Pseudo-spectrum averaging for high accuracy distance measurements
AssigneeSilicon Laboratories Inc.
InventorSauli Lehtimaki
Life of this patent
Estimating the term…
Abstract
A system and method for determining the distance between two wireless network devices is disclosed. The present system utilizes a plurality of pseudo-spectrums to create a more accurate final pseudo-spectrum. The pseudo-spectrums are graphs, where peaks in the graphs are indicative of the magnitude of the signal received at a certain distance. In some embodiments, the pseudo-spectrums are generated using the MUSIC algorithm. The final pseudo-spectrum is generated by performing a mathematical operation on corresponding elements in each pseudo-spectrum. This mathematical operation may include multiplication and normalization. The final pseudo-spectrum provides a more accurate indication of the distance between the devices than can otherwise be achieved.
Claims20
A method of improving accuracy of a distance measurement between two wireless network devices, comprising:
- performing a channel sound procedure using the two wireless network devices a plurality of times so as to acquire a plurality of measurements, the plurality of measurements indicative of a channel transfer function;
- executing a MUSIC algorithm for each of the plurality of measurements to create a plurality of pseudo-spectrums, wherein each of the plurality of pseudo-spectrums comprises a graph that indicates magnitude as a function of distance;
- performing a mathematical operation on the plurality of pseudo-spectrums to produce a final pseudo-spectrum;
- and
- determining a distance between the two wireless network devices based on the final pseudo-spectrum.
A method of improving accuracy of a distance measurement between two wireless network devices, comprising:
- a. performing a channel sound procedure using the two wireless network devices so as to acquire an initial measurement, the initial measurement indicative of a channel transfer function;
- b. executing a MUSIC algorithm using the initial measurement to create a first pseudo-spectrum, wherein the first pseudo-spectrum comprises a graph that includes a plurality of grid positions that represent distance values and a magnitude associated with each of the distance values;
- c. assigning a weight to the magnitude for each distance value in the first pseudo-spectrum;
- d. multiplying the weight and the magnitude for each distance value to generate a final pseudo-spectrum;
- e. performing a channel sound procedure using the two wireless network devices so as to acquire a subsequent measurement, the subsequent measurement indicative of a channel transfer function;
- f. executing a MUSIC algorithm using the subsequent measurement to create a subsequent pseudo-spectrum;
- g. assigning a weight to the magnitude for each distance value in the subsequent pseudo-spectrum;
- h. multiplying the weight and the magnitude for each distance value in the subsequent pseudo-spectrum with a corresponding value in the final pseudo-spectrum and using a product of the multiplying as a new value in the final pseudo-spectrum;
- and
- i. determining a distance between the two wireless network devices based on the final pseudo-spectrum.
Dependencies are inferred from the claim text.