NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
(abstract) MCD3 - A Constraint Length 15 Viterbi DecoderJPL is responsible for many space missions, as part of NASA's continuing unmanned exploration of the solar system. Signals from spacecraft at planetary distances arrive at Earth with poor S/N ratio. To reduce errors, the signals are encoded with an inner code of Viterbi encoding. One of the key parameters of Viterbi encoding is the constraint length. Previous space missions have used a constraint length of 7. Newer missions use 15, to give a considerably improved error correction ability. However, the complexity of the Viterbi decoder is increased so as to be 256 times more complex.
Document ID
20060036498
Acquisition Source
Jet Propulsion Laboratory
Document Type
Preprint (Draft being sent to journal)
External Source(s)
Authors
Buchanan, Jeff
Burke, Gary
Graham, Scott
Johnson, Robert
Kowalski, Jim
Nakahira, Sho
Stone, Earnest
Tung, Ramona
Whitaker, Bill
Date Acquired
August 23, 2013
Publication Date
September 8, 1996
Subject Category
Communications And Radar
Distribution Limits
Public
Copyright
Other
Keywords
communications
Viterbi encoding signal to noise ratio constraint length error correction MCD3

Available Downloads

There are no available downloads for this record.
No Preview Available