中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

54 records (took 0.022 seconds)

    Multipath doppler adjusted frequency tracking loop
    32.
    发明专利
    Multipath doppler adjusted frequency tracking loop 未知

    公开(公告)号：AU774691B2

    公开(公告)日：2004-07-01

    申请号：AU3655901

    申请日：2001-01-26

    Applicant: QUALCOMM INC

    Inventor： AGRAWAL AVNEESH ,  SIH GILBERT ,  ROH MARK ,  BUTLER BRIAN ,  CHALLA RAGHU

    IPC: H04B1/712 ,  H04B1/7073 ,  H04B1/7087 ,  H04B1/7115 ,  H04B1/7117 ,  H04L27/00 ,  H04B1/00

    Abstract: A method and apparatus for frequency tracking is described. The present invention provides a tracking mechanism for removing the effects of error due to frequency offset as well as compensation for frequency error due to doppler in a plurality of multipath signals. Each finger of a RAKE receiver utilizing the present invention will compute a frequency error for that finger. The weighted average of all of these frequency errors is calculated and filtered to provide a control signal for varying the frequency of IF and RF frequency synthesizers, accounting for the common frequency offset seen at each finger. Additionally, each finger is equipped with a rotator for providing frequency adjustment specific to that finger. The frequency of each finger is adjusted through feedback of the frequency error for that finger.

    33.
    发明专利
    未知

    公开(公告)号：DE69805832T2

    公开(公告)日：2003-01-23

    申请号：DE69805832

    申请日：1998-10-14

    Applicant: QUALCOMM INC

    Inventor： SILBERGER AMNON ,  BUTLER BRIAN ,  SCHIFF LEONARD

    IPC: H04B17/00 ,  H04Q7/38 ,  H04B7/26 ,  G01R23/20

    Abstract: A method and apparatus for accurately determining the operating characteristics or impact of nonlinear effects on devices or communication systems transferring orthogonally coded spread-spectrum communication signals. A Walsh Power Ratio, is used to more accurately determine system response. This information can be used by power control loops in controlling or adjusting the operation of nonlinear elements or stages such as high power amplifiers in orthogonal CDMA communication systems to provide improved system response. The information can also be employed in assigning channels to systems users, and to proceed with physical changes to system hardware. The measurements used to formulate the WPR can be made to individual components or to entire systems by injecting communication signals in multiple channels containing data, and leaving at least one empty channel. The received power per channel on the output side of the system or device is then measured. A ratio of power density for the empty to the active channels is then formed. The determination of WPR for a system or components can be realized during periods of operation through periodic transfer of test signals either at allocated times or by interleaving among existing traffic signals in the system.

    Multi-layered PN code spreading in a multi-user communications system
    34.
    发明专利
    Multi-layered PN code spreading in a multi-user communications system 未知

    公开(公告)号：AU754257B2

    公开(公告)日：2002-11-07

    申请号：AU1270299

    申请日：1998-10-09

    Applicant: QUALCOMM INC

    Inventor： HARMS BRIAN ,  BUTLER BRIAN ,  SKINNER GORDON

    IPC: H04J13/12 ,  H04B1/707 ,  H04B1/7075 ,  H04B1/7077 ,  H04B7/216 ,  H04J13/00

    Abstract: A technique for spreading information signals in a spread spectrum communication system to provide increased signal acquisition speed. A first PN spreading code or code set is used to spread information signals along with a second PN spreading code sequence or function. The second PN code is synchronized with the first PN spreading code, but has a larger code period so that each code chip of the second PN code extends over the entire period of the first PN code. The longer period spreading code forms an outer code which helps provide unambiguous beam identification and easily acquired frame timing in the presence of dynamically changing signal path delay, improving signal acquisition.

    35.
    发明专利
    未知

    公开(公告)号：DE69805832D1

    公开(公告)日：2002-07-11

    申请号：DE69805832

    申请日：1998-10-14

    Applicant: QUALCOMM INC

    Inventor： SILBERGER AMNON ,  BUTLER BRIAN ,  SCHIFF LEONARD

    IPC: H04B17/00 ,  H04Q7/38 ,  H04B7/26 ,  G01R23/20

    Abstract: A method and apparatus for accurately determining the operating characteristics or impact of nonlinear effects on devices or communication systems transferring orthogonally coded spread-spectrum communication signals. A Walsh Power Ratio, is used to more accurately determine system response. This information can be used by power control loops in controlling or adjusting the operation of nonlinear elements or stages such as high power amplifiers in orthogonal CDMA communication systems to provide improved system response. The information can also be employed in assigning channels to systems users, and to proceed with physical changes to system hardware. The measurements used to formulate the WPR can be made to individual components or to entire systems by injecting communication signals in multiple channels containing data, and leaving at least one empty channel. The received power per channel on the output side of the system or device is then measured. A ratio of power density for the empty to the active channels is then formed. The determination of WPR for a system or components can be realized during periods of operation through periodic transfer of test signals either at allocated times or by interleaving among existing traffic signals in the system.

