Variable threshold M-QAM with feedback delay over Nakagami-m fading channels

Sang Do Lee, Young-Chai Ko

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper, we propose an adaptive M-ary quadrature amplitude modulation (M-QAM) with variable threshold, which adapts the threshold of rate-region boundaries to the variation of feedback delay between the transmitter and the receiver, over independent and identically-distributed (i.i.d) Nakagami-m fading (NMF) channel. The proposed scheme exploits the estimation of instantaneous bit error rate (BER) which is based on the maximum a posteriori (MAP) criterion in [1]. Based on the proposed scheme, we derive the threshold adaptation algorithm to minimize the effect of the feedback delay on the spectral efficiency and the average BER. Numerical results show that our proposed scheme is more reliable to the feedback delay than conventional adaptive M-QAM with fixed thresholds.

Original languageEnglish
Title of host publicationIEEE Vehicular Technology Conference
DOIs
Publication statusPublished - 2009 Dec 1
Event2009 IEEE 70th Vehicular Technology Conference Fall, VTC 2009 Fall - Anchorage, AK, United States
Duration: 2009 Sep 202009 Sep 23

Other

Other2009 IEEE 70th Vehicular Technology Conference Fall, VTC 2009 Fall
CountryUnited States
CityAnchorage, AK
Period09/9/2009/9/23

Fingerprint

Feedback Delay
Nakagami-m Fading
Quadrature Amplitude Modulation
Quadrature amplitude modulation
Fading Channels
Fading channels
Feedback
Bit error rate
Error Rate
Maximum a Posteriori
Spectral Efficiency
Transmitters
Identically distributed
Transmitter
Instantaneous
Receiver
Minimise
Numerical Results

Keywords

  • Adaptive modulation
  • BER estimation
  • MQAM
  • Threshold adaptation

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Science Applications
  • Applied Mathematics

Cite this

Variable threshold M-QAM with feedback delay over Nakagami-m fading channels. / Lee, Sang Do; Ko, Young-Chai.

IEEE Vehicular Technology Conference. 2009. 5378871.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Lee, SD & Ko, Y-C 2009, Variable threshold M-QAM with feedback delay over Nakagami-m fading channels. in IEEE Vehicular Technology Conference., 5378871, 2009 IEEE 70th Vehicular Technology Conference Fall, VTC 2009 Fall, Anchorage, AK, United States, 09/9/20. https://doi.org/10.1109/VETECF.2009.5378871
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