Title :
An efficient adaptive predistorter for nonlinear high power amplifier in satellite communication
Author :
Kang, Hyun Woo ; Cho, Yong Soo ; Youn, Dae Hee
Author_Institution :
Inf. & Telecommun. R&D Center, Hyundai Electron. Ind. Co. Ltd., South Korea
Abstract :
This paper presents an efficient adaptive predistortion technique for compensation of linear and nonlinear distortion caused by high-power amplifier with memory in satellite communication channels. The previous adaptive predistortion techniques, based on Volterra series modeling, are not suitable for real-time implementation due to high computational burden and slow convergence rate. In this paper, the memoryless HPA preceded by linear dynamic system is modeled by the Wiener system which is then precompensated by the proposed adaptive predistorter structured by the Hammerstein model. An adaptive algorithm for adjusting the parameters of the predistorter is derived using the stochastic gradient method. The validity of the proposed approach is confirmed via computer simulation by applying it to 16-QAM satellite communication channel where the HPA is preceded by a linear filter
Keywords :
adaptive filters; adaptive signal processing; compensation; digital filters; digital radio; electric distortion; filtering theory; microwave power amplifiers; quadrature amplitude modulation; satellite communication; stochastic processes; travelling wave amplifiers; travelling wave tubes; 16-QAM communication channel; Hammerstein model; TWT amplifier; Wiener system; adaptive algorithm; adaptive predistorter; compensation; convergence rate; linear distortion; linear dynamic system; memoryless HPA; nonlinear distortion; nonlinear high power amplifier; precompensation; real-time implementation; satellite communication; stochastic gradient method; Adaptive algorithm; Convergence; Gradient methods; High power amplifiers; Nonlinear distortion; Nonlinear dynamical systems; Power system modeling; Predistortion; Satellite communication; Stochastic processes;
Conference_Titel :
Circuits and Systems, 1997. ISCAS '97., Proceedings of 1997 IEEE International Symposium on
Print_ISBN :
0-7803-3583-X
DOI :
10.1109/ISCAS.1997.612779