Title :
Digital baseband predistortion of wideband power amplifiers with improved memory effects
Author :
Bondar, D. ; Budimir, D.
Author_Institution :
Wireless Commun. Res. Group, Univ. of Westminster, London
Abstract :
A new digital baseband predistortion of wideband power amplifiers with improved memory effects is presented and investigated. Distortion compensation is increased by implementing proposed iterative digital baseband injection technique. Frequency-domain equalization in baseband is developed to minimize memory effects. The non-linear and memory parts of the proposed linearizer are implemented in baseband without additional feedback loop. The spectral regrowth improvement of 20 dB for a 5-MHz 16-QAM signal and a 10 dB reduction of 8 MHz offset adjacent channel power ratio (ACPR) are achieved. Experimental results are presented to validate the argument.
Keywords :
digital circuits; distortion; equalisers; frequency-domain analysis; iterative methods; linearisation techniques; power amplifiers; signal processing; wideband amplifiers; 16-QAM signal; adjacent channel power ratio; digital baseband predistortion; digital signal processing method; distortion compensation; frequency 5 MHz; frequency-domain equalization; iterative digital baseband injection technique; linearizer; memory effects; spectral regrowth; wideband power amplifier; Baseband; Broadband amplifiers; Digital signal processing; Filters; Nonlinear distortion; Power amplifiers; Power system modeling; Predistortion; Radio frequency; Wireless communication; Digital baseband predistortion; equalization; iterative injection; memory effects;
Conference_Titel :
Radio and Wireless Symposium, 2009. RWS '09. IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
978-1-4244-2698-0
Electronic_ISBN :
978-1-4244-2699-7
DOI :
10.1109/RWS.2009.4957334
