System for characterizing phase-modulated signals using a time i

Details System for characterizing phase-modulated signals using a time i System for characterizing phase-modulated signals using a time i

1994-02-16

1996-05-21

Voeltz, Emanuel T.

Boots, shoes, and leggings

364484, 327 9, G01R 2300

Patent

active

055196250

ABSTRACT:
A system for characterizing phase modulated signals, e.g., .pi./4 DQPSK signals, includes a time interval analyzer coupled to a system processor for determining a variety of signal characterizing parameters as a function of readings made on a phase modulated signal by the analyzer. The system processor includes a phase/frequency determining section for generating a phase deviation curve and decoding the modulated signal. The system processor further includes a processing section for determining various signal defining parameters including origin offset and I/Q mismatch as a function of the phase deviation.

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Hewlett-Packard Journal, Feb. 1989, USA, vol. 40, No. 1, ISSN 0018-1153, pp. 28-35; D.C. Chu: "Phase Digitizing: A New Method for Capturing and Analyzing Spread-Spectrum Signals".
Hewlett-Packard Jounal, Feb. 1989, USA, vol. 40, No. 1, ISSN 0018-1153, pp. 35-41, Paul S. Stephenson, "Frequency and Time Interval Analyzer Measurement Hardware".
Birgenheier, "Measuring the Modulation Accuracy of .pi./4 DQPSK Signals for Digital Cellular Transmitters", Hewlett-Packard Journal , Apr. 1991, vol. 42, No. 2.

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