Method for measurement and reduction of frequency offsets in distributed satellite/wireless networks and corresponding communications system
AssigneeComsat Corporation
InventorsAnil K. Agarwal, Charles Richard Thorne
Life of this patent
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Abstract
A method and device for measurement and reduction of frequency offset in a communication network having a master reference terminal and at least one terminal exchanging reference and control bursts includes steps for adjusting demodulator frequency in the terminal responsive to a first frequency error between a first nominal frequency value and a respective reference burst received by the terminal, and adjusting modulator frequency at the terminal responsive to a second frequency error between a second nominal frequency value and a control burst generated by the master reference terminal and transmitted to the terminal.
Claims29
A method for measurement and reduction of frequency offsets in a communications network including a master reference terminal and a terminal exchanging reference and control bursts, comprising steps for:
- adjusting demodulator frequency in the terminal responsive to a first frequency error between a first nominal frequency value and a respective reference burst received by the terminal;
- and
- adjusting modulator frequency at the terminal responsive to a second frequency error between a second nominal frequency value and a control burst generated by the terminal and transmitted to the master reference terminal.
A method for measurement and reduction of frequency offsets in a communications network including a master reference terminal and N terminals exchanging reference and control bursts via a satellite, where N>1, comprising steps for:
- adjusting demodulator frequency in the Nth terminal responsive to a first frequency error between a first nominal frequency value and a respective reference burst received by the Nth terminal;
- determining a second frequency error between a second nominal frequency value and a control burst, said second frequency error being generated by the master reference terminal;
- and
- adjusting modulator frequency at the Nth terminal responsive to said second frequency error.
A method for measurement and reduction of frequency offsets in a communications network including a master reference terminal, a second reference terminal, and N terminals exchanging reference and control bursts via a satellite, where N>1, comprising steps for:
- adjusting demodulator frequency in the Nth terminal responsive to a first frequency error between a first nominal frequency value and a respective reference burst received by the Nth terminals;
- determining a second frequency error between a second nominal frequency value and a control burst, said second frequency error being generated by one of the master reference terminal and the second reference terminal;
- and
- adjusting modulator frequency at the Nth terminal responsive to said second frequency error.
A communications network including a master reference terminal and a terminal exchanging reference and control bursts via a communications channel and having means for measuring and reducing frequency offsets in said terminal of the communications network, wherein a demodulator frequency of said terminal is determined based on a first frequency error between the reference burst and a nominal frequency value determined by said terminal and a modulator frequency of said terminal is established responsive to a second frequency error generated by said master reference terminal with respect to the control burst.
Dependencies are inferred from the claim text.