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Type: Artigo de periódico
Title: Clipping Distortion Performance of Nonsquare M-QAM OFDM Systems on Nonlinear Time-Variant Channels
Author: Mendes, LL
Baldini, R
Abstract: Orthogonal frequency-division multiplexing (OFDM) systems usually make use of a set of square M quadrature-amplitude modulation (M-QAM) constellations to obtain a good tradeoff between throughput and symbol-error robustness. However, the switch to the next constellation increases the number of bits per modulation symbol by two. The introduction of nonsquare M-QAM constellations in such systems brings extra advantages such as smoother transition among bit rates and a reduction of the peak-to-average ratio of the OFDM signal. Therefore, this paper unfolds analytical expressions to evaluate the symbol-error performance of nonsquare M-QAM OFDM on nonlinear time-variant additive white Gaussian noise channels, taking clipping distortion into account. Cross and overlaid M-QAM are considered. Analytical performances are evaluated and compared with computational simulations, which show good agreement.
Subject: Clipping
nonlinear channels
nonsquare M quadrature-amplitude modulation (M-QAM)
orthogonal frequency-division multiplexing (OFDM)
time-variant channels
Country: EUA
Editor: Ieee-inst Electrical Electronics Engineers Inc
Rights: fechado
Identifier DOI: 10.1109/TVT.2011.2165307
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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