A postdistortion receiver for mobile communications

Author

Quach, L.D. ; Stapleton, S.P.

Author_Institution

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

fYear

1993

fDate

18-20 May 1993

Firstpage

734

Lastpage

737

Abstract

A postdistortion receiver for possible future mobile communication systems that can increase both the spectral efficiency and the transmitter´s power efficiency is presented. Postdistortion is a technique, implemented at the base-station receiver, to compensate for AM-AM and AM-PM nonlinearities of a mobile transmitter´s amplifier, which, if uncompensated, would cause adjacent channel interference. A new adaptation method is demonstrated to compensate for slow variations in power amplifier characteristics without an interruption for a training period. The simulation and measured results show that the postdistortion technique can improve the out-of-band emission by up to 20 dB; the corresponding increase in mobile transmitter power efficiency is approximately a factor of 10. The spectral efficiency is increased by 20% with the postdistortion implementation

Keywords

adaptive signal processing; adjacent channel interference; compensation; fading; intermodulation distortion; land mobile radio; radio receivers; technological forecasting; adjacent channel interference; base-station receiver; future; mobile communications; mobile transmitter power efficiency; nonlinearities; out-of-band emission; postdistortion receiver; power amplifier characteristics; simulation; spectral efficiency; variance-based adaptation; Base stations; Hardware; High power amplifiers; Interference; Laboratories; Mobile communication; Power amplifiers; Power engineering and energy; Quadrature phase shift keying; Transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1993., 43rd IEEE

Conference_Location

Secaucus, NJ

ISSN

1090-3038

Print_ISBN

0-7803-1267-8

Type

conf

DOI

10.1109/VETEC.1993.508796

Filename

508796