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REFLECTIVE COMMUNICATION USING RADIO-FREQUENCY DEVICES

  • US 20080043820A1
  • Filed: 09/14/2007
  • Published: 02/21/2008
  • Est. Priority Date: 06/04/2002
  • Status: Active Grant
First Claim
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1. A reflective communication system, comprising:

  • a plurality of transmitters that operate on the same frequency wherein each of said plurality of transmitters is adapted to transmit communication signals having different spread spectrum codes;

    a plurality of wireless communication devices located in the transmission field of said plurality of transmitters that receive said communication signals from said plurality of transmitters wherein said plurality of wireless communication devices reflectively modulate said communication signals with data signals having a second modulation to form reflected data signals; and

    a receiver adapted to receive said reflected data signals from said plurality of wireless communication devices and determine said spread spectrum codes in said reflected data signals in order to determine which of said plurality of transmitters originated said communication signals reflected by said plurality of wireless communications device to determine the approximate location of said wireless communication devices.

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