Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1989-09-11
1992-10-20
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
375 94, H04L 700, H04L 2706
Patent
active
051576988
ABSTRACT:
A method of synchronizing clock pulses of a clock pulse generator used in a receiver of digital data transmissions. The received signal is demodulated by multiplying it in quadrature by an output signal of a carrier oscillator to obtain demodulated in-phase and quadrature components. The demodulated components are lowpass filtered to suppress harmonics of the carrier frequency and then bandpass filtered into two complex signals. The two complex signals are then linked together with a first linkage circuit to form a first control signal u.sub.TI. The two complex signals are also linked together with a second linkage circuit to form a second control u.sub.TR, wherein the two control signals can be interpretated as the real and imaginary components of a complex control signal u.sub.T =u.sub.TR +ju.sub.TI. The two components are separately averaged and then evaluated to form an actuation signal having an actuation value .delta. representing an error in the timing of the error pulse generator relative to the received signal. The evaluation is based on the relationship .phi.=arc tan u.sub.TI /u.sub.TR, where .phi. is the phase error in the clock pulse relative to the received signal.
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Alberty Thomas
Hespelt Volker
ANT Nachrichtentechnik GmbH
Bocure Tesfaldet
Safourek Benedict V.
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