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Linearization of power amplifiers by baseband digital predistortion for OFDM transmitters

Bondar, Dmytro and Budimir, Djuradj and Shelkovnikov, Boris (2008) Linearization of power amplifiers by baseband digital predistortion for OFDM transmitters. In: 18th International Crimean Conference "Microwave & Telecommunication Technology" (CriMiCo'2008). 8-12 September, Sevastopol, Crimea, Ukraine. IEEE, Los Alamitos, USA, pp. 270-271. ISBN 9789663351698

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Official URL: http://dx.doi.org/10.1109/CRMICO.2008.4676376

Abstract

For the signals with high peak-to-average ratio (PAR), such as WiMax OFDM, power amplifiers need to operate in a compression mode. It results in a non-linear distortion of the output signal. To compensate for this distortion, linearizers are used. However, they decrease efficiency of amplifiers. This paper proposes to use a digital predistortion of baseband signals, which is characterized by a small impact on efficiency and a good linearizing performance, for linearization of OFDM transmitters. The paper describes design of a baseband predistorter and verifies its performances by WiMax OFDM simulations in ADS. Proposed predistorter brings significant improvements in AM/AM characteristic, eliminates spectrum re-growth, decreases adjacent channel power ratio (ACPR) and error vector magnitude (EVM).

Item Type:Book Section
Research Community:University of Westminster > Electronics and Computer Science, School of
ID Code:5637
Deposited On:19 Dec 2008 15:27
Last Modified:11 Aug 2010 15:34

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