Persistent Link:
http://hdl.handle.net/10150/612269
Title:
USE OF FORWARD ERROR CORRECTION IN A GROUND-TO-AIR-TO-GROUND TELEMETRY AND CONTROL LINKS
Author:
Gardner, S.; Levy, E.
Issue Date:
1983-10
Rights:
Copyright © International Foundation for Telemetering
Collection Information:
Proceedings 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.
Publisher:
International Foundation for Telemetering
Journal:
International Telemetering Conference Proceedings
Abstract:
A forward error correcting (FEC) codec/interleaving system has been developed to improve the signal to noise ratio of a full duplex channel composed of a low rate command and control uplink and a high rate telemetry downlink. The system includes two MIL spec airborne 20 square inch cards and a ruggedized modified LINKABIT standard LV7017HS Convolutional Encoder Viterbi Decoder Ground Unit. The coding parameters used are code rate 1/2, constraint length K=7, 8 levels of soft decision and data rates of up to 20 Kbps for the command link and up to 10 Mbps in the telemetry downlink. Since Viterbi Decoders work best on memoryless Gaussian Noise channels, interleaving is used to randomize the effects of fading, jamming or other bursty types of noise making them appear like white Guassian additive noise to the decoder. A coherent binary PSK modem will ideally provide 10^-5 bit error rate (BER) with Eb/No = 9.6 dB (bit energy per noise ratio). The use of the FEC codecs in the sort decision mode achieves the same BER with 5 dB lower Eb/No, meaning either an increase of the communication range with the same RF equipment or substantial decrease of RF power or antenna size for the same communication range. The same system could be used in a hard decision mode and still provide a gain of more than 3 dB at BER of 10^-5. The coding gain increases as the required BER decreases. The described system could be easily adapted to any command and control link or telemetry link at the above mentioned data rates.
Sponsors:
International Foundation for Telemetering
ISSN:
0884-5123; 0074-9079
Additional Links:
http://www.telemetry.org/

Full metadata record

DC FieldValue Language
dc.language.isoen_USen
dc.titleUSE OF FORWARD ERROR CORRECTION IN A GROUND-TO-AIR-TO-GROUND TELEMETRY AND CONTROL LINKSen_US
dc.contributor.authorGardner, S.en
dc.contributor.authorLevy, E.en
dc.date.issued1983-10-
dc.rightsCopyright © International Foundation for Telemeteringen
dc.description.collectioninformationProceedings 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.en
dc.publisherInternational Foundation for Telemeteringen
dc.description.abstractA forward error correcting (FEC) codec/interleaving system has been developed to improve the signal to noise ratio of a full duplex channel composed of a low rate command and control uplink and a high rate telemetry downlink. The system includes two MIL spec airborne 20 square inch cards and a ruggedized modified LINKABIT standard LV7017HS Convolutional Encoder Viterbi Decoder Ground Unit. The coding parameters used are code rate 1/2, constraint length K=7, 8 levels of soft decision and data rates of up to 20 Kbps for the command link and up to 10 Mbps in the telemetry downlink. Since Viterbi Decoders work best on memoryless Gaussian Noise channels, interleaving is used to randomize the effects of fading, jamming or other bursty types of noise making them appear like white Guassian additive noise to the decoder. A coherent binary PSK modem will ideally provide 10^-5 bit error rate (BER) with Eb/No = 9.6 dB (bit energy per noise ratio). The use of the FEC codecs in the sort decision mode achieves the same BER with 5 dB lower Eb/No, meaning either an increase of the communication range with the same RF equipment or substantial decrease of RF power or antenna size for the same communication range. The same system could be used in a hard decision mode and still provide a gain of more than 3 dB at BER of 10^-5. The coding gain increases as the required BER decreases. The described system could be easily adapted to any command and control link or telemetry link at the above mentioned data rates.en
dc.description.sponsorshipInternational Foundation for Telemeteringen
dc.identifier.issn0884-5123-
dc.identifier.issn0074-9079-
dc.identifier.urihttp://hdl.handle.net/10150/612269-
dc.identifier.journalInternational Telemetering Conference Proceedingsen
dc.typetexten
dc.typeProceedingsen
dc.relation.urlhttp://www.telemetry.org/en
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