A new digital predistortion for linearity improvement and suppression of memory effects

Author

Bondar, D. ; Budimir, D.

Author_Institution

Wireless Commun. Res. Group, Univ. of Westminster, London, UK

fYear

2009

fDate

Sept. 29 2009-Oct. 1 2009

Firstpage

1437

Lastpage

1440

Abstract

This paper presents a new baseband digital predistortion technique, which includes iterative injection of odd-order in-band distortion components, and baseband equalization of the input signal. The former enhances compensation of nonlinearity and gains the optimal ratio of linearization degree to computational complexity by adjusting the number of injections. The latter minimizes memory effects of the power amplifier (PA) using digital signal processing. The proposed linearizer is integrated into the baseband block, and does not require additional radio-frequency components. For demonstration, a wideband 25-dB gain power amplifier is linearized using the proposed predistortion. For a 5-MHz 16-QAM signal the spectral regrowth suppression of 23 dB is achieved.

Keywords

iterative methods; quadrature amplitude modulation; signal processing; 16-QAM signal; baseband digital predistortion; baseband equalization; computational complexity; digital signal processing; frequency 5 MHz; gain power amplifier; input signal; iterative injection; linearity improvement; linearization degree; memory effects suppression; odd-order in-band distortion components; radio-frequency components; spectral regrowth suppression; Baseband; Broadband amplifiers; Computational complexity; Digital signal processing; Distortion; Linearity; Power amplifiers; Predistortion; Radio frequency; Radiofrequency amplifiers;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2009. EuMC 2009. European

Conference_Location

Rome

Print_ISBN

978-1-4244-4748-0

Type

conf

Filename

5296346