Method for the frequency correction of an oscillator of a sensor node of a wireless sensor network
AssigneesFraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Friedrich-Alexander-Universität Erlangen-Nürnberg
InventorsHans-Martin Tröger, Norbert Franke, Albert Heuberger, Jörg Robert
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Abstract
The invention relates to a method for the frequency error correction of an oscillator of a sensor node in a sensor network, comprising the following steps: receiving a transmission signal of a transmitter, the signal being modulated by orthogonal frequency division multiplexing (OFDM); determining the frequency deviation of the oscillator using the received transmission signal; determining a correction signal for correcting the frequency deviation of the oscillator and correcting the frequency of the oscillator by means of the correction signal.
Claims14
A method for correcting a frequency of an oscillator of a sensor node of a sensor network, the method comprising:
- receiving a transmission signal of each of a plurality of transmitters with a modulation according to orthogonal frequency-division multiplexing (OFDM);
- determining the frequency deviation of the oscillator based on the received transmission signal;
- determining a correction signal for the correction of the frequency deviation of the oscillator;
- and
- correcting the frequency of the oscillator with the correction signal.
A method for correcting a frequency of an oscillator of a sensor node of a sensor network, the method comprising:
- receiving a transmission signal of a transmitter with a modulation according to orthogonal frequency-division multiplexing (OFDM);
- determining the frequency deviation of the oscillator based on the received transmission signal;
- determining a correction signal for the correction of the frequency deviation of the oscillator;
- and
- correcting the frequency of the oscillator with the correction signal,
- wherein:
- after receiving the transmission signal, the channel impulse response of the transmission channel is determined from the received transmission signal;
- the signals of different transmission paths of the received transmission signal are determined from the channel impulse response;
- and
- the frequency deviation of the oscillator is determined based on the signal of a transmission path.
A method for correcting a frequency of an oscillator of a sensor node of a sensor network, the method comprising:
- receiving a transmission signal of a transmitter with a modulation according to orthogonal frequency-division multiplexing (OFDM);
- determining the frequency deviation of the oscillator based on the received transmission signal;
- determining a correction signal for the correction of the frequency deviation of the oscillator;
- and
- correcting the frequency of the oscillator with the correction signal,
- wherein the sensor node is communicatively connected to one or more further sensor nodes and transfers information on the receiving transmitter to one or more further sensor nodes.
A method for correcting a frequency of an oscillator of a sensor node of a sensor network, the method comprising:
- receiving a transmission signal of a transmitter with a modulation according to orthogonal frequency-division multiplexing (OFDM);
- determining the frequency deviation of the oscillator based on the received transmission signal;
- determining a correction signal for the correction of the frequency deviation of the oscillator;
- and
- correcting the frequency of the oscillator with the correction signal,
- wherein the received transmission signal comprises time information and the oscillator is time-synchronised based on the time information.
Dependencies are inferred from the claim text.