Title :
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
fDate :
Sept. 29 2009-Oct. 1 2009
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;
Conference_Titel :
Microwave Conference, 2009. EuMC 2009. European
Conference_Location :
Rome
Print_ISBN :
978-1-4244-4748-0
