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This article is part of the series Multicarrier Systems.

Open Access Research Article

Power Backoff Reduction Techniques for Generalized Multicarrier Waveforms

F Danilo-Lemoine1, D Falconer1*, C-T Lam1, M Sabbaghian1 and K Wesołowski2

Author Affiliations

1 Department of Systems and Computer Engineering, Carleton University, Ottawa, Canada, K1S 5B6

2 Institute of Electronics and Telecommunications, Poznań University of Technology, Poznań 60965, Poland

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EURASIP Journal on Wireless Communications and Networking 2008, 2008:437801  doi:10.1155/2008/437801

The electronic version of this article is the complete one and can be found online at: http://jwcn.eurasipjournals.com/content/2008/1/437801


Received:3 April 2007
Revisions received:31 July 2007
Accepted:18 October 2007
Published:21 November 2007

© 2008 The Author(s).

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.

Abstract

Amplification of generalized multicarrier (GMC) signals by high-power amplifiers (HPAs) before transmission can result in undesirable out-of-band spectral components, necessitating power backoff, and low HPA efficiency. We evaluate variations of several peak-to-average power ratio (PAPR) reduction and HPA linearization techniques which were previously proposed for OFDM signals. Our main emphasis is on their applicability to the more general class of GMC signals, including serial modulation and DFT-precoded OFDM. Required power backoff is shown to depend on the type of signal transmitted, the specific HPA nonlinearity characteristic, and the spectrum mask which is imposed to limit adjacent channel interference. PAPR reduction and HPA linearization techniques are shown to be very effective when combined.

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