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Digital Baseband Architecture For TransponderProposed advanced transponder for long-distance radio communication system with turnaround ranging contains carrier-signal-tracking loop including baseband digital "front end." For reduced cost, transponder includes analog intermediate-frequency (IF) section and analog automatic gain control (AGC) loop at first of two IF mixers. However, second IF mixer redesigned to ease digitization of baseband functions. To conserve power and provide for simpler and smaller transponder hardware, baseband digital signal-processing circuits designed to implement undersampling scheme. Furthermore, sampling scheme and sampling frequency chosen so redesign involves minimum modification of command-detector unit (CDU).
Document ID
19950065414
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Nguyen, Tien M.
(Caltech)
Yeh, Hen-Geul
(Caltech)
Date Acquired
August 17, 2013
Publication Date
June 1, 1995
Publication Information
Publication: NASA Tech Briefs
Volume: 19
Issue: 6
ISSN: 0145-319X
Subject Category
Electronic Systems
Report/Patent Number
NPO-19330
Accession Number
95B10255
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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