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 journalArticlepeer-review

    8 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

    Bibliographical note

    Funding Information:
    Manuscript received November 8, 2009. The associate editor coordinating the review of this letter and approving it for publication was F. Jondral. S.-D. Lee is with Samsung Electronics, Suwon, Korea (e-mail: [email protected]). Y.-C. Ko is with the School of Electrical Engineering, Korea University, Seoul 136-701, Korea (e-mail: [email protected]). This research was supported by the MKE(The Ministry of Knowledge Economy), Korea, under the ITRC (Information Technology Research Center) support program supervised by the NIPA (National IT Industry Promotion Agency) (NIPA-2009-C1090-0902-0037). Digital Object Identifier 10.1109/LCOMM.2010.02.092191

    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