    Multipath doppler adjusted frequency tracking loop
    36.
    发明专利
    Multipath doppler adjusted frequency tracking loop 未知

    公开(公告)号：AU3655901A

    公开(公告)日：2001-08-20

    申请号：AU3655901

    申请日：2001-01-26

    Applicant: QUALCOMM INC

    Inventor： AGRAWAL AVNEESH ,  SIH GILBERT ,  ROH MARK ,  BUTLER BRIAN ,  CHALLA RAGHU

    IPC: H04B1/712 ,  H04B1/7073 ,  H04B1/7087 ,  H04B1/7115 ,  H04B1/7117 ,  H04L27/00 ,  H04B1/00

    Abstract: A method and apparatus for frequency tracking is described. The present invention provides a tracking mechanism for removing the effects of error due to frequency offset as well as compensation for frequency error due to doppler in a plurality of multipath signals. Each finger of a RAKE receiver utilizing the present invention will compute a frequency error for that finger. The weighted average of all of these frequency errors is calculated and filtered to provide a control signal for varying the frequency of IF and RF frequency synthesizers, accounting for the common frequency offset seen at each finger. Additionally, each finger is equipped with a rotator for providing frequency adjustment specific to that finger. The frequency of each finger is adjusted through feedback of the frequency error for that finger.

    37.
    发明专利
    未知

    公开(公告)号：BR9813861A

    公开(公告)日：2000-09-26

    申请号：BR9813861

    申请日：1998-10-14

    Applicant: QUALCOMM INC

    Inventor： SILBERGER AMNON ,  BUTLER BRIAN ,  SCHIFF LEONARD

    IPC: H04B17/00 ,  H04Q7/38 ,  H04B7/26 ,  G01R23/20

    Abstract: A method and apparatus for accurately determining the operating characteristics or impact of nonlinear effects on devices or communication systems transferring orthogonally coded spread-spectrum communication signals. A Walsh Power Ratio, is used to more accurately determine system response. This information can be used by power control loops in controlling or adjusting the operation of nonlinear elements or stages such as high power amplifiers in orthogonal CDMA communication systems to provide improved system response. The information can also be employed in assigning channels to systems users, and to proceed with physical changes to system hardware. The measurements used to formulate the WPR can be made to individual components or to entire systems by injecting communication signals in multiple channels containing data, and leaving at least one empty channel. The received power per channel on the output side of the system or device is then measured. A ratio of power density for the empty to the active channels is then formed. The determination of WPR for a system or components can be realized during periods of operation through periodic transfer of test signals either at allocated times or by interleaving among existing traffic signals in the system.

    Methods and apparatus for measuring nonlinear effects in a communication system and for selecting channels on the basis of the results
    39.
    发明专利
    Methods and apparatus for measuring nonlinear effects in a communication system and for selecting channels on the basis of the results 未知

    公开(公告)号：AU1189199A

    公开(公告)日：1999-05-03

    申请号：AU1189199

    申请日：1998-10-14

    Applicant: QUALCOMM INC

    Inventor： SILBERGER AMNON ,  BUTLER BRIAN ,  SCHIFF LEONARD

    IPC: H04B17/00 ,  H04Q7/38 ,  H04B7/26 ,  G01R23/20

    Abstract: A method and apparatus for accurately determining the operating characteristics or impact of nonlinear effects on devices or communication systems transferring orthogonally coded spread-spectrum communication signals. A Walsh Power Ratio, is used to more accurately determine system response. This information can be used by power control loops in controlling or adjusting the operation of nonlinear elements or stages such as high power amplifiers in orthogonal CDMA communication systems to provide improved system response. The information can also be employed in assigning channels to systems users, and to proceed with physical changes to system hardware. The measurements used to formulate the WPR can be made to individual components or to entire systems by injecting communication signals in multiple channels containing data, and leaving at least one empty channel. The received power per channel on the output side of the system or device is then measured. A ratio of power density for the empty to the active channels is then formed. The determination of WPR for a system or components can be realized during periods of operation through periodic transfer of test signals either at allocated times or by interleaving among existing traffic signals in the system.

    TIME TRACKING IN A NON-NEGLIGIBLE MULTIPATH SPACING ENVIRONMENT
    40.
    发明专利
    TIME TRACKING IN A NON-NEGLIGIBLE MULTIPATH SPACING ENVIRONMENT 未知

    公开(公告)号：CA2434116C

    公开(公告)日：2010-03-16

    申请号：CA2434116

    申请日：2002-01-11

    Applicant: QUALCOMM INC

    Inventor： RICK ROLAND REINHARD ,  SUBRAHMANYA PARVATHANATHAN ,  BUTLER BRIAN ,  PATEL SHIMMAN ,  EKVETCHAVAT THUNYACHATE

    IPC: H04B7/06 ,  H04B7/08

    Abstract: In an antenna diverstiy environment, the timing offset of the receiver's fingers are based on the timing offset of the received peaks of the base station transmit signals. In a system with non-neglible multipath spacing, the timing offset of the received peaks of the base station transmit signals are not necessarily at the same location. In one embodiment, the demodulating elements for the signal from each base station antenna use the same offset for demodulating and determining an error signal based on pilot signal sampling prior to the timing offset and subsequent to the timing offset. The error signals are averaged and used by a time trackin loop to track the incoming signal. In another embodiment, the demodulating elements for the signal from each base station antenna independently time track the signals with different times offsets for each finger. The preferred embodiment depends on the method used by the base station to multiplex the data onto multiple transmit antennas.

Patent Agency Ranking