A rejection system for interference in TV reception caused by sporadic-E ionospheric propagation

Author

Arata, Hiroo ; Yamazaki, Shigeru

Author_Institution

NHK Sci. & Tech. Res. Lab., Tokyo, Japan

Volume

35

Issue

1

fYear

1989

fDate

3/1/1989 12:00:00 AM

Firstpage

63

Lastpage

69

Abstract

A method to cancel interference waves by extracting them from TV signals through quadrature synchronous detection and then transforming the signals with a Hilbert transform method is introduced. The system eliminates interference waves at any frequency within the TV signal band. It is easily applied to rebroadcast stations, since it is possible to cancel interference waves at the intermediate-frequency stage. The system automatically eliminates a maximum of five interference waves. It suppresses interference waves by more than 40 dB at a desired-to-undesired signal ratio of 10 dB. The system will greatly contribute to eliminating abnormal interference waves caused by the sporadic-E layer as well as other undesired interference with TV signals.<>

Keywords

interference suppression; ionospheric electromagnetic wave propagation; radiowave propagation; sporadic-E layer; television interference; television reception; television stations; television systems; Hilbert transform; TV interference rejection; TV reception; TV signals; desired-to-undesired signal ratio; interference suppression; interference waves cancellation; quadrature synchronous detection; radiowave propagation; rebroadcast stations; sporadic-E ionospheric propagation; sporadic-E layer; Adaptive arrays; Amplitude modulation; Frequency; Interference cancellation; Interference elimination; Interference suppression; Laboratories; Polarization; TV broadcasting; TV interference;

fLanguage

English

Journal_Title

Broadcasting, IEEE Transactions on

Publisher

ieee

ISSN

0018-9316

Type

jour

DOI

10.1109/11.18766

Filename

18766