Study and simulation on clipping-induced impulse noise for video performance of hybrid AM/QAM fiber CATV system

• Main Author: 洪智仁
• Other Authors: 賴柏洲
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/47740155946453171798

碩士 === 國立臺北科技大學 === 電腦通訊與控制研究所 === 88 === The influence of impulsive nonlinear noise caused by occasional “clipping” of the subcarrier multiplexing signal on laser diode in the hybrid AM/QAM SCM fiber CATV system is discussed in the thesis. The clipping noise can be described as a Poisson impulse train and its main influence in the hybrid system is the BER degradation of the M-ary QAM television signal. One of the subjects in the thesis is the computer simulation of the hybrid AM/QAM SCM fiber CATV system with one or more M-ary QAM digital television channels using the cable digital television standard DVB-C proposed by DVB project in Europe. With the simulating results, we can predict and observe the BER performance affected by the clipping noise of the M-ary QAM channel in the hybrid AM/QAM system. At last, we propose a simple method to determine the maximum number of M-ary QAM channels which can add to an existing AM SCM fiber CATV system for upgrading to a hybrid AM/QAM SCM fiber CATV system.