30/20 GHz band SCPC satellite communication
Abstract
A Japanese domestic satellite communications system which accomodates several 30/20 GHz band earth stations is presented. The system employs two types of earth stations: a master earth station (MES) and a small earth terminal (SET), and SET power utilization efficiency, system flexibility, and power control adaptability are improved by using a single channel per carrier (SCPC) demand assigned multiple access method. Earth station transmit powers are controlled using (1) constant earth station transmit power, (2) constant satellite power sharing, and (3) adaptive satellite power sharing. Tests results show that the MES to SET link bit error rate varies approximately 2 dB from the theoretical limit, due to intersymbol interference. An AFC method is used which does not employ a pilot signal receiver and is thus superior to conventional methods as it simplifies the SET. In addition, the adaptive satellite power sharing system compensates a path loss variation of 7 dB within + or - 1 dB. Future efforts include the improvement of the channel control technique, power control technique, and multilevel SCPC system design method.
- Publication:
-
Paris International Astronautical Federation Congress
- Pub Date:
- September 1982
- Bibcode:
- 1982pari.iafcQ....I
- Keywords:
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- Demand Assignment Multiple Access;
- Domestic Satellite Communications Systems;
- Earth Terminals;
- Japanese Spacecraft;
- Microwave Transmission;
- Satellite Communication;
- Single Channel Per Carrier Transmission;
- Adaptive Control;
- Atmospheric Attenuation;
- Channel Capacity;
- False Alarms;
- Microwave Switching;
- Network Control;
- Satellite Networks;
- Telephony;
- Transmission Efficiency;
- Communications and Radar