Compensation of amplifier nonlinearities on wavelet packet division multiplexing

Author

To, Kin-Fai ; Ching, P.C. ; Wong, Kon Max

Author_Institution

Dept. of Electron. Eng., Chinese Univ. of Hong Kong, Shatin, China

Volume

4

fYear

2001

fDate

2001

Firstpage

2669

Abstract

Wavelet packet division multiplexing (WPDM) is a high-capacity, flexible and robust orthogonal multiplexing scheme in which the message signals are waveform-coded onto wavelet packet basis functions for transmission. However, WPDM suffers from severe performance degradation in the presence of high-power amplifier (HPA) nonlinearities. Data predistortion using the pth-order Volterra inverse is proposed to combat the amplifier nonlinearities in a WPDM system. A 5th-order Volterra inverse with truncated memory length is designed based on the Volterra series channel model. Computer simulations are presented to demonstrate the capability of the proposed technique in compensating amplifier nonlinearities even under system parameter discrepancies. Guidelines are also proposed for designing a wavelet filter which leads to better predistortion with the truncated Volterra inverse

Keywords

Volterra series; compensation; digital filters; packet radio networks; packet switching; power amplifiers; transform coding; wavelength division multiplexing; wavelet transforms; HPA nonlinearities; Volterra series channel model; WPDM; amplifier nonlinearity compensation; data predistortion; high-capacity multiplexing; high-power amplifier; performance degradation; robust orthogonal multiplexing; truncated Volterra inverse; truncated memory length; waveform coding; wavelet filter; wavelet packet basis functions; wavelet packet division multiplexing; Computer simulation; Degradation; Finite impulse response filter; Guidelines; Nonlinear distortion; Nonlinear systems; OFDM; Predistortion; Robustness; Wavelet packets;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 2001. Proceedings. (ICASSP '01). 2001 IEEE International Conference on

Conference_Location

Salt Lake City, UT

ISSN

1520-6149

Print_ISBN

0-7803-7041-4

Type

conf

DOI

10.1109/ICASSP.2001.940551

Filename

940551