Demodulation system for phase shift keyed modulated data transmi

Details Demodulation system for phase shift keyed modulated data transmi Demodulation system for phase shift keyed modulated data transmi

1990-12-26

1993-01-26

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

329306, 375 81, 375 82, H04L 2722

Patent

active

051827603

ABSTRACT:
A phase shift keyed telemetry system is disclosed, which is particularly adapted to demodulation of phase shift keyed signals where the medium of transmission is non-ideal, such that transitional cycles are present at each change of phase of the transmitted data. Demodulation is accomplished by comparison of the input signal to a reference signal generated from the input signal itself. The reference signal is generated by frequency dividing the input signal, preferably after full wave rectifying, by a multiple which is larger than the number of transitional cycles expected; the frequency divided signal is then multiplied in frequency to substantially match the frequency of the input signal. The use of the divider and multiplier removes the effects of transitional cycles of varying phase in generating the reference signal. A phase locked loop in the reference signal generating circuit also reduces the effects of frequency and phase shifting during the transitional cycles, as well as providing tolerance for missing cycles due to system noise.

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Lancaster, "Hardware Hacker", Radio-Electronics, (Mar. 1990), pp. 58-61, 66-68 and 78.

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