A new class of IJF-OQPSK modems for regenerative satellite systems
Abstract
The potential applications of a new class of Intersymbol-Interference and Jitter Free Offset-Keyed Quadrature Phase Shift Keying (IJF-OQPSK) modems to regenerative satellite systems are presented. The properties of IJF-OQPSK signals in linear and hardlimited channels are summarized. The spectral spreading and probability of error (Pe) performance of IJF-OQPSK modems in conventional and regenerative satellite channels are studied and compared to those of QPSK modems using computer simulation techniques. The results show that IJF-OQPSK modems perform much better than QPSK in both cascaded nonlinear channels and regenerative satellite links, specially with saturated earth station HPA and transponder TWTA. It is also indicated that a gain of more than 2 dB at a Pe of 10 to the -6th can be obtained with regenerative satellite systems, relative to conventional cascaded nonlinear channels with IJF-OQPSK modems.
- Publication:
-
ICC 1981; International Conference on Communications, Volume 2
- Pub Date:
- 1981
- Bibcode:
- 1981icc.....2R..37L
- Keywords:
-
- Data Transmission;
- Intersymbolic Interference;
- Modems;
- Multichannel Communication;
- Performance Prediction;
- Phase Shift Keying;
- Transmission Efficiency;
- Communication Satellites;
- Computerized Simulation;
- Error Analysis;
- Ground Stations;
- Probability Theory;
- Systems Simulation;
- Transponders;
- Communications and Radar