Demodulation of digital phase modulated signal

Details Demodulation of digital phase modulated signal Demodulation of digital phase modulated signal

1993-11-12

1996-12-17

Pascal, Robert

Demodulators

Phase shift keying or quadrature amplitude demodulator

375329, 375330, 375281, 375283, H04L 2718

Patent

active

055857612

ABSTRACT:
A method is disclosed of demodulating a signal (20) modulated by differential quadrature phase shift keying so that two bits of information are coded into each symbol period. The method comprises using a high frequency clock to determine the time taken (t.sub.1, t.sub.2, t.sub.3, t.sub.4), for the modulated signal to execute a predetermined number of cycles, such as 21, in the symbol period (T) and comparing the time thereby determined with the time (t.sub.o) of execution of the predetermined number of cycles for an unmodulated signal.

REFERENCES:
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patent: 3818346 (1974-06-01), Fletcher et al.
patent: 3843931 (1974-10-01), Sarkilahti
patent: 4414675 (1983-11-01), Comroe
patent: 4634990 (1987-01-01), Tate et al.
patent: 4879728 (1989-11-01), Tarallo
patent: 5122758 (1992-06-01), Tomita
patent: 5367538 (1994-11-01), La Rosa et al.

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