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 language | English |
|---|---|
| Article number | 5403613 |
| Pages (from-to) | 139-141 |
| Number of pages | 3 |
| Journal | IEEE Communications Letters |
| Volume | 14 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 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