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    71.
    发明专利
    未知

    公开(公告)号：AT328403T

    公开(公告)日：2006-06-15

    申请号：AT03713825

    申请日：2003-02-27

    Applicant: QUALCOMM INC

    Inventor： TEAGUE EDWARD HARRISON ,  AMERGA MESSAY ,  LIN JEREMY ,  SHIU DA-SHAN

    IPC: H04B1/00 ,  H04B1/707

    Abstract: Techniques for tracking closely spaced multipath and preventing finger merge without monitoring relative positions between each of a plurality of fingers are disclosed. In one aspect, motion limits are determined for each finger. Time-tracking commands that would move the position of a finger outside its respective motion limits are suppressed. In another aspect, motion limits are updated dynamically, the motion limits of each finger determined in accordance with the motion limits of fingers adjacent to it. Various other aspects are also presented. These aspects have the benefit of preventing finger merge, which allows the allocation of multiple fingers to closely spaced multipath, thus increasing performance and system capacity, and mitigating misallocation of system resources.

    72.
    发明专利
    未知

    公开(公告)号：BR0309162A

    公开(公告)日：2005-04-26

    申请号：BR0309162

    申请日：2003-04-09

    Applicant: QUALCOMM INC

    Inventor： RICK ROLAND R ,  STEIN JEREMY M ,  AMERGA MESSAY ,  COBATON IVAN JESUS FERNANDEZ ,  RISTIC BIRISLAV ,  BHATIA ASHOK

    IPC: G01S5/00 ,  G01S5/02 ,  G01S5/14 ,  G01S19/27 ,  H04W64/00 ,  H04Q7/38

    Abstract: A method and apparatus for calculating a representative measurement from multiple data measurements of signals from cellular base stations, thereby facilitating utilization of a cellular network to determine position of a mobile station even in non-line of sight and/or dynamic fading environments. A method for calculating a representative measurement includes determining a window of time, selecting data measurements within the window, and calculating a representative time of arrival responsive thereto, such as averaging all data measurements within the window. A representative RMSE estimate may be calculated. To determine a window of time all data measurements within a predetermined window from an earliest time of arrival may be selected. Alternatively the window may be determined by sliding over the data measurements. The data measurements may be stored in a database in a mobile station, and the database is updated to include each new measurement.

    FREQUENCY SCAN FOR CDMA ACQUISITION
    73.
    发明专利
    FREQUENCY SCAN FOR CDMA ACQUISITION 未知

    公开(公告)号：CA2488571A1

    公开(公告)日：2003-12-24

    申请号：CA2488571

    申请日：2003-06-10

    Applicant: QUALCOMM INC

    Inventor： NEW WEN JING ,  SUBRAHMANYA PARVATHANATHAN ,  RAO SUBRAMANYA P ,  NAGPAL VIKAS ,  AMERGA MESSAY

    IPC: H04B1/00 ,  H04B7/12 ,  H04L12/56 ,  H04L27/00 ,  H04W24/00 ,  H04W48/16 ,  H04W52/00 ,  H04B1/707 ,  H04Q7/38

    Abstract: Techniques for reducing the time required for frequency scan in acquisition are disclosed. In one aspect, received power measurements are made at one or more of the possible carrier frequencies and system search is performed on o ne or more of those frequencies when the power measurement exceeds a threshold. In another aspect, the power is measured at one or more frequencies in a ban d of frequencies surrounding a frequency at which the measured power exceeded a threshold. If the measured power at one or more of the frequencies in the ba nd exceeds a second threshold, a system search is performed at one or more of those frequencies. In yet another aspect, frequencies meeting certain criter ia are sorted in order of measured power prior to system search or further powe r measurement, and subsequent processing is performed in order of descending measured power. Various other aspects are also presented. These aspects have the benefit of reducing acquisition time, which results in faster system access and allows for more efficient use of system resources.

