NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Coordinated design of coding and modulation systemsThe joint optimization of the coding and modulation systems employed in telemetry systems was investigated. Emphasis was placed on formulating inner and outer coding standards used by the Goddard Spaceflight Center. Convolutional codes were found that are nearly optimum for use with Viterbi decoding in the inner coding of concatenated coding systems. A convolutional code, the unit-memory code, was discovered and is ideal for inner system usage because of its byte-oriented structure. Simulations of sequential decoding on the deep-space channel were carried out to compare directly various convolutional codes that are proposed for use in deep-space systems.
Document ID
19760018226
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Massey, J. L. (Notre Dame Univ. IN, United States)
Ancheta, T. (Notre Dame Univ. IN, United States)
Johannesson, R. (Notre Dame Univ. IN, United States)
Lauer, G. (Notre Dame Univ. IN, United States)
Lee, L. (Notre Dame Univ. IN, United States)
Date Acquired
September 3, 2013
Publication Date
June 14, 1976
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking
Report/Patent Number
NASA-CR-148163
Accession Number
76N25314
Funding Number(s)
CONTRACT_GRANT: NSG-5025
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available