Patents by Inventor Norman Morrison

Norman Morrison 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).

  • System and method for estimating round-trip time in telecommunication networks
    Patent number: 8873416
    Abstract: A method for estimating round-trip time (RTT) values for data packets travelling in a telecommunication network is disclosed. During a first time interval (206) which begins with the start of a data transmission, estimated RTT values (14) are generated by filtering a periodic sequence of RTT samples (12) with a self-initializing expanding memory polynomial (EMP) filter (16) and, after a first switch-over time at the end of the first time interval, the estimated RTT values are generated by filtering the RTT samples with a fading memory polynomial (FMP) filter (18). The first switch-over time is determined by comparing an FMP estimation error and an EMP estimation error, where the FMP estimation error is the difference between an output of the FMP filter and the RTT samples, and the EMP estimation error is the difference between an output of the EMP filter and the RTT samples, and triggering the first switch-over time when the FMP estimation error becomes equal to or less than the EMP estimation error.
    Type: Grant
    Filed: February 25, 2011
    Date of Patent: October 28, 2014
    Assignee: University of Cape Town
    Inventors: Guy-Alain Lusilao-Zodi, Norman Morrison
  • SYSTEM AND METHOD FOR ESTIMATING ROUND-TRIP TIME IN TELECOMMUNCATION NETWORKS
    Publication number: 20120307675
    Abstract: A method for estimating round-trip time (RTT) values for data packets travelling in a telecommunication network is disclosed. During a first time interval (206) which begins with the start of a data transmission, estimated RTT values (14) are generated by filtering a periodic sequence of RTT samples (12) with a self-initialising expanding memory polynomial (EMP) filter (16) and, after a first switch-over time at the end of the first time interval, the estimated RTT values are generated by filtering the RTT samples with a fading memory polynomial (FMP) filter (18). The first switch-over time is determined by comparing an FMP estimation error and an EMP estimation error, where the FMP estimation error is the difference between an output of the FMP filter and the RTT samples, and the EMP estimation error is the difference between an output of the EMP filter and the RTT samples, and triggering the first switch-over time when the FMP estimation error becomes equal to or less than the EMP estimation error.
    Type: Application
    Filed: February 25, 2011
    Publication date: December 6, 2012
    Applicant: UNIVERSITY OF CAPE TOWN
    Inventors: Guy-Alain Lusilao-Zodi, Norman Morrison