Interference from television carriers into narrowband digital carriers

Abstract

The authors present results of laboratory measurements of the power spectral density of various types of satellite television carriers modulated with live video in a way that can be readily utilized by satellite network operators wishing to protect their narrowband digital carriers according to CCIR Recommendation 523. From these results, it can be seen that, although for television carriers modulated with energy dispersal signal alone a large improvement in the interference situation can be obtained by replacing frame rate energy dispersal with other types of waveforms, the modulation of the carrier with live video will limit the benefit of the improvement since it will now represent the worst case. For this reason, a special operational procedure for the transmission of television carriers is suggested which could improve the interference situation without the need to replace the frame rate energy dispersal signal.<>