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Critique of the Hughes Aircraft shuttle Ku band leading edge bit synchronizerA bit synchronizer is analyzed via timing diagrams in a noise-free environment. It is believed that this new bit synchronizer will track the rising edge of the data bits with 25% asymmetry and up to a 90 deg phase shift between the received clock and data bit timing. In addition, the data bits will be demodulated correctly. It is not true that phase shifts larger than 90 deg will necessarily be corrected by this bit synchronizer. However, the specifications currently require the loop to operate over only a + or - 75 deg phase shift between the received data stream leading edges and the bit synchronizer leading edges; consequently, there should be no problem.
Document ID
19800017025
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Holmes, J. K.
(Axiomatix Los Angeles, CA, United States)
Date Acquired
September 4, 2013
Publication Date
May 5, 1980
Subject Category
Communications And Radar
Report/Patent Number
NASA-CR-160661
R8005-2
Report Number: NASA-CR-160661
Report Number: R8005-2
Accession Number
80N25521
Funding Number(s)
CONTRACT_GRANT: NAS9-15795
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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