Title :
Memory effect evaluation and predistortion of power amplifiers
Author :
Draxler, P. ; Deng, J. ; Kimball, D. ; Langmore, I. ; Asbeck, P.M.
Author_Institution :
UCSD & QUALCOMM Inc., San Diego, CA, USA
Abstract :
This paper introduces the envelope model reference adaptive control construct to digital predistortion of RF power amplifiers. It is used to formulate a block level predistortion algorithm that compensates for the both memoryless compression characteristics and deterministic memory effects. An iterative technique of successive approximations is used to obtain the memory effect inverse function. The algorithm is applied to two amplifiers and convergence is demonstrated. Qualitative results (instantaneous input/output plots) and quantitative results (the sequence and ensemble RMS error over the iteration sequence) are presented.
Keywords :
distortion; iterative methods; microwave power amplifiers; model reference adaptive control systems; RF power amplifiers; block level predistortion algorithm; digital predistortion; envelope model reference adaptive control; inverse function; iterative technique; memory effect evaluation; memoryless compression; power amplifier predistortion; Adaptive control; Batteries; Convergence; Error correction; Iterative algorithms; Power amplifiers; Power system modeling; Predistortion; Radio frequency; Radiofrequency amplifiers;
Conference_Titel :
Microwave Symposium Digest, 2005 IEEE MTT-S International
Print_ISBN :
0-7803-8845-3
DOI :
10.1109/MWSYM.2005.1516993