Automatic frequency control system and method for...

Details Automatic frequency control system and method for... Automatic frequency control system and method for...

H - Electricity

04

B

H04B 7/005 (2006.01) H04L 27/16 (2006.01)

Patent

CA 2051880

-32- ABSTRACT OF THE DISCLOSURE The present invention provides a system and method of automatic frequency control (AFC) in a frequency-shift-key (FSK) data transmission system that allows a receiver to be used that has a bandwidth that approaches the requisite minimum bandwidth for a given data transmission rate and produces a substantial signal noise ratio (SNR) in the detected signal by the receiver. The invention includes a transmitter that outputs a SPACE signal and a MARK signal in a preamble that precedes the transmission data. The apparatus also includes a receiver that uses the SPACE and MARK signals to adjust the frequency of the signal output by a voltage-controlled-oscillator (VCO) to tune the receiver and thereby improve the signal-to-noise ratio (SNR) in the signals subsequently detected by the receiver.

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