METHODS AND SYSTEMS FOR DETERMINING THE LOCATION OF AN ELECTRONIC DEVICE
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Abstract
Embodiments of the present invention include a method of determining a location of a mobile device. The method comprises transmitting a signal between a plurality of known locations and receiving signal at device of unknown location such as a mobile device. The signal may include multiple tones having different frequencies and resulting in sets of residual phase differences. The location of the mobile device may be determined using the known locations and the frequency and phase differences between the transmitted tones. In one embodiment, OFDM signals may be used between an access point and mobile device, for example, to determine the location of the mobile device.
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Citations
24 Claims
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1-19. -19. (canceled)
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20. A method of determining a location of an electronic device, the method comprising:
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determining a first distance between a first electronic device having an unknown location and a second electronic device having a known location, determining the first distance comprising; generating a plurality of tones having a plurality of frequencies; modulating the tones with a carrier frequency to produce a first signal; transmitting the first signal between the first electronic device and the second electronic device; receiving the first signal; demodulating the first signal to extract the plurality of tones; extracting the phase of at least a portion of the plurality of tones; and determining phase differences between tones at different frequencies, each phase difference having a corresponding frequency difference; determining a second distance between the first electronic device having the unknown location and a third electronic device having a known location, determining the second distance comprising the same method as determining the first distance; determining a third distance between the first electronic device having the unknown location and a fourth electronic device having a known location, determining the third distance comprising the same method as determining the first distance; and calculating the first, second, and third distances based on the phase differences and corresponding frequency differences; and determining the location of said first electronic device based on said first, second, and third distances.
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21-22. -22. (canceled)
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23. A method of determining a location of an electronic device, the method comprising:
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transmitting three or more signals between a first electronic device at an unknown location and a second electronic device at a known location, the second electronic device comprising at least three antenna, wherein the three or more signals each include a plurality of tones having different frequencies; determining at least one first phase difference between at least two tones having a first frequency difference in the three or more signals accumulated during transmission between the first electronic device and a first antenna of the second electronic device; determining at least one second phase difference between at least two tones having a second frequency difference in the three or more signals accumulated during transmission between the first electronic device and a second antenna of the second electronic device; determining at least one third phase difference between at least two tones having a third frequency difference in the three or more signals accumulated during transmission between the first electronic device and a third antenna of the second electronic device; and determining the location of the first electronic device using said first, second, and third phase differences and said first, second, and third frequency differences. - View Dependent Claims (24)
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Specification