文章基本信息

标题：光ケーブルテレビシステムにおけるクリッピング歪の持続時間特性とディジタル伝送特性に与える影響
本地全文：下载
作者：倉掛卓也 ; 伊藤泰宏 ; 中村直義等
期刊名称：映像情報メディア学会誌
印刷版ISSN：1342-6907
电子版ISSN：1881-6908
出版年度：1998
卷号：52
期号：11
页码：1682-1689
DOI：10.3169/itej.52.1682
出版社：The Institute of Image Information and Television Engineers
摘要：In a hybrid analog (AM VSB) /digital (QAM) sub carrier multiplexed (SCM) optical cable TV system, clipping induced impulsive distortion occurs when the SCM signal's amplitude drops below the laser diode (LD) threshold This distortion may induce bursts of bit errors in digital channels We have investigated the duration of clipping induced distortion and its effect on the BER performance of QAM signals As a result, we found that the frequency accuracy of the analog sub carriers is one of the main factors that characterize the clipping induced impulsive distortion which affects the performance of the digital channel The more accurately the frequencies of the analog sub carriers are set, the longer the duration of the clipping induced distortions becomes If the duration exceeds the ability of the forward error correction (FEC) system, the FEC system will not work well because of the error bursts This factor has not been considered in previous approaches
关键词：光ケーブルテレビ;SCM光伝送;クリッピング歪;バースト誤り