Improvement of CATV Transmission Using an Optimum Coherent Carrier System
- 1 April 1980
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Cable Television
- Vol. CATV-5 (2), 65-71
- https://doi.org/10.1109/TCATV.1980.285809
Abstract
Aiming at the development of future multichannel CATV-transmission systems the utilization of phase-coherent picture carriers is discussed as a means of reducing intermodulation-and crossmodulation-distortion arising in the line repeater amplifiers. The paper presents experimental and theoretical data for comparison of transmission performance. As a basis the non-coherent operation is reviewed. In order to evaluate the improvement by a coherent system the problem of optimum carrier phase relation is investigated. Experimental results demonstrate the suppression of distortion, if the phases are adjusted according to a certain code which was found by optimization.Keywords
This publication has 2 references indexed in Scilit:
- Cross modulation and intermodulation in amplifiers at high frequenciesIEEE Journal of Solid-State Circuits, 1972
- Binary pulse compression codesIEEE Transactions on Information Theory, 1967