Method and apparatus for demodulation of relative phase modulate

Details Method and apparatus for demodulation of relative phase modulate Method and apparatus for demodulation of relative phase modulate

1975-08-13

1977-02-08

Safourek, Benedict V.

Telegraphy

Code transmitters

Rotary contact

325345, 325 65, 325324, 325476, 178 67, H04L 1524

Patent

active

040073300

ABSTRACT:
A phase modulated carrier wave, in which a phase reversal represents one of two binary values is demodulated by sampling at a rate f.sub.s greater than the frequency of the carrier, comparing the phase of each sample with a sample delayed a nominal bit period in one channel, a sample delayed less than the nominal bit period in a second channel, and a sample delayed more than the nominal bit period in a third channel to compensate for positive and negative Doppler shift of the carrier from its nominal frequency in the second and third channels, respectively. A code word is detected in each of the three channels by comparing each demodulated sample bit with a replica of the code word, and correlating the results separately for each channel. The channel with the highest correlation is selected as the one most closely tuned to the carrier frequency received.

REFERENCES:
patent: 3335224 (1967-08-01), Meslener
patent: 3656064 (1972-04-01), Giles et al.
patent: 3729684 (1973-04-01), Shuda
patent: 3868579 (1975-02-01), Dilley

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