Digital signal modulation analysis device

Details Digital signal modulation analysis device Digital signal modulation analysis device

1995-04-21

1998-03-03

Chin, Stephen

Pulse or digital communications

Testing

375316, 375228, 370 17, H04B 346, H04J 1700

Patent

active

057243883

ABSTRACT:
A digital signal modulation analysis device is to shorten the time for modulation analysis, and at the same time to structure a measurement device that is small in scale and inexpensive. A digital signal modulation analysis device includes a frequency converter which converts a signal from a device under test to a first intermediate frequency signal, a sampling part which converts the first intermediate frequency signal to a second intermediate-frequency signal whose frequency is lower than that of the first intermediate frequency to store the second intermediate frequency signal in a memory, a Hilbert converter which converts an incoming signal into orthogonal component signals through a quadrant-modulate detection process, an initial synchronization part which determines a carrier center frequency, a symbol-demodulation/parameter-estimation part which determines optimal parameters to minimize a modulation error and demodulates all symbol data to determine reference data for the all symbol data, and a modulation-precision calculation component which calculates modulation-precision data and modulation-error data for each symbol.

REFERENCES:
patent: 4689806 (1987-08-01), Von der Embre
patent: 4736390 (1988-04-01), Ward et al.
patent: 5142553 (1992-08-01), Rosenkrang
patent: 5416802 (1995-05-01), Ishii
patent: 5475709 (1995-12-01), Futagami et al.

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