Patents by Inventor Lianfu Liu

Lianfu Liu 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 synchronization method, circuit, and system
    Patent number: 9774412
    Abstract: Embodiments of the present invention provide a carrier synchronization method, circuit, and system. The method includes performing n times frequency multiplication on a received signal; performing narrowband filtering at least twice and rectangular wave shaping at least twice on the signal obtained after the n times frequency multiplication; and performing n times frequency division on the signal obtained after the filtering and shaping, to restore a carrier signal. The variable n is a positive integer greater than or equal to 4.
    Type: Grant
    Filed: February 25, 2014
    Date of Patent: September 26, 2017
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Lianfu Liu, Jun Ma
  • Carrier Synchronization Method, Circuit, and System
    Publication number: 20140177489
    Abstract: Embodiments of the present invention provide a carrier synchronization method, circuit, and system. The method includes performing n times frequency multiplication on a received signal; performing narrowband filtering at least twice and rectangular wave shaping at least twice on the signal obtained after the n times frequency multiplication; and performing n times frequency division on the signal obtained after the filtering and shaping, to restore a carrier signal. The variable n is a positive integer greater than or equal to 4.
    Type: Application
    Filed: February 25, 2014
    Publication date: June 26, 2014
    Applicant: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Lianfu Liu, Jun Ma