Optimal control of intermodulation distortion in hybrid fiber-coaxial CATV systems

Author

Alley, Gary D. ; Kuo, Yen-Long

Author_Institution

Bell Labs, Lucent Technol., North Andover, MA, USA

Volume

45

Issue

12

fYear

1997

fDate

12/1/1997 12:00:00 AM

Firstpage

2183

Lastpage

2196

Abstract

The distortion optimization in a phase-controlled hybrid fiber coaxial (HFC) CATV system is presented both in the frequency domain and in the time domain. A general quadratic-phase relationship of the National Television System Community (NTSC) video carriers has been used as the basis for minimizing the peak/rms ratio of the broad-band signal as well as the second- and third-order intermodulation distortion products. Emphasis is placed on distortion products which fall outside the band occupied by the NTSC signals and thus degrade digital performance. An experimental phase-controlled coherent HFC CATV system consisting of 81 live video channels and four 64 quadrature amplitude modulation (QAM) digital channels has been used to demonstrate the advantages of an optimal phase-controlled headend over traditional systems

Keywords

cable television; coaxial cables; intermodulation distortion; optical cables; optimal control; NTSC signal; National Television System Community; QAM digital channel; broad-band signal; frequency domain; hybrid fiber-coaxial CATV system; intermodulation distortion; optimal control; peak/rms ratio; phase-controlled coherent system; quadratic-phase relationship; time domain; video channel; Coaxial components; Digital modulation; Hybrid fiber coaxial cables; Intermodulation distortion; Optimal control; Phase distortion; Quadrature amplitude modulation; Signal design; Signal to noise ratio; TV;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.643814

Filename

643814