Wideband digital transmission experiments in the Intelsat V system
Abstract
Quaternary phase shift keying (QPSK) transmission through a 77-MHz bandwidth INTELSAT V F2 channel has been experimentally studied for the case of a 120-Mbit/sec transmission rate. Tests were also conducted for electrical path delay, transversal equalizer sensitivity, and the effects of QPSK spectrum regrowth on FM carrier performance. Equalization tests were successfully completed with both fixed and transversal equalizers. Extensive tests on the up- and down-path sensitivities to amplitude and group delay distortions revealed that the paths were sensitive to parabolic delay perturbations. Test procedures for measuring electrical path length with a time interval counter have been successfully demonstrated to within an estimated accuracy of 1 nsec.
- Publication:
-
COMSAT Technical Review
- Pub Date:
- 1983
- Bibcode:
- 1983COMTR..13..275C
- Keywords:
-
- Channels (Data Transmission);
- Intelsat Satellites;
- Phase Shift Keying;
- Pulse Communication;
- Time Division Multiple Access;
- Wideband Communication;
- Channel Noise;
- Data Links;
- Delay Lines;
- Equalizers (Circuits);
- Signal Processing;
- Stability Tests;
- Communications and Radar