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Collection InformationProceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection.
AbstractThere are numerous applications for high data rate coding systems for earth orbiting space-missions with power limited links. Studies indicated that a 40 Mbps hard decision sequential decoder would best meet the requirements. A prototype decoder has been designed and fabricated using the fastest commercially available digital integrated circuits, MECL III. Thus far, an internal computational rate of 70 Million computations per second has been achieved. Computational efficiency of the decoding algorithm was greatly improved by incorporating two modifications to the Fano algorithm; “double quick threshold loosening” and “diagonal steps.” Preliminary results indicate that an output error rate of 10^-5 can be achieved with E(b)/N(o) less than 5.4 dB at data rates up to 40 Mbps. At lower data rates, even less signal energy is required. This decoder is believed to be at least 5 times faster than any previous sequential decoder.
SponsorsInternational Foundation for Telemetering