Physics
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982tdar.nasa...73d&link_type=abstract
In its The Telecommun. and Data Acquisition Progr. J. p 73-80 (SEE N83-14323 05-32)
Physics
Algorithms, Deep Space Network, Signal To Noise Ratios, Viterbi Decoders, Voyager 2 Spacecraft, Concatenated Codes, Data Transmission, Radio Frequencies
Scientific paper
The Viterbi decoders currently used by the Deep Space Network (DSN) employ an algorithm for maintaining node synchronization that significantly degrades at bit signal-to-noise ratios (SNRs) of below 2.0 dB. In a recent report by the authors, it was shown that the telemetry receiving system, which uses a convolutionally encoded downlink, will suffer losses of 0.85 dB and 1.25 dB respectively at Voyager 2 Uranus and Neptune encounters. This report extends the results of that study to a concatenated (255,223) Reed-Solomon/(7, 1/2) convolutionally coded channel, by developing a new radio loss model for the concatenated channel. It is shown here that losses due to improper node synchronization of 0.57 dB at Uranus and 1.0 dB at Neptune can be expected if concatenated coding is used along with an array of one 64-meter and three 34-meter antennas.
Deutsch Leslie J.
Miller Richard L.
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