Frequency error detecting device capable of correctly detecting

Details Frequency error detecting device capable of correctly detecting Frequency error detecting device capable of correctly detecting

1993-11-24

1996-07-02

Chin, Stephen

Pulse or digital communications

Receivers

Automatic frequency control

H04L 2706

Patent

active

055330681

ABSTRACT:
Supplied with a transmitted signal defined by a sequence signal vectors each of which has a phase variation equal to a predetermined phase variation. A demodulator (11) quadrature demodulates a transmitted signal into a demodulated signal with reference to a standard signal of a standard frequency. The demodulated signal is defined by a sequence of demodulated vectors. An A/D section (21, 22) samples the demodulated vectors at a predetermined sampling rate to quantize the demodulated vectors into quantized vectors. A signal processor (31) compounds a composite vector from the quantized vectors within a predetermined number of the quantized vectors. The signal processor calculates a phase difference between the composite vector and a predetermined vector to detect a frequency error between the standard frequency and a carrier frequency of the transmitted signal.

REFERENCES:
patent: 5001727 (1991-03-01), McDavid
patent: 5062123 (1991-10-01), Geile et al.

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