Synchronization pulse generator in spread spectrum communication system
AssigneeKabushiki Kaisha Kenwood
InventorShigeyuki Nakayama
Life of this patent
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Abstract
A synchronization pulse generator in a spectrum spread communication system includes first and second envelope detectors for subjecting a correlation output of a spectrum spread signal to envelope detection; a threshold value generator 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, and outputting an initial synchronization pulse.
Claims3
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.
Dependencies are inferred from the claim text.