HOME>Exhibition>Transmission Technologies for the Next Generation of Satellite Broadcasting
We are researching next-generation satellite broadcasting systems for the large transmission capacity needed for Super Hi-Vision. This exhibit describes the Engineering Model developed for new satellite broadcasting in the 21-GHz band and the transmission technology for improving the quality of transmitted signals by compensating the distortion that occurs in satellite transponders.
- Engineering model of transponder for 21-GHz band broadcasting satellite
- Assuming that the 600-MHz bandwidth in the band 21.4-22.0 GHz allocated to the satellite broadcasting will be split into two channels, we are researching on-board equipments to transmit a wideband signal using a bandwidth of approximately 300 MHz. As a part of the research, we are developing an engineering model of the satellite transponder to evaluate the mechanical and electrical performance in the harsh environment of outer space by performing terrestrial verification tests.
- Compensator for satellite transponder distortion
- Transmissions that pass through the satellite transponder are distorted by the transponder's transfer characteristics. We developed a device that compensates for this distortion by estimating the distortion vector that will occur in the transponder and adding the inverse of this vector to the baseband signal before it is modulated. The distortion compensation is performed in a compensator located at the uplink earth station.
In the works
We will continue developing 21-GHz band satellite broadcasting systems toward test broadcasting of Super Hi-Vision.
Engineering model of transponder for 21-GHz band broadcasting satellite
Improvement of received data constellation with a satellite transponder distortion compensator