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Apparatus and method for error detection and correction in radio frequency identification device

  • US 5,608,739 A
  • Filed: 09/08/1995
  • Issued: 03/04/1997
  • Est. Priority Date: 09/30/1993
  • Status: Expired due to Term
First Claim
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1. A radio frequency identification system comprising:

  • a source of an information signal having eight-bit blocks;

    (8, 13,

         4) block code encoder means responsive to the information signal for providing a linear systematic block coded signal comprising a coded block having eight information bits and five code bits for each of the eight-bit blocks;

    transmitter means responsive to the thirteen-bit linear systematic block coded signal for providing a transmitted signal;

    receiver means responsive to the transmitted signal for providing a signal comprising received coded blocks;

    (8, 13,

         4) linear systematic block code decoder means for decoding the received coded blocks to provide a decoded signal comprising one eight-bit decoded block for each of the received coded blocks, the eight-bit decoded blocks being generated each time there are less than two bit errors in a received coded block;

    means within the decoder for determining if there are exactly two bit errors in any of the received coded blocks;

    means within the decoder for correcting one bit error operable each time only one bit error occurs in any of the received coded blocks; and

    identifier means responsive to the eight-bit decoded blocks for providing a return identification signal.

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