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Method for the control of receiver synchronization in a mobile phone

  • US 5,276,691 A
  • Filed: 01/21/1992
  • Issued: 01/04/1994
  • Est. Priority Date: 01/21/1992
  • Status: Expired due to Fees
First Claim
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1. A method for determining the cause of an incorrect synchronization word pattern in a received mobile telephone signal having a succession of frames, comprising the steps of:

  • (1) receiving binary data frames having a synchronization pattern;

    (2) a first step of comparing bit-by-bit the received synchronization pattern with a predetermined synchronization pattern;

    (3) accepting the received synchronization pattern as correct if the first step of comparing determines no more than two bits of the received synchronization pattern differ from the predetermined synchronization pattern;

    (4) if the first step of comparing determines that the received synchronization pattern is not accepted, a second step of comparing bit-by-bit the received synchronization pattern with a phase shifted version of the predetermined synchronization pattern; and

    (5) accepting the required synchronization pattern as correct, but out of synchronization, if the second step of comparing determines no more than two bits of the received synchronization pattern differs from the phase shifted version of the predetermined synchronizing pattern, otherwise indicating a loss of received synchronization and not accepting the synchronization pattern as correct.

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