利用最佳相干载波系统改进CATV传输

W. Krick
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引用次数: 7

摘要

针对未来多信道CATV传输系统的发展,讨论了利用相位相干图像载波来减少线路中继器放大器中出现的互调和交叉调制失真的方法。本文提供了用于比较传动性能的实验数据和理论数据。在此基础上,对非连贯性操作进行了审查。为了评估相干系统的改进,研究了最佳载波相位关系问题。实验结果表明,如果根据通过优化找到的特定代码来调整相位,则可以抑制失真。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Improvement of CATV Transmission Using an Optimum Coherent Carrier System
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.
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