H - Electricity – 04 – L
Patent
H - Electricity
04
L
340/205
H04L 7/00 (2006.01) H04L 7/02 (2006.01) H04L 7/027 (2006.01) H04L 27/38 (2006.01)
Patent
CA 1329424
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 uTI. The two complex signals are also linked together with a second linkage circuit to form a second control signal uTR, wherein the two control signals can be interpretated as the real and imaginary components of a complex control signal uT=uTR+juTI. 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 ?=arc tan ?TI/?TR, where ?is the phase error in the clock pulse relative to the received signal.
560887
Alberty Thomas
Hespelt Volker
Ant Nachrichtentechnik G.m.b.h.
Fetherstonhaugh & Co.
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