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Synchronization pulse generator in spread spectrum communication system

  • US 4,860,307 A
  • Filed: 10/09/1987
  • Issued: 08/22/1989
  • Est. Priority Date: 10/14/1986
  • Status: Expired due to Fees
First Claim
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1. A synchronization pulse generator in a spectrum spread communication system comprising:

  • first and second envelope detectors for subjecting a correlation output of a spectrum spread signal to envelope detection, a time constant in the second envelope detector being larger than a time constant of the first envelope detector;

    threshold value generator means for generating a threshold value having a level corresponding to an output from the second envelope detector; and

    a comparator for comparing an output level of the first envelope detector with a threshold value generated by the threshold value generator means, and outputting an initial synchronization pulse.

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