ケーブルテレビシステムにおける相互変調歪みのディジタル伝送への影響(<論文特集>ディジタル放送)

概要

論文の詳細を見る
In multi-channel cable transmission systems, the non-linearity of a laser diode or an amplifier causes a number of intermodulation (IM) distortions (CSO, CTB, etc). IM distortions and thermal noise impair the digital signal in cable transmission and degrade the BER of digital channels. In order to find out the relationship between the IM distortions and the BER, the authors measured the interference's amplitude distribution in a channel. Experimental results show that the amplitude distribution of interference, including the IM distortion and thermal noise, differs from a Gaussian distribution. The distributions depend not only on its power but also on the kind of IM (CSO or CTB), the number of components, and the CN ratio. We performed a computer simulation of the experimental setup. The results of the simulation matched well with the measured results from the experiment.
社団法人映像情報メディア学会の論文
1997-09-20