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Three Alternative Symbol-Lock DetectorsThree symbol-lock detectors proposed as alternatives in advanced receivers processing non-return-to-zero binary data signals. Two perform operations similar to those of older square-law and absolute-value types. However, integrals computed during nonoverlapping symbol periods and, therefore, only one integrator needed in each such detector. Proposed detectors simpler, but performances worse because noises in overlapping samples correlated, whereas noises in nonoverlapping samples not correlated. Third detector is signal-power-estimator type. Signal integrated during successive half symbol cycles, and therefore only one integrator needed. Half-cycle integrals multiplied to eliminate effect of symbol polarity, and products accumulated during M-cycle observation period to smooth out estimate of signal power. If estimated signal power exceeds threshold, delta, then lock declared.
Document ID
19930000555
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Shihabi, Mazen M.
(Caltech)
Hinedi, Sami M.
(Caltech)
Shah, Biren N.
(Caltech)
Date Acquired
August 16, 2013
Publication Date
September 1, 1993
Publication Information
Publication: NASA Tech Briefs
Volume: 17
Issue: 9
ISSN: 0145-319X
Subject Category
Electronic Systems
Report/Patent Number
NPO-18521
Accession Number
93B10555
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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