NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Resolving Phase Ambiguities In OQPSKImproved design for modulator and demodulator in offset-quaternary-phase-key-shifting (OQPSK) communication system enables receiver to resolve ambiguity in estimated phase of received signal. Features include unique-code-word modulation and detection and digital implementation of Costas loop in carrier-recovery subsystem. Enchances performance of carrier-recovery subsystem, reduces complexity of receiver by removing redundant circuits from previous design, and eliminates dependence of timing in receiver upon parallel-to-serial-conversion clock.
Document ID
19910000301
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Nguyen, Tien M.
(Caltech)
Date Acquired
August 14, 2013
Publication Date
July 1, 1991
Publication Information
Publication: NASA Tech Briefs
Volume: 15
Issue: 7
ISSN: 0145-319X
Subject Category
Electronic Systems
Report/Patent Number
NPO-17853
Accession Number
91B10301
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

There are no available downloads for this record.
No Preview Available