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Method and apparatus for signal processing in RFID receivers

  • US 20070177694A1
  • Filed: 01/17/2006
  • Published: 08/02/2007
  • Est. Priority Date: 01/17/2006
  • Status: Abandoned Application
First Claim
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1. A method for decoding an encoded data signal, comprising:

  • (a) receiving the encoded data signal including a plurality of data symbols, wherein a time period T is a length of a data symbol of the encoded data signal, wherein a current data symbol begins at time t and ends at time (t+T);

    (b) correlating an in-phase component of the received signal with a reference signal over a period t−

    T/2 to t+T/2 to generate a first in-phase correlation coefficient for the current data symbol;

    (c) correlating an in-phase component of the received signal with a reference signal over a period t+T/2 to t+3T/2 to generate a second in-phase correlation coefficient for the current data symbol;

    (d) correlating a quadrature component of the received signal with the reference signal over a period t−

    T/2 to t+T/2 to generate a first quadrature correlation coefficient for the current data symbol;

    (e) correlating a quadrature component of the received signal with the reference signal over a period t+T/2 to t+3T/2 to generate a second quadrature correlation coefficient for the current data symbol;

    (f) multiplying the first in-phase correlation coefficient with the second in-phase correlation coefficient to produce an in-phase cross-correlation value;

    (g) multiplying the first quadrature correlation coefficient with the second quadrature correlation coefficient to produce a quadrature cross-correlation value;

    (h) adding the in-phase cross-correlation value and the quadrature cross-correlation value to produce an integral cross correlation value; and

    (i) determining a decoded value for the current data symbol based on the integral cross-correlation value.

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