×

Phase detectors in carrier recovery for offset QAM and VSB

  • US 20040081257A1
  • Filed: 10/16/2003
  • Published: 04/29/2004
  • Est. Priority Date: 11/03/1998
  • Status: Active Grant
First Claim
Patent Images

1. In a receiver that recovers a digital VSB signal, a method for detecting the phase of the recovered digital signal comprising:

  • forming from the recovered digital signal a first data stream and a second data stream comprising a Hilbert Transform pair;

    generating a third data stream that represents tentative decisions from the first data stream;

    comparing the first and third data streams to generate a symbol error signal;

    combining the symbol error signal and the second data stream to form a phase error signal; and

    coupling the phase error signal to a VCO to reduce the phase error signal.

View all claims
  • 7 Assignments
Timeline View
Assignment View
    ×
    ×