Title :
Amplifier predistortion using unscented Kalman filtering
Author :
Malipatil, Amaresh V. ; Huang, Yih-Fang
Author_Institution :
Dept. of Electr. Eng., Notre Dame Univ., IN, USA
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;
Conference_Titel :
Signal Processing Advances in Wireless Communications, 2005 IEEE 6th Workshop on
Print_ISBN :
0-7803-8867-4
DOI :
10.1109/SPAWC.2005.1505904
