Digital demodulation with a non-ideal quantizer
Abstract
The use of digital demodulation techniques, or the conversion from analog to digital signal domains before data are demodulated from a radio frequency (RF) carrier, has become increasingly more feasible in recent years as logic circuit speeds increased. This feasibility was demonstrated by use in the Dual-Channel (Mu-II) Sequential Ranging System. Further use is contemplated in the telemetry stream, or integrated into the phase-tracking receiver. Some of the properties which must be considered in the analog-to-digital (A-D) converter to be used in these applications are presented. In particular, the loss to be expected with an A-D unit built from current circuitry is calculated.
- Publication:
-
The Deep Space Network
- Pub Date:
- April 1976
- Bibcode:
- 1976dsn..nasa..100L
- Keywords:
-
- Analog To Digital Converters;
- Demodulation;
- Counters;
- Logic Circuits;
- Signal To Noise Ratios;
- Telemetry;
- Communications and Radar