Method and system for determining the location of an electronic device using multi-tone frequency signals
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United States of America Patent
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Apr 16, 2013
Grant Date -
Feb 24, 2011
app pub date -
Jul 26, 2010
filing date -
Mar 31, 2008
priority date (Note) -
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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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