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Proceedings Paper

4PPM Modulator/Demodulator With Fully Digital Signal Regeneration
Author(s): S. Boerner; J. Heichler
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Paper Abstract

The 4PPM modulator/demodulator was developed as a breadboard model for the SILEX project of the ESA. The most important requirements placed upon this equipment is that it has to operate with any of four bit rates between 15 and 120 Mbit/s with minimal switch-over facilities, and that the demodulator has to accept from the optical receiver front end signals that are considerably distorted by band limitation. While the 4PPM modulator consists of a rather simple digital circuit, operable at all four bit rates, the 4PPM demodulator is composed of four units: The Input Section with bit rate-specific switchable filters, the Flash Comparator, where the selected input signal is digitized and sampled, the Maximum Likelihood Detector by which the maximal amplitude time slot is selected, and where the 4PPM/NRZ transformation is performed, and the Word-Error Integrator where the word clock is adjusted to its proper phase.

Paper Details

Date Published: 6 October 1989
PDF: 9 pages
Proc. SPIE 1131, Optical Space Communication, (6 October 1989); doi: 10.1117/12.961547
Show Author Affiliations
S. Boerner, ANT Nachrichtentechnik GmbH (Germany)
J. Heichler, ANT Nachrichtentechnik GmbH (Germany)


Published in SPIE Proceedings Vol. 1131:
Optical Space Communication

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