A method for receiving spectrum spreading signals using a Doppler-effect frequency-shift correction generates a corrective signal based on an estimation of a modulation period related to the Doppler effect detected in a preamble portion of a received signal. The corrective signal is used for correcting an information portion of the received signal. Base band digital signals are operated upon by using the DOT and CROSS components.

 
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< Voltage controlled oscillator (VCO) suitable for use in frequency shift keying (FSK) system

> Method for receiving spectrum spreading signals with frequency shift correction

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