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Timing synchronization for M-DPSK channels

  • US 6,973,142 B2
  • Filed: 03/19/2003
  • Issued: 12/06/2005
  • Est. Priority Date: 03/19/2003
  • Status: Active Grant
First Claim
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1. A differential phase shift signal receiver comprising:

  • a demodulator comprising a first input to receive a differential phase shift signal, and an output to provide a differential phase shift base-band signal;

    an analog to digital sampling module comprising an input coupled to the output of the demodulator, and an output to provide a sampled differential phase shift base-band signal; and

    a synchronization detection module comprising;

    an input coupled to the output of the analog to digital sampling module;

    a first output to provide a symbol center sample index that identifies a sample of the sampled differential phase shift base-band signal having a predefined relationship to a center of a received symbol;

    a second output to provide a sample interval fraction that identifies a fractional portion of a sample period from the sample identified by the symbol center sample index to an estimated center of the received symbol;

    a phase differential detection module to receive the sampled differential phase shift base-band signal and to produce a sequence of phase differential samples;

    a signal correlation module responsive to the phase differential detection module, the signal correlation module including a sample correlation module, the sample correlation module having a first input to receive the sequence of phase differential samples and a second input to receive a predetermined synchronization symbol pattern, pattern associated with predetermined synchronization bit pattern, the sample correlation module to produce symbol correlation values; and

    a timing detection module responsive to the signal correlation module to generate the symbol center sample index and the sample interval fraction.

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