Title :
Performance of adaptive data predistortion applied to 22N-QAM radio systems
Author :
Vandamme, Patrick ; Bourgeade, Lament
Author_Institution :
CNET, Lannion, France
fDate :
28 Nov-1 Dec 1988
Abstract :
The performance of adaptive data predistortion for combatting high-power amplifier (HPA) nonlinearities is investigated for 22N -QAM (quadrature amplitude modulation) techniques in a digital radio context. The transmission filtering is assumed to be performed before the nonlinear amplification. Using the service channel facilities, the updating process does not require doubling the demodulation operation. Results expressed in terms of flat-fade margin gain show that a 2- to 3-dB improvement can be obtained with algorithms of reasonable complexity. Experimental results for a 16-QAM 140 Mb/s setup confirm the validity and the potential interest of the technique
Keywords :
amplitude modulation; digital communication systems; fading; radio systems; radiowave propagation; 140 Mbit/s; 16-QAM; adaptive data predistortion; algorithms; digital radio systems; flat-fade margin gain; high power amplifier nonlinearities; nonlinear amplification; quadrature amplitude modulation; service channel facilities; transmission filtering; Adaptive filters; Baseband; Constellation diagram; Equalizers; Filtering; Gain; Interference cancellation; Intersymbol interference; Nonlinear distortion; Predistortion;
Conference_Titel :
Global Telecommunications Conference, 1988, and Exhibition. 'Communications for the Information Age.' Conference Record, GLOBECOM '88., IEEE
Conference_Location :
Hollywood, FL
DOI :
10.1109/GLOCOM.1988.25846
