Quadrature-multiplex modulation system with application to the Orbiter's Ku-Band link
Abstract
This paper describes a new frequency multiplex scheme called quadrature-multiplex (QM) modulation which generates the interplexed signal with a simpler system structure and even smaller intermodulation loss than the interplex modulation system under a situation where the data rate of one signal is much greater than those of other signals to be multiplexed. A QM modulator and receiver systems are proposed. The performances of the QM systems are evaluated and compared to the interplex systems. Some design curves are obtained to help the communication systems engineer design the QM system. Finally, a signal is designed using the QM for the Orbiter's Ku-Band return link.
- Publication:
-
National Telecommunications Conference, Volume 2
- Pub Date:
- 1975
- Bibcode:
- 1975ntc.....2...33P
- Keywords:
-
- Data Links;
- Frequency Division Multiplexing;
- Frequency Modulation;
- Modems;
- Space Shuttle Orbiters;
- Superhigh Frequencies;
- Channels (Data Transmission);
- Intermodulation;
- Microwave Transmission;
- Spacecraft Communication;
- Systems Analysis;
- Space Communications, Spacecraft Communications, Command and Tracking