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Iterative localization techniques

  • US 8,565,106 B2
  • Filed: 06/28/2010
  • Issued: 10/22/2013
  • Est. Priority Date: 06/28/2010
  • Status: Active Grant
First Claim
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1. A method for mobile station (MS) location estimation in the Worldwide Interoperability for Microwave Access (WiMAX) communication systems comprising the following steps:

  • a) WiMAX MS measurement of received signal strength of at least two base stations, where base station one is a serving base station (BS1);

    b) WiMAX MS measurement of a relative delay which denotes a propagation delay difference between the BS1 and a non-serving base station (BS2);

    c) Sending data corresponding to the WiMAX MS measurements to the location server;

    d) Calculation of an area of MS locations based on relative delay applying time difference of arrival method;

    e) Bounding the area of MS locations applying received signal strength value of the BS2 and its approximation of an antenna diagram using cosn approximation, antenna tilt and azimuth applying angle of arrival method;

    f) Estimation of an approximation of the MS location applying center of gravity calculation for the area of MS locations assuming uniform distribution of the weight over area;

    g) Calculation of a weight distribution for the area of MS locations based at least in part on radio signal from BS1;

    h) Estimation of a new approximation of MS location considering a previous approximation and a calculated center of gravity in step g;

    i) Calculation of a weight distribution for the area of MS locations based at least in part on radio signal from BS2;

    j) Estimation of a new approximation of MS location considering a previous approximation and a calculated center of gravity in step i;

    k) exiting from the iterative loop based at least in part on a predetermined criteria; and

    l) determining a new area of MS locations.

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