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Coherent receiver employing nonlinear coherence detection for carrier trackingThe concept of nonlinear coherence employed in carrier tracking to improve telecommunications efficiency is disclosed. A generic tracking loop for a coherent receiver is shown having seven principle feedback signals which may be selectively added and applied to a voltage controlled oscillator to produce a reference signal that is phase coherent with a received carrier. An eighth feedback signal whose nonrandom components are coherent with the phase detected and filtered carrier may also be added to exploit the sideband power of the received signal. A ninth feedback signal whose nonrandom components are also coherent with the quadrature phase detected and filtered carrier could be additionally or alternatively included in the composite feedback signal to the voltage controlled oscillator.
Document ID
19740022410
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Lindsey, W. C. (NASA Pasadena Office CA, United States)
Simon, M. K. (NASA Pasadena Office CA, United States)
Date Acquired
September 3, 2013
Publication Date
August 6, 1974
Subject Category
Structural Mechanics
Accession Number
74N30523
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-3,828,138|NASA-CASE-NPO-11921-1
Patent Application
US-PATENT-APPL-SN-359039

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