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1. (WO2015179154) AMÉLIORATION DE LA PRÉCISION DU TEMPS DE PROPAGATION ALLER-RETOUR DANS DIVERS ENVIRONNEMENTS DE CANAL
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CLAIMS

What is claimed is:

1. A method for wireless ranging, comprising:

receiving a signal comprising a frame from a transmitter;

identifying a first value for the frame; and

identifying a plurality of first arrival correction (FAC) values for the frame, each FAC value exceeding a threshold, wherein the plurality of FAC values precede the identified first value within the frame.

2. The method of claim 1 , wherein the threshold is based at least in part on a noise power.

3. The method of claim 1 , wherein the plurality of FAC values comprise a plurality of searched FAC values which each exceed the threshold, wherein the plurality of searched FAC values each occur within a search window.

4. The method of claim 1, further comprising:

determining a mean FAC value, wherein the mean FAC value is based at least in part on the plurality of FAC values.

5. The method of claim 4, wherein the plurality of FAC values are weighted proportional to a power of each FAC value.

6. The method of claim 4, wherein the plurality of FAC values are weighted inversely proportional to a power of each FAC value.

7. The method of claim 4, further comprising:

determining a range to the transmitter based at least in part on the mean FAC value.

8. The method of claim 1, wherein identifying the plurality of FAC values which each exceed the threshold comprises:

determining an appropriate threshold, wherein the appropriate threshold is one of a plurality of thresholds; and

identifying the plurality of first arrival correction (FAC) values which each exceed the appropriate threshold.

9. The method of claim 8, wherein at least one of the plurality of thresholds is based at least in part on a noise power.

10. The method of claim 8, wherein at least one of the plurality of thresholds is based at least in part on the first value for the frame.

11. The method of claim 8, wherein determining an appropriate threshold is based at least in part on at least one of a signal to noise ratio and a visibility environment.

12. The method of claim 1, wherein the first value for the frame comprises a maximum value for the frame.

13. The method of claim 1, wherein the frame comprises a time of departure (TOD) and a time of arrival (TO A).

14. The method of claim 13, further comprising:

adjusting the TOA based at least in part on the plurality of FAC values.

15. The method of claim 14, further comprising:

determining a range to the transmitter based at least in part on the TOD and the adjusted TOA.

16. The method of claim 1, wherein the frame comprises at least one of a probe and a response indicating receipt of a probe.

17. An apparatus for wireless ranging, comprising:

a receiver configured for receiving, from a transmitter, a signal comprising a frame;

a path identifier configured for identifying a first value for the frame; and a corrector configured for identifying a plurality of first arrival correction (FAC) values for the frame, each FAC value exceeding a threshold, wherein the plurality of FAC values precede the identified first value within the frame.

18. The apparatus of claim 17, wherein the threshold is based at least in part on a noise power.

19. The apparatus of claim 17, wherein the plurality of FAC values comprise a plurality of searched FAC values which each exceed the threshold, wherein the plurality of searched FAC values each occur within a search window.

20. The apparatus of claim 17, further comprising:

a combiner configured for determining a mean FAC value, wherein the mean FAC value is based at least in part on the plurality of FAC values.

21. The apparatus of claim 20, wherein the plurality of FAC values are weighted proportional to a power of each FAC value.

22. The apparatus of claim 20, wherein the plurality of FAC values are weighted inversely proportional to a power of each FAC value.

23. The apparatus of claim 20, further comprising:

a ranger configured for determining a range to the transmitter based at least in part on the mean FAC value.

24. The apparatus of claim 17, wherein identifying the plurality of FAC values which each exceed the threshold comprises:

determining an appropriate threshold, wherein the appropriate threshold is one of a plurality of thresholds; and

identifying the plurality of first arrival correction (FAC) values which each exceed the appropriate threshold.

25. The apparatus of claim 24, wherein at least one of the plurality of thresholds is based at least in part on at least one of a noise power and the first value for the frame.

26. The apparatus of claim 24, wherein determining an appropriate threshold is based at least in part on at least one of a signal to noise ratio and a visibility environment.

27. The apparatus of claim 17, wherein the frame comprises a time of departure (TOD) and a time of arrival (TO A).

28. The apparatus of claim 27, further comprising:

an adjuster configured for adjusting the TOA based at least in part on the plurality of FAC values; and

a ranger configured for determining a range to the transmitter based at least in part on the TOD and the adjusted TOA.

29. An apparatus for wireless ranging, comprising:

means for receiving, from a transmitter, a signal comprising a frame;

means for identifying a first value for the frame; and

means for identifying a plurality of first arrival correction (FAC) values for the frame, each FAC value exceeding a threshold, wherein the plurality of FAC values precede the identified first value within the frame.

30. A non-transitory computer-readable medium storing instructions executable by a processor to:

receive, from a transmitter, a signal comprising a frame;

identify a first value for the frame; and

identify a plurality of first arrival correction (FAC) values for the frame, each FAC value exceeding a threshold, wherein the plurality of FAC values precede the identified first value within the frame.