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Coded spread spectrum digital transmission system design studyResults are presented of a comprehensive study of the performance of Viterbi-decoded convolutional codes in the presence of nonideal carrier tracking and bit synchronization. A constraint length 7, rate 1/3 convolutional code and parameters suitable for the space shuttle coded communications links are used. Mathematical models are developed and theoretical and simulation results are obtained to determine the tracking and acquisition performance of the system. Pseudorandom sequence spread spectrum techniques are also considered to minimize potential degradation caused by multipath.
Document ID
19740019511
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Heller, J. A. (Linkabit Corp. San Diego, CA, United States)
Odenwalder, J. P. (Linkabit Corp. San Diego, CA, United States)
Viterbi, A. J. (Linkabit Corp. San Diego, CA, United States)
Date Acquired
September 3, 2013
Publication Date
May 1, 1974
Subject Category
Communications
Report/Patent Number
NASA-CR-134310
Accession Number
74N27624
Funding Number(s)
CONTRACT_GRANT: NAS9-13733
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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