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System and method for securing short-distance wireless communications, and applications thereof

  • US 7,020,474 B2
  • Filed: 06/24/2004
  • Issued: 03/28/2006
  • Est. Priority Date: 06/25/2003
  • Status: Expired due to Term
First Claim
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1. A system for short-distance wireless communications within a communication space, comprising:

  • a first wireless communication device having a locator; and

    a second wireless communication device that communicates with the first wireless communication device,wherein the locator of the first wireless communication device analyzes first signals received via a plurality of radio frequency paths from the second wireless communication device to determine a spatial location within the communication space for the second wireless communication device, andwherein the first wireless communication device transmits a key by second signals that arrive via a plurality of radio frequency paths substantially in-phase at the spatial location determined by the locator and substantially out-of-phase at other locations within the communication space, thereby allowing the key to be received by the second wireless communication device.

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