Patents by Inventor Lap Shing Chan

Lap Shing Chan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Carrier recovery circuit and lock detection circuit for mixed PSK signals
    Patent number: 7092458
    Abstract: A BPSK phase detection unit assumes that an input signal is a BPSK modulated signal in detecting a phase error of a recovered carrier and an 8PSK phase detection unit assumes that the input signal is an 8PSK modulated signal in detecting the phase error of the recovered carrier. An 8PSK frequency detection unit assumes that the input signal is an 8PSK modulated signal in detecting a frequency error of the recovered carrier. A selector selects the phase error detected by the BPSK phase detection unit or the phase error detected by the 8PSK phase detection unit. A carrier recovery unit recovers a carrier by adjusting a phase of the input signal, based on the selected phase error and the frequency error.
    Type: Grant
    Filed: March 23, 2001
    Date of Patent: August 15, 2006
    Assignee: Renesas Technology Corp.
    Inventors: Lap Shing Chan, Shuji Murakami
  • Carrier recovery circuit and lock detection circuit for mixed PSK signals
    Publication number: 20020071502
    Abstract: A BPSK phase detection unit assumes that an input signal is a BPSK modulated signal in detecting a phase error of a recovered carrier and an 8PSK phase detection unit assumes that the input signal is an 8PSK modulated signal in detecting the phase error of the recovered carrier. An 8PSK frequency detection unit assumes that the input signal is an 8PSK modulated signal in detecting a frequency error of the recovered carrier. A selector selects the phase error detected by the BPSK phase detection unit or the phase error detected by the 8PSK phase detection unit. A carrier recovery unit recovers a carrier by adjusting a phase of the input signal, based on the selected phase error and the frequency error.
    Type: Application
    Filed: March 23, 2001
    Publication date: June 13, 2002
    Inventors: Lap Shing Chan, Shuji Murakami