Title :
A novel predistorter for power amplifier
Author :
Minglu, Jin ; Shin, Sooyoung Kim ; Oh, Deockgil
Author_Institution :
Dept. of Broadband Wireless Commun., ETRI, South Korea
Abstract :
In this paper, we propose a novel predistortion scheme with the aid of a piecewise polynomial modeling of the AM/AM and AM/PM characteristics for an high power amplifier (HPA). Multiple polynomials are used to predistort the input signal instead of a single one, by dividing the input signal range into several regions. For a HPA model we considered, we optimized the number of regions, subdivision points and order of polynomial functions in each region to increase the predistortion performance without an increase of computational load. From the simulation results investigated in this paper, the proposed method showed about a 0.5 dB gain in total degradation compared to a conventional polynomial predistortion method.
Keywords :
adaptive signal processing; least mean squares methods; nonlinear distortion; polynomials; power amplifiers; radiofrequency amplifiers; AM/AM characteristics; AM/PM characteristics; HPA model; LMS algorithm; adaptive predistorter; high power amplifier; multiple polynomials; piecewise polynomial modeling; polynomial functions; predistortion scheme; Broadband amplifiers; Broadband communication; Computational modeling; Degradation; High power amplifiers; Polynomials; Power amplifiers; Predistortion; Table lookup; Wireless communication;
Conference_Titel :
Microwave and Millimeter Wave Technology, 2002. Proceedings. ICMMT 2002. 2002 3rd International Conference on
Print_ISBN :
0-7803-7486-X
DOI :
10.1109/ICMMT.2002.1187906
