Probability density function of intermodulation distortions in CATV system

Abstract

In muti-channel CATV transmission systems, non-linearity of amplifiers causes intermodulation(IM). IM distortions impair the signal in CATV transmission and degrade the BER in digital channels. We have measured probability density function(p.d.f.) of IM in various conditions, and studied on relation between p.d.f. and BER of 64QAM.