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Joint Variable Threshold M-QAM and ARQ for Nakagami-m Fading Channel with Feedback Delay
- Authors
- Lee, Sang-Do; Ko, Young-Chai
- Issue Date
- 2월-2010
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Threshold adaptation; feedback delay; M-QAM and ARQ
- Citation
- IEEE COMMUNICATIONS LETTERS, v.14, no.2, pp.139 - 141
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE COMMUNICATIONS LETTERS
- Volume
- 14
- Number
- 2
- Start Page
- 139
- End Page
- 141
- ISSN
- 1089-7798
- 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 M-QAM 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.
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