Digital phase modulation methods giving a band-limited spectrum for satellite communications
Abstract
The paper surveys a new class of digital phase modulation methods which are designed to obtain very low out-of-band radiation of a hard-limiting radio transmitter without the use of output filtering. Attention is given to the main requirements for a digital modulation method for satellite communication in a multiple FDMA mode usable in small and simple ground terminals. Known modulation methods such as QPSK and MSK are examined regarding these requirements. Consideration is given to the need for spectrum control to reduce the out-of-band radiation to a lower level. Finally, the obtainable channel separation with TFM is indicated and some details of the receiver circuitry application in small ground terminals are discussed.
- Publication:
-
8th Communications Satellite Systems Conference
- Pub Date:
- 1980
- Bibcode:
- 1980coss.conf..391M
- Keywords:
-
- Communication Satellites;
- Digital Filters;
- Phase Modulation;
- Pulse Communication;
- Spectral Bands;
- Computer Systems Programs;
- Frequency Division Multiple Access;
- Ground Stations;
- Phase Shift Keying;
- Radio Transmitters;
- Satellite Communication;
- Communications and Radar