Adaptive nulling loop control for 1.7-GHz feedforward linearization systems

Author

Eid, Eid E. ; Ghannouchi, Fadhel M.

Author_Institution

Ampli Project, Ecole Polytech. de Montreal, Que., Canada

Volume

45

Issue

1

fYear

1997

fDate

1/1/1997 12:00:00 AM

Firstpage

83

Lastpage

86

Abstract

An adaptive analog control system is introduced for the nulling loop (first loop) of a 1.7-GHz feedforward linearization system. The sensitivity to temperature and frequency variations is experimentally shown for a conventional feedforward system, leading to the need for an adaptive control system. Two error signals based on detected power levels are introduced and used to control the nulling loop vector modulator to ensure cancellation of the main signal. Finally, the experimental performance of this system is presented

Keywords

adaptive control; feedforward; modulators; telecommunication control; 1.7 GHz; adaptive nulling loop control; analog control system; communication systems; detected power levels; error signals; feedforward linearization systems; frequency variations; temperature variations; vector modulator; Adaptive control; Amplitude modulation; Control systems; Feedforward systems; Frequency; Multiaccess communication; Open loop systems; Programmable control; Quadrature amplitude modulation; Temperature sensors;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.552035

Filename

552035