NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Coherent Digital Demodulation of a Residual Carrier Signal Using IF SamplingAn analysis is presented of a digital technique for the coherent demodulation of a residual carrier signal with a biphase modulated square wave subcarrier. The processing technique employs the concept of intermediate frequencies IF sampling. An optimum Costas loop is used for subcarrier demodulation and data-aided carrier tracking, i.e., combined Costas and residual carrier tracking. It is shown that the loops perform essentially the same as the corresponding analog loops in terms of signal-to-noise ratio and loop bandwidth. The sampling does not introduce biases or other significant effects on the loops, provided that the loop bandwidth is very small compared to the symbol rate, and that the number of samples per symbol is large compared to inverse loop bandwidth.
Document ID
19840024563
Document Type
Reprint (Version printed in journal)
Authors
Sfeir, R. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Aguirre, S. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Hurd, W. J. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 12, 2013
Publication Date
August 15, 1984
Publication Information
Publication: The Telecommun. and Data Acquisition Rept.
Subject Category
COMMUNICATIONS AND RADAR
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

IDRelationTitle19840024551Analytic PrimaryThe Telecommunications and Data Acquisition Report
Document Inquiry