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Time division duplex system utilizing global positioning system timing signals for access point synchronization

  • US 20030048758A1
  • Filed: 09/07/2001
  • Published: 03/13/2003
  • Est. Priority Date: 09/07/2001
  • Status: Active Grant
First Claim
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1. In a Time Division Duplex (TDD) system, an apparatus for temporally aligning Access Points (APEs) and Customer Premises Equipment (CPE) in the system, said apparatus comprising:

  • a Global Positioning System (GPS) receiver adapted to receive GPS timing signals;

    an APE local oscillator;

    a timing generator having a dead time counter, said timing generator coupled to said local oscillator and adapted to generate a System Timing signal;

    a phase error detector adapted to compare said GPS timing signals with a symbol clock signal derived from said System Timing signal; and

    a synchronization state machine coupled to said phase error detector adapted to generate synchronization information in response to the output of said phase error detector, said synchronization information adapted to adjust said APE local oscillator frequency via said dead time counter.

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