High-speed point-to-point modem-less microwave radio frequency link using direct frequency modulation
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United States of America Patent
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Nov 23, 2004
Grant Date -
Aug 15, 2002
app pub date -
Feb 14, 2001
filing date -
Feb 14, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A point-to-point microwave radio link that operates in a Frequency Division Duplex (FDD) mode using direct digital modulation with a Continuous Phase-Frequency Shift Keyed (CP-FSK) scheme. The transmit signal is generated by a circuit that uses a Voltage-Control Oscillator (VCO) operating in a microwave radio band. The VCO is deviated over a narrow frequency range that is reduced by a predetermined factor. The output of the VCO is then frequency multiplied by the predetermined factor to produce the modulated microwave output signal at the desired band. The deviation frequency of the VCO is thus chosen to be the reciprocal of the multiplication factor times the transport bit rate.
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