Patents by Inventor Norman Secord

Norman Secord 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).

  • Synchronization channel with cyclic hierarchical sequences and method for cell site search with low detector complexity
    Patent number: 6731673
    Abstract: A CDMA system in which the base stations transmit a synchronization channel comprising a primary subchannel from which slot synchronization is determinate and a secondary subchannel containing a cyclic hierarchical code unique for each base station and for each slot in a frame. The cyclic code is derived from a first code unique to a base station and a different cyclic shift of a second code also unique to the base station in each slot of a frame. Mobile stations quickly and with low-complexity detectors determine slot synchronization from the primary subchannel and then determine base station identification and frame synchronization by correlating samples of signal received on the secondary subchannel with a set of first codes and cyclic shifts of corresponding second codes.
    Type: Grant
    Filed: February 15, 2000
    Date of Patent: May 4, 2004
    Assignee: Nortel Networks Limited
    Inventors: Anatoli V. Kotov, Farideh Khaleghi, Norman Secord
  • System and method to combine power control commands during soft handoff in DS/CDMA cellular systems
    Patent number: 6330456
    Abstract: Mobile stations in communication with several base stations in a cellular CDMA system (as when undergoing soft handoff) do not use the conventional “or of the downs” rule for assessing power control commands from base stations. Mobile stations assess the link quality of the links from the base station. If any base station displays link quality above a predetermined threshold and if that base station is requesting power reduction, power is reduced by a predetermined amount, delta. Otherwise, power is adjusted up or down by an amount less than or equal to delta according to the received power control signals from each base station in conjunction with a weight determined from the signal quality of the link from each base station.
    Type: Grant
    Filed: May 4, 2001
    Date of Patent: December 11, 2001
    Assignee: Nortel Networks Limited
    Inventors: Bassam Hashem, Norman Secord, Wookwon Lee
  • System and method to combine power control commands during soft handoff in DS/CDMA cellular systems
    Patent number: 6269239
    Abstract: Mobile stations in communication with several base stations in a cellular CDMA system (as when undergoing soft handoff) do not use the conventional “or of the downs” rule for assessing power control commands from base stations. Mobile stations assess the link quality of the links from the base station. If any base station displays link quality above a predetermined threshold and if that base station is requesting power reduction, power is reduced by a predetermined amount, delta. Otherwise, power is adjusted up or down by an amount less than or equal to delta according to the received power control signals from each base station in conjunction with a weight determined from the signal quality of the link from each base station.
    Type: Grant
    Filed: May 19, 1999
    Date of Patent: July 31, 2001
    Assignee: Nortel Networks Corporation
    Inventors: Bassam Hashem, Norman Secord, Wookwon Lee