Adaptive control method for a feedforward amplifier

Author

Kang, Sanggee ; Song, MyungSun ; Yi, Huimin ; Hong, Sungyong

Author_Institution

Adv. Radio Technique Dept., ETRI, South Korea

Volume

2

fYear

2004

fDate

17-19 May 2004

Firstpage

1182

Abstract

A feedforward amplifier, which is composed of several components, is an open loop system. Therefore, feedforward amplifiers are apt to deteriorate in their performance according to environmental changes, even though the cancellation performance and the linearization bandwidth of feedforward systems are superior to other linearization methods. A control method is needed to maintain the original performance of feedforward amplifiers or to keep the desired performance within small error bounds. In this paper, an adaptive control method, using the steepest descent algorithm, which has a good convergence characteristic and is easy to implement, is suggested. The characteristics of the suggested control method are compared with the characteristics of other control methods and the simulation results are presented.

Keywords

adaptive control; amplifiers; convergence; feedforward; least mean squares methods; linearisation techniques; open loop systems; LMS algorithm; adaptive amplifier control method; convergence; feedforward amplifier; linearization bandwidth; open loop system; predistortion system; steepest descent algorithm; Adaptive control; Bandwidth; Control systems; Convergence; Degradation; Error correction; Frequency; Monitoring; Open loop systems; Power amplifiers;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2004. VTC 2004-Spring. 2004 IEEE 59th

ISSN

1550-2252

Print_ISBN

0-7803-8255-2

Type

conf

DOI

10.1109/VETECS.2004.1389019

Filename

1389019