    SYSTEM AND METHOD FOR THE DETECTION AND COMPENSATION OF RADIO SIGNAL TIME OF ARRIVAL ERRORS
    74.
    发明专利
    SYSTEM AND METHOD FOR THE DETECTION AND COMPENSATION OF RADIO SIGNAL TIME OF ARRIVAL ERRORS 未知

    公开(公告)号：AU2003233563A1

    公开(公告)日：2003-12-02

    申请号：AU2003233563

    申请日：2003-05-15

    Applicant: QUALCOMM INC

    Inventor： AMERGA MESSAY ,  RICK ROLAND

    IPC: G01S1/00 ,  G01S19/22 ,  H04B1/00 ,  H04B7/26 ,  H04B1/707

    Abstract: A system and method to reduce-the effects of TOA errors. A mobile unit, generates a correlation pulse when a signal transmitted from a base station is detected. The transmitted signal may be reflected or defracted such that multipath signals arrive at the mobile unit, leading to distortion in the generated correlation pulse and errors in accurate TOA measurements. The system models the response function and calculates the width of the pulse using the modeling function with a dynamically adjustable factor to indicate at what point down from the peak the pulse width will be calculated. Based on calculation of pulse width, a type of multipath signal may be determined and an appropriate correction factor applied to the measured TOA to provide a more accurate TOA determination. The system may apply correction factors to TOA signals from base stations in a mobile telephone unit or from signals received from GPS satellites.

    RAKE RECEIVER FOR TRACKING CLOSELY SPACED MULTIPATH
    75.
    发明专利
    RAKE RECEIVER FOR TRACKING CLOSELY SPACED MULTIPATH 未知

    公开(公告)号：CA2477591A1

    公开(公告)日：2003-09-04

    申请号：CA2477591

    申请日：2003-02-27

    Applicant: QUALCOMM INC

    Inventor： SHIU DA-SHAN ,  LIN JEREMY ,  TEAGUE EDWARD HARRISON ,  AMERGA MESSAY

    IPC: H04B1/00 ,  H04B1/707

    Abstract: Techniques for tracking closely spaced multipath and preventing finger merge without monitoring relative positions between each of a plurality of fingers are disclosed. In one aspect, motion limits are determined for each finger. Time-tracking commands that would move the position of a finger outside its respective motion limits are suppressed. In another aspect, motion limits ar e updated dynamically, the motion limits of each finger determined in accordan ce with the motion limits of fingers adjacent to it. Various other aspects are also presented. These aspects have the benefit of preventing finger merge, which allows the allocation of multiple fingers to closely spaced multipath, thus increasing performance and system capacity, and mitigating misallocatio n of system resources.

    POSITION DETERMINATION SYSTEM THAT USES A CELLULAR COMMUNICATION SYSTEM
    77.
    发明专利
    POSITION DETERMINATION SYSTEM THAT USES A CELLULAR COMMUNICATION SYSTEM 未知

    公开(公告)号：CA2470050A1

    公开(公告)日：2003-06-26

    申请号：CA2470050

    申请日：2002-12-12

    Applicant: QUALCOMM INC

    Inventor： STEIN JEREMY ,  RICK ROLAND R ,  AMERGA MESSAY ,  RISTIC BORISLAV ,  BHATIA ASHOK ,  FERNANDEZ-CORBATON IVAN

    IPC: G01S5/02 ,  G01S19/17 ,  G01S19/34 ,  G01S19/35 ,  G01S19/48 ,  H04W64/00 ,  G01S5/14 ,  H04Q7/38

    Abstract: A position determination system and apparatus for utilizing a network of cellular base stations to determine position of a mobile station includes taking a plurality of statistically independent data measurements of the pil ot signals from the base stations. Each of the data measurements includes an earliest time of arrival, providing multiple independent measurements for ea ch of the pilot signals. For each cellular base station, a representative measurement is calculated responsive to the independent measurements, which is used to determine position of the mobile station using an AFLT algorithm and/or in conjunction with a GPS algorithm. In some embodiments, the data measurements for each pilot signal further include an RMSE estimate and time of measurement for each time of arrival, and an energy measurement for all resolvable paths. If the mobile station comprises a cell phone, a cell searc h list and a GPS search list may be provided by a cell base station.

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