Pulse or digital communications – Repeaters – Testing
Patent
1990-09-24
1993-05-04
Kuntz, Curtis
Pulse or digital communications
Repeaters
Testing
375 97, 329307, 332100, 455 71, H04L 2706, H04L 2710
Patent
active
052088359
ABSTRACT:
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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Eisenhauer Edward R.
Weeks Richard W.
Bocure Tesfaldet
In-Situ, Inc.
Kuntz Curtis
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