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The effects of bandpass limiters on n-phase tracking systemsThe combination of a bandpass limiter and an n-th power tracking loop is considered. Performance of the combination does not depend on the form of the nonlinear function used to create the n-th harmonic signal as long as some energy in that zone is produced. The order in which the limiter and n-th power nonlinearity occur is unimportant so that the results apply equally well to the n-phase Costas type of implementations of the n-th power loops. Closed form expressions for the signal suppression factors are obtained. Coherent and noncoherent SNR's out of the n-th power-limiter combination can be expressed in terms of two of these suppression factors. The loop SNR of an n-th power-limited phase locked loop is estimated by simply calculating the suppression factors for n-th and 2n-th power loops. Finally, n-th power phase locked loops without limiters are compared with similar loops with limiters; the limiter can actually enhance output SNR at moderate to large input SNR.
Document ID
19770053895
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Butman, S. A.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Lesh, J. R.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena Calif., United States)
Date Acquired
August 9, 2013
Publication Date
June 1, 1977
Publication Information
Publication: IEEE Transactions on Communications
Volume: COM-25
Subject Category
Electronics And Electrical Engineering
Accession Number
77A36747
Funding Number(s)
CONTRACT_GRANT: NAS7-100
Distribution Limits
Public
Copyright
Other

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