Patents by Inventor William H. Warner

William H. Warner 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).

  • Methods and apparatus for use in obtaining frequency synchronization in an OFDM communication system
    Patent number: 6700866
    Abstract: An iterative method involves performing a coarse frequency correction process which adjusts receiver frequency so that a pilot tone signal is within a predetermined frequency range and, after performing the coarse frequency correction process, performing a fine frequency correction process which adjusts receiver frequency so that the pilot tone signal is substantially aligned with a pilot tone reference within the predetermined frequency range. By performing these processes, the receiver frequency may be adjusted so that the alias pilot tone signal is substantially aligned with the pilot tone reference and the pilot tone signal is undesirably shifted outside the predetermined frequency range. To eliminate this condition, the method further involves performing the coarse frequency correction process again and, after performing the coarse frequency correction process again, performing the fine frequency correction process again.
    Type: Grant
    Filed: June 14, 2000
    Date of Patent: March 2, 2004
    Assignee: AT&T Wireless Services, Inc.
    Inventors: Jari M. Heinonen, Michael R. Hirano, Steven E. McMeekin, Reijo Savola, William H. Warner