet loss and reduce the number of packet retransmissions.

Original languageEnglish
Article number5403613
Pages (from-to)139-141
Number of pages3
JournalIEEE Communications Letters
Volume14
Issue number2
DOIs
Publication statusPublished - 2010 Feb

Keywords

  • Feedback delay
  • M-QAM and ARQ
  • Threshold adaptation

ASJC Scopus subject areas

  • Modelling and Simulation
  • Computer Science Applications
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'Joint variable threshold M-QAM and ARQ for Nakagami-m fading channel with feedback delay'. Together they form a unique fingerprint.

Cite this