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    METHOD AND APPARATUS FOR TIME TRACKING
    21.
    发明专利
    METHOD AND APPARATUS FOR TIME TRACKING 未知

    公开(公告)号：HU224301B1

    公开(公告)日：2005-07-28

    申请号：HU0200122

    申请日：2000-02-08

    Applicant: QUALCOMM INC

    Inventor： LEVIN JEFFREY A ,  RIDDLE CHRISTOPHER C ,  SHERMAN TOM

    IPC: H04B1/7085 ,  H04B1/707

    Abstract: In order to time track an incoming signal, a receiver demodulates a first instance of a signal to produce a first set of energy values corresponding to a set of possible data values of the signal. The receiver also demodulates a second instance of the signal to produce a second set of energy values corresponding to the set of possible data values. The receiver combines the first and the second sets of energy values to determine a combined set of energy values. The receiver determines a first estimate of a most likely transmitted data value based upon the combined set of energy values. The receiver decovers an early set of despread samples of the first instance using a symbol corresponding to the first estimate to produce a first early energy value. The receiver decovers a late set of despread samples of the first instance using the symbol corresponding to the first estimate to produce a first late energy value. Finally, the receiver determines a time offset of the first instance based upon the first early and the first late energy values.

    Method and apparatus for using frame energy metrics to improve rate determination
    25.
    发明专利
    Method and apparatus for using frame energy metrics to improve rate determination 未知

    公开(公告)号：HK1044248A1

    公开(公告)日：2002-10-11

    申请号：HK02105824

    申请日：2002-08-09

    Applicant: QUALCOMM INC

    Inventor： RIDDLE CHRISTOPHER C ,  LEVIN JEFFREY A

    IPC: H04L25/02 ,  H04L

    Abstract: A Wireless Code Division Multiple Access method and apparatus for determining the transmitted rate of a voice/data signal from a mobile station to a Base Station. Variable rate vocoders transmit voice at one of several predetermined frame rates. The receiver determines the transmitted rate based on one of several frame parameters. One of the parameters is received frame energy. The received frame energy is measured over the length of the relevant portion of the frame. Energy is measured over the half of the frame that can only contain energy if a full rate frame is sent. If the energy measured exceeds a threshold, then full rate is indicated. Else, energy is measured over the fourth of a frame that can only contain energy if a half rate frame is sent. If the energy exceeds a threshold, then half rate is indicated. The procedure is repeated for quarter and eighth rates.

    METHOD AND APPARATUS FOR TIME TRACKING
    26.
    发明专利
    METHOD AND APPARATUS FOR TIME TRACKING 未知

    公开(公告)号：HU0200122A2

    公开(公告)日：2002-04-29

    申请号：HU0200122

    申请日：2000-02-08

    Applicant: QUALCOMM INC

    Inventor： LEVIN JEFFREY A ,  RIDDLE CHRISTOPHER C ,  SHERMAN TOM

    IPC: H04B1/7085 ,  H04B1/707

    Abstract: In order to time track an incoming signal, a receiver demodulates a first instance of a signal to produce a first set of energy values corresponding to a set of possible data values of the signal. The receiver also demodulates a second instance of the signal to produce a second set of energy values corresponding to the set of possible data values. The receiver combines the first and the second sets of energy values to determine a combined set of energy values. The receiver determines a first estimate of a most likely transmitted data value based upon the combined set of energy values. The receiver decovers an early set of despread samples of the first instance using a symbol corresponding to the first estimate to produce a first early energy value. The receiver decovers a late set of despread samples of the first instance using the symbol corresponding to the first estimate to produce a first late energy value. Finally, the receiver determines a time offset of the first instance based upon the first early and the first late energy values.

    27.
    发明专利
    未知

    公开(公告)号：BR0008077A

    公开(公告)日：2002-04-23

    申请号：BR0008077

    申请日：2000-02-08

    Applicant: QUALCOMM INC

    Inventor： LEVIN JEFFREY A ,  RIDDLE CHRISTOPHER C ,  SHERMAN TOM

    IPC: H04B1/7085 ,  H04B1/707

    Abstract: In order to time track an incoming signal, a receiver demodulates a first instance of a signal to produce a first set of energy values corresponding to a set of possible data values of the signal. The receiver also demodulates a second instance of the signal to produce a second set of energy values corresponding to the set of possible data values. The receiver combines the first and the second sets of energy values to determine a combined set of energy values. The receiver determines a first estimate of a most likely transmitted data value based upon the combined set of energy values. The receiver decovers an early set of despread samples of the first instance using a symbol corresponding to the first estimate to produce a first early energy value. The receiver decovers a late set of despread samples of the first instance using the symbol corresponding to the first estimate to produce a first late energy value. Finally, the receiver determines a time offset of the first instance based upon the first early and the first late energy values.

    29.
    发明专利
    未知

    公开(公告)号：NO20012829L

    公开(公告)日：2001-08-02

    申请号：NO20012829

    申请日：2001-06-08

    Applicant: QUALCOMM INC

    Inventor： LEVIN JEFFREY A ,  RIDDLE CHRISTOPHER C ,  SHERMAN TOM B

    IPC: H04B1/7117 ,  H04B1/7115 ,  H04B1/712 ,  H04B7/26 ,  H04B1/707

    Abstract: A wireless receiver receiving multipath Wash-code symbols determines which of fingers 402, 410 have locked on a signal. Measurements of the correlation energies between the received signal and all possible symbols are stored in energy storage units 404, 412. The actual signals are combined in combiner 408. A maximum determiner 416 determines the most likely combined symbol, and an index for this symbol is fed back to the energy storage units. Lock detectors 406, 414 use the measurement for this fed-back symbol to determine whether the finger has locked onto a path. This determination is used to decide whether the next signal detected by that finger should be applied to the combiner.

    METHOD AND APPARATUS FOR USING FRAME ENERGY METRICS TO IMPROVE RATE DETERMINATION
    30.
    发明专利
    METHOD AND APPARATUS FOR USING FRAME ENERGY METRICS TO IMPROVE RATE DETERMINATION 未知

    公开(公告)号：CA2375786A1

    公开(公告)日：2000-12-21

    申请号：CA2375786

    申请日：2000-06-09

    Applicant: QUALCOMM INC

    Inventor： LEVIN JEFFREY A ,  RIDDLE CHRISTOPHER C

    IPC: H04L25/02

    Abstract: A Wireless Code Division Multiple Access method and apparatus for determinin g the transmitted rate of a voice/data signal from a mobile station to a Base Station. Variable rate vocoders transmit voice at one of several predetermin ed frame rates. The receiver determines the transmitted rate based on one of several frame parameters. One of the parameters is received frame energy. Th e received frame energy is measured over the length of the relevant portion of the frame. Energy is measured over the half of the frame that can only conta in energy if a full rate frame is sent. If the energy measured exceeds a threshold, then full rate is indicated. Else, energy is measured over the fourth of a frame that can only contain energy if a half rate frame is sent. If the energy exceeds a threshold, then half rate is indicated. The procedur e is repeated for quarter and eighth rates.

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