Relatively simple QPSK demodulator, that uses substantially all

Details Relatively simple QPSK demodulator, that uses substantially all Relatively simple QPSK demodulator, that uses substantially all

1993-06-24

1994-10-11

Mis, David

Demodulators

Phase shift keying or quadrature amplitude demodulator

375 82, 375 83, H03D 300, H03D 318

Patent

active

053550927

ABSTRACT:
Apparatus for demodulating an incoming digitally phase modulated analog signal to reproduce symbol data carried by the signal. Specifically, the demodulator relies on first counting, on a free-running and modulo basis, pulses of a fixed-frequency reference clock signal to form a counted value. The incoming signal is converted to a one-bit phase modulated digital signal. At the occurrence of a pre-defined point in the one-bit phase modulated signal, typically a rising edge occurring at the symbol rate, the counted value is stored as phase information. Within each symbol period, a difference between current and immediately prior counted values, i.e. the latter being a current value but delayed by one symbol period, is determined. This difference, i.e. phase change data, is subsequently sampled and decoded to yield reproduced symbol data, as well as, used, through a phase locked loop, to generate a data clock and the symbol clock.

REFERENCES:
patent: 5097220 (1992-03-01), Shimakata

Affiliated with

Also associated with

Rating

Relatively simple QPSK demodulator, that uses substantially all does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Relatively simple QPSK demodulator, that uses substantially all , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Relatively simple QPSK demodulator, that uses substantially all will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1661615