A new analog predistortion criterion with application to high efficiency digital radio links

Author

Benedetto, Maria-Gabriella Di ; Mandarini, Paolo

Author_Institution

INFOCOM Dept., Rome Univ., Italy

Volume

43

Issue

12

fYear

1995

fDate

12/1/1995 12:00:00 AM

Firstpage

2966

Lastpage

2974

Abstract

Describes a new approach for designing analog cubic predistorters in view of minimizing nonlinear distortion introduced by the high power amplifier (HPA) in microwave radio links. The approach is based on a global mean squared error minimization between the input to the predistorter and the output of the power amplifier, rather than on the elimination of the cubic term. In this manner, two advantages are obtained. Firstly, the off-band distortion terms are reduced so that it is possible to eliminate the HF transmission filter. Secondly, the interference produced by the nonlinear distortion can be uniformly distributed over the entire constellation so that it is possible to reduce the back-off value of the HPA. Results of the application of the method proposed to some high spectrally efficient QAM systems, such as the 512-QAM system, are presented

Keywords

digital radio; electric distortion; interference suppression; least mean squares methods; microwave links; microwave power amplifiers; quadrature amplitude modulation; 512-QAM; HF transmission filter; QAM systems; analog predistortion criterion; back-off value; global mean squared error minimization; high efficiency digital radio links; high power amplifier; interference; microwave radio link; nonlinear distortion; off-band distortion; Chirp modulation; Digital communication; Filtering; Nonlinear distortion; Power amplifiers; Predistortion; RF signals; Radio frequency; Radio link; Radiofrequency amplifiers;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.477499

Filename

477499