GCMAC-based predistortion for digital modulations

Author

González-Serrano, Francisco-Javier ; Murillo-Fuentes, Juan José ; Artés-Rodríguez, Antonio

Author_Institution

Dept. Teoria de la Senal y Comunicaciones, Univ. Carlos III, Madrid, Spain

Volume

49

Issue

9

fYear

2001

fDate

9/1/2001 12:00:00 AM

Firstpage

1679

Lastpage

1689

Abstract

The subject of this paper is the compensation for nonlinearities in digital communication systems by means of predistortion. In this work, we apply the generalized cerebellar model articulation controller (GCMAC) to simplify and accelerate the predistorter convergence. The range of analyzed predistorters includes: 1) a symbol-rate data predistorter that, for a given time span, achieves a similar level of compensation provided by present techniques, but with faster convergence; 2) a fractionally spaced data predistorter that controls, at the same time, the signal constellation and the transmitted spectrum; 3) a decision-feedback scheme that compensates for remote nonlinearities; and 4) a digital signal data predistorter. The performance of the proposed data and signal predistorters is evaluated using typical linear and nonlinear modulated transmitted signals such as QAM and GMSK

Keywords

compensation; digital radio; minimum shift keying; neural nets; nonlinear distortion; quadrature amplitude modulation; telecommunication computing; GCMAC; GCMAC-based predistortion; GMSK; QAM; compensation; decision-feedback scheme; digital communication systems; digital modulations; digital signal data predistorter; fractionally spaced data predistorter; generalized cerebellar model arithmetic computer; generalized cerebellar model articulation controller; linear modulated transmitted signals; nonlinear modulated transmitted signals; nonlinearities; performance; predistorter convergence; remote nonlinearities; signal constellation; symbol-rate data predistorter; transmitted spectrum; Acceleration; Communication system control; Constellation diagram; Control nonlinearities; Convergence; Digital communication; Digital modulation; Predistortion; Quadrature amplitude modulation; Signal analysis;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.950354

Filename

950354