Reduction of adjacent channel interference using postdistortion

Author

Stapleton, S.P. ; Quach, Le

Author_Institution

Sch. of Eng. Sci., Simon Fraser Univ., Burnaby, BC, Canada

fYear

1992

fDate

10-13 May 1992

Firstpage

915

Abstract

An adaptive postdistortion approach that allows for an increase in spectral-efficiency and the portable transmitter power efficiency is presented. The basic idea of the postdistortion technique is to compensate for the adjacent channel´s power amplifier AM-AM and AM-FM nonlinearities, at the base station receiver. Coupled with adaption algorithms, the receiver can compensate for slow variations in power amplifier characteristics, where adjacent channel interference is created by power amplifier nonlinearities. Simulation results demonstrate that the postdistortion technique can make an improvement in out-of-band emission by up to 15 dB; the corresponding increase in transmitter power efficiency is approximately a factor of five

Keywords

interference suppression; intermodulation; mobile radio systems; power amplifiers; radio transmitters; radiofrequency interference; AM-AM nonlinearities; AM-FM nonlinearities; adaptive postdistortion; adjacent channel interference; base station receiver; intermodulation; mobile radio; out-of-band emission; portable transmitter power efficiency; power amplifier nonlinearities; spectral-efficiency; Base stations; Batteries; High power amplifiers; Interchannel interference; Linearity; Mobile communication; Power amplifiers; Radio spectrum management; Transceivers; Transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1992, IEEE 42nd

Conference_Location

Denver, CO

ISSN

1090-3038

Print_ISBN

0-7803-0673-2

Type

conf

DOI

10.1109/VETEC.1992.245278

Filename

245278