Simulation of crosstalk in satellite video transmission
Abstract
One of the major problems of transmitting two TV channels (FM carriers) through one transponder of a communication satellite is the coherent crosstalk of one color subcarrier into the other, resulting in low frequency flicker. The amount of this visible effect depends on the characteristics of the satellite input filter, satellite amplifier nonlinearities, the amount of backoff given to the amplifier and the spacing between the carriers. As it is difficult to predict the crosstalk levels analytically, computer simulation is used to predict the performance. This paper describes the computer models and the experimental simulation results. Close agreement between the two is observed. A comparison between the crosstalk performances of a traveling wave tube amplifier (TWTA) and a newly developed solid state power amplifier (SSPA) is made. It is observed that in comparison with the TWTA, the SSPA can significantly reduce crosstalk.
- Publication:
-
ICC 1981; International Conference on Communications, Volume 2
- Pub Date:
- 1981
- Bibcode:
- 1981icc.....2...33J
- Keywords:
-
- Computerized Simulation;
- Crosstalk;
- Power Amplifiers;
- Satellite Television;
- Television Transmission;
- Traveling Wave Amplifiers;
- Color Television;
- Communication Satellites;
- Electromagnetic Wave Filters;
- Flicker;
- Linear Amplifiers;
- Solid State Devices;
- Communications and Radar