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Methods and apparatus for a spread spectrum modulated backscatter electronic shelf label system

  • US 7,095,794 B2
  • Filed: 10/23/2001
  • Issued: 08/22/2006
  • Est. Priority Date: 10/23/2001
  • Status: Expired due to Term
First Claim
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1. An electronic price label (ESL) system comprising:

  • an ESL receiving a message transmitted from a communications base station (CBS), the ESL including a transmitter having a generator for producing a pseudo-random code sequence, the transmitter transmitting a response to the message by reflectively modulating a continuous wave (CW) signal with the pseudo-random code sequence so as to impose the pseudo-random code sequence on the continuous wave signal; and

    the CBS receiving and correlating the reflectively modulated CW signal.

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