Transmission Techniques for Broadcast Satellites in the 21-GHz Band aiming for 'Super Hi-Vision' Broadcasting

摘要

In this paper, satellite broadcasting in the 21-GHz band is introduced. This satellite broadcasting can be expected to enable super hi-vision broadcasting that requires broadband satellite channels. It is also shown that up to about 3 channels of super hi-vision broadcasting can be achieved in case where super hi-vision transmission speed can be compressed to about 200 Mbps. It is also shown that rain attenuation countermeasure is an important issue to achieve stable satellite broadcast in the 21-GHz band. The long-period interleaving transmission scheme and a variable e.i.r.p broadcast satellite system using a phased array fed-reflector antenna are introduced as two potential ways of resolving the problem of rain attenuation. We presented the results of research on rain attenuation. In order to determine the transmitting power to compensate for rain attenuation for heavy rainfall regions, which is essential to the operation of the variable e.i.r.p. broadcast satellite system, a basic study of the distribution of the maximum 10-minute rainfall within hourly rainfall is conducted. From this study, it is shown that even when the hourly rainfall is the same, it should be considered to change the satellite transmitting power to compensate for rain attenuation in each region separately.