Title :
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
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;
Conference_Titel :
Vehicular Technology Conference, 1993., 43rd IEEE
Conference_Location :
Secaucus, NJ
Print_ISBN :
0-7803-1267-8
DOI :
10.1109/VETEC.1993.508796
