Open Access

Turbo Decision Aided Receivers for Clipping Noise Mitigation in Coded OFDM

EURASIP Journal on Wireless Communications and Networking20072008:352597

https://doi.org/10.1155/2008/352597

Received: 11 July 2006

Accepted: 31 August 2007

Published: 21 October 2007

Abstract

Orthogonal frequency division multiplexing (OFDM) is the modulation technique used in most of the high-rate communication standards. However, OFDM signals exhibit high peak average to power ratio (PAPR) that makes them particularly sensitive to nonlinear distortions caused by high-power amplifiers. Hence, the amplifier needs to operate at large output backoff, thereby decreasing the average efficiency of the transmitter. One way to reduce PAPR consists in clipping the amplitude of the OFDM signal introducing an additional noise that degrades the overall system performance. In that case, the receiver needs to set up an algorithm that compensates this clipping noise. In this paper, we propose three new iterative receivers with growing complexity and performance that operate at severe clipping: the first and simplest receiver uses a Viterbi algorithm as channel decoder whereas the other two implement a soft-input soft-output (SISO) decoder. Each soft receiver is analyzed through EXIT charts for different mappings. Finally, the performances of the receivers are simulated on both short time-varying channel and AWGN channel.

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Authors’ Affiliations

(1)
Décom-Crestic Lab, University of Reims Champagne-Ardenne
(2)
ETIS Lab, Ecole Nationale Supérieure de l'Electronique et de ses Applications

Copyright

© Maxime Colas et al. 2008

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.