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Unbalanced quadriphase demodulatorA new and improved apparatus and method are described for demodulation of quaternary phase shift keyed (QPSK) data, particularly unbalanced QPSK. Phase adjustment of the output of a phase locked loop local oscillator is performed to reduce sensitivity to amplitude variations internal to the demodulator.
Document ID
19770017387
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Koybayashi, H. S. (NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Bradfield, S. P., III (NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Date Acquired
August 8, 2013
Publication Date
May 31, 1977
Subject Category
Communications And Radar
Report/Patent Number
Patent Application Number: US-PATENT-APPL-SN-692414
Patent Number: NASA-CASE-MSC-14840-1
Patent Number: US-PATENT-4,027,265
Accession Number
77N24331
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
NASA-CASE-MSC-14840-1|US-PATENT-4,027,265
Patent Application
US-PATENT-APPL-SN-692414

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