Improvement of FM demodulator with cochannel FM interference

Author

Jong, G.J. ; Moir, T.J. ; Pettigrew, A.M. ; Su, T.-J.

Author_Institution

Dept. of Electron. Eng., Nat. Kaohsiung Inst. of Technol., Taiwan

Volume

35

Issue

20

fYear

1999

fDate

9/30/1999 12:00:00 AM

Firstpage

1758

Lastpage

1759

Abstract

Originally, frequency modulation (FM) was conceived to minimise the effect of additive noise. Since additive noise is the principal source of signal corruption in amplitude modulation (AM). The pre-cursor of frequency modulation. When the FM signal is received, the additive noise is removed by the action of a limiter. This process is a necessary part of FM demodulation. There are a number of ways to recover the modulating signal from the FM signal to improve cochannel interference (CCI). Without hard limiting, the signal is corrupted by both phase noise and by amplitude noise. It had not been possible to achieve FM demodulation without first using a hard limiter. Not until the realisation of the amplitude-locked loop (ALL)

Keywords

amplitude modulation; cochannel interference; demodulation; frequency modulation; optical fibre communication; optical noise; phase noise; FM demodulation; FM demodulator; FM signal; additive noise; amplitude modulation; amplitude noise; amplitude-locked loop; cochannel FM interference; cochannel interference; frequency modulation; limiter; signal corruption;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el:19991172

Filename

811168