DocumentCode :
771067
Title :
An Automatically Controlled Predistorter for Multilevel Quadrature Amplitude Modulation
Author :
Namiki, Junji
Author_Institution :
Nippon Electric Company, Ltd., Japan
Volume :
31
Issue :
5
fYear :
1983
fDate :
5/1/1983 12:00:00 AM
Firstpage :
707
Lastpage :
712
Abstract :
In digital microwave transmission, the nonlinear characteristics in a high power amplifier, such as a TWT (traveling-wave tube) inhibit efficient output use. This note introduces a new predistorter control technique, and assesses the nonlinear compensation capability of a third-order predistorter incorporating this technique. Concerning 16-QAM (quadrature amplitude modulation) a 10 dB reduction in out-of-band emission and larger than 8 dB 
improvement with respect to symbol error rate can be achieved at 3 dB TWT average output power backoff.
improvement with respect to symbol error rate can be achieved at 3 dB TWT average output power backoff.Keywords :
Microwave communications; Quadrature amplitude modulation; Traveling wave amplifiers; Automatic control; Communication system control; Digital communication; High power amplifiers; Nonlinear distortion; Predistortion; Pulse amplifiers; Quadrature amplitude modulation; Satellite broadcasting; Satellite ground stations;
fLanguage :
English
Journal_Title :
Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
0090-6778
Type :
jour
DOI :
10.1109/TCOM.1983.1095870
Filename :
1095870
Link To Document :
