Adaptive M-QAM modulation over Nakagami fading channels

M. S. Alouini*, A. Goldsmith

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

70 Scopus citations

Abstract

We study the performance of constant-power variable-rate M-QAM schemes over Nakagami fading channels. We obtain closed-form expressions for the outage probability, spectral efficiency and average bit-error-rate (BER) assuming perfect channel estimation and negligible time delay. For a target BER of 10-3, the spectral efficiency of adaptive continuous rate M-QAM comes within 5 dB of the Shannon capacity limit, and adaptive discrete rate M-QAM comes within 6.2 dB of this limit. Nonadaptive BPSK suffers a large spectral efficiency penalty relative to these adaptive techniques. We also analyze the impact of time delay on the BER of adaptive M-QAM. Results show that systems with low BER requirements will be more sensitive to time delay, but will still operate satisfactorily if the delay is below a critical value.

Original languageEnglish (US)
Title of host publicationConference Record / IEEE Global Telecommunications Conference
Editors Anon
PublisherIEEE
Pages218-233
Number of pages16
Volume4
StatePublished - 1997
Externally publishedYes
EventProceedings of the 1997 IEEE Global Telecommunications Mini-Conference - Phoenix, AZ, USA
Duration: Nov 3 1997Nov 8 1997

Other

OtherProceedings of the 1997 IEEE Global Telecommunications Mini-Conference
CityPhoenix, AZ, USA
Period11/3/9711/8/97

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Global and Planetary Change

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