Amplifier predistortion using unscented Kalman filtering

Author

Malipatil, Amaresh V. ; Huang, Yih-Fang

Author_Institution

Dept. of Electr. Eng., Notre Dame Univ., IN, USA

fYear

2005

fDate

5-8 June 2005

Firstpage

221

Lastpage

225

Abstract

Bandwidth efficient modulation schemes like M-ary quadrature amplitude modulation (M-QAM) and orthogonal frequency division multiplexing (OFDM) suffer from amplifier nonlinearities when operated near saturation. The high power amplifier (HPA) characteristics could be memoryless or with memory, as experienced in wideband CDMA (W-CDMA). Digital baseband predistortion is an efficient technique to compensate for the amplifier nonlinearities. In this paper, an unscented Kalman filter (UKF) is used to design an adaptive predistorter (PD) for the general case of a nonlinear amplifier with memory. Simulation results are shown to verify the performance of the proposed method.

Keywords

OFDM modulation; adaptive Kalman filters; broadband networks; code division multiple access; nonlinear distortion; power amplifiers; quadrature amplitude modulation; HPA; M-QAM; M-ary quadrature amplitude modulation; OFDM; UKF; W-CDMA; adaptive predistorter design; digital baseband predistortion; high power amplifier; nonlinear amplifier; orthogonal frequency division multiplexing; unscented Kalman filter; wideband CDMA; Amplitude modulation; Bandwidth; Broadband amplifiers; Filtering; High power amplifiers; Kalman filters; Multiaccess communication; OFDM modulation; Predistortion; Quadrature amplitude modulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing Advances in Wireless Communications, 2005 IEEE 6th Workshop on

Print_ISBN

0-7803-8867-4

Type

conf

DOI

10.1109/SPAWC.2005.1505904

Filename

1505904