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
Official URL: http://dx.doi.org/10.1109/CRMICO.2008.4676376
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|
|Deposited On:||19 Dec 2008 15:27|
|Last Modified:||11 Aug 2010 15:34|
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