Title :
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
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;
Conference_Titel :
Vehicular Technology Conference, 1992, IEEE 42nd
Conference_Location :
Denver, CO
Print_ISBN :
0-7803-0673-2
DOI :
10.1109/VETEC.1992.245278
