中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

51 records (took 0.02 seconds)

    Apparatus and method of velocity estimation
    11.
    发明专利
    Apparatus and method of velocity estimation 未知

    公开(公告)号：HK1066864A1

    公开(公告)日：2005-04-01

    申请号：HK04109624

    申请日：2004-12-06

    Applicant: QUALCOMM INC

    Inventor： WILBORN THOMAS BRIAN ,  PATEL SHIMMAN ,  SIH GILBERT C ,  ABRISHAMKAR FARROKH

    IPC: G01S11/02 ,  G01S19/25 ,  G01S19/26

    Abstract: A velocity estimate is determined from a received signal by counting the number of times a signal in one multipath crosses a predetermined threshold in a given amount of time. A signal is received and a single multipath is extracted from the received signal. Instantaneous envelope values of the extracted multipath are calculated. A plurality of the instantaneous envelope values are used to calculate a running RMS value. A level crossing threshold is determined using the running RMS value. The number of times the instantaneous envelope value crosses the level crossing threshold is counted. The number of level crossings is mapped to a velocity estimate.

    13.
    发明专利
    未知

    公开(公告)号：BR0107664A

    公开(公告)日：2004-11-03

    申请号：BR0107664

    申请日：2001-01-12

    Applicant: QUALCOMM INC

    Inventor： ABRISHAMKAR FARROKH ,  ROH MARK

    IPC: H04B1/7073 ,  H04B1/7075 ,  H04B1/7077 ,  H04B1/709 ,  H04B7/26 ,  H04W68/00 ,  H04Q7/00

    Abstract: A system for facilitating the detection and successful decoding of a quick paging channel adapted for use with a wireless communications system supporting a primary paging channel and a quick paging channel. The system includes a first mechanism for detecting a pilot signal associated with the quick paging channel based on a received signal and includes a coherent integrator of a first length and a noncoherent integrator of a second length. The second mechanism determines receiver operating characteristics of the system based on the pilot signal and a quick paging channel signal associated with the quick paging channel. The third mechanism optimizes the first length and the second length based on the receiver operating characteristics. In a specific embodiment, the first mechanism includes a CDMA receive chain for receiving the received signal and providing a digital received signal in response thereto to a sample Random Access Memory (RAM). The sample RAM includes a mechanism for sampling the digital received signal at predetermined time slots and providing a sampled received signal in response thereto. An interpolator adjusts the rate of the sampled received signal and provides a rate-adjusted signal in response thereto. The first mechanism includes a searcher that includes the first coherent integrator, a second coherent integrator, and the noncoherent integrator. A complex despreader correlates the rate-adjusted received signal with a pseudo noise candidate code and providing a correlation result in response thereto.

    Efficient system and method for facilitating quick paging channel demodulation via an efficient offline searcher in wireless communications system
    16.
    发明专利
    Efficient system and method for facilitating quick paging channel demodulation via an efficient offline searcher in wireless communications system 未知

    公开(公告)号：AU778028B2

    公开(公告)日：2004-11-11

    申请号：AU2937401

    申请日：2001-01-12

    Applicant: QUALCOMM INC

    Inventor： ABRISHAMKAR FARROKH ,  ROH MARK

    IPC: H04B1/7073 ,  H04B1/7075 ,  H04B1/7077 ,  H04B1/709 ,  H04B7/26 ,  H04W68/00 ,  H04Q7/00

    Abstract: A system for facilitating the detection and successful decoding of a quick paging channel adapted for use with a wireless communications system supporting a primary paging channel and a quick paging channel. The system includes a first mechanism for detecting a pilot signal associated with the quick paging channel based on a received signal and includes a coherent integrator of a first length and a noncoherent integrator of a second length. The second mechanism determines receiver operating characteristics of the system based on the pilot signal and a quick paging channel signal associated with the quick paging channel. The third mechanism optimizes the first length and the second length based on the receiver operating characteristics. In a specific embodiment, the first mechanism includes a CDMA receive chain for receiving the received signal and providing a digital received signal in response thereto to a sample Random Access Memory (RAM). The sample RAM includes a mechanism for sampling the digital received signal at predetermined time slots and providing a sampled received signal in response thereto. An interpolator adjusts the rate of the sampled received signal and provides a rate-adjusted signal in response thereto. The first mechanism includes a searcher that includes the first coherent integrator, a second coherent integrator, and the noncoherent integrator. A complex despreader correlates the rate-adjusted received signal with a pseudo noise candidate code and providing a correlation result in response thereto.

    Method and apparatus for pilot estimation using a prediction error method with a kalman filter and a gauss-newton algorithm
    18.
    发明专利
    Method and apparatus for pilot estimation using a prediction error method with a kalman filter and a gauss-newton algorithm 未知

    公开(公告)号：AU2003245408A8

    公开(公告)日：2003-12-22

    申请号：AU2003245408

    申请日：2003-06-05

    Applicant: QUALCOMM INC

    Inventor： ABRISHAMKAR FARROKH ,  KREUTZ-DELGADO KENNETH

    IPC: H04B1/707 ,  H04L25/03 ,  H03H21/00

    Abstract: A system is disclosed for use in a wireless communication system to provide an estimated pilot signal. The system includes a receiver and a front-end processing and despreading component in electronic communication with the receiver for despreading a CDMA signal. A pilot estimation component is in electronic communication with the front-end processing and despreading component for estimating an original pilot signal using a Kalman filter to produce a pilot estimate. A demodulation component is in electronic communication with the pilot estimation component and the front-end processing and despreading component for providing demodulated data symbols. The Kalman filter is configured by an offline system identification process that calculates parameters using a prediction error method and a Gauss-Newton algorithm and generates state estimates using the Kalman filter. The calculating and generating are iteratively performed to train the Kalman filter for real-time operation.

    Wireless communications receiver employing quick paging channel symbols
    19.
    发明专利
    Wireless communications receiver employing quick paging channel symbols 未知

    公开(公告)号：HK1051290A1

    公开(公告)日：2003-07-25

    申请号：HK03103477

    申请日：2003-05-16

    Applicant: QUALCOMM INC

    Inventor： ABRISHAMKAR FARROKH ,  PATEL SHIMMAN

    IPC: H04J13/00 ,  H04W52/02 ,  H04W68/00

    Abstract: A system for efficiently employing a quick paging channel signal to determine the presence of a forthcoming primary paging channel in a wireless communications system employing a quick paging channel and a primary paging channel. The system includes a first mechanism for selectively processing a first quick paging channel symbol and/or a second quick paging channel symbol of a received signal based on a first decision parameter and/or a second decision parameter and providing a first indication in response thereto. A second mechanism processes the first quick paging channel symbol in response to the first indication and provides a second indication in response thereto indicating whether a forthcoming primary paging channel signal should be received and processed. A third mechanism processes the second quick paging channel symbol in response to the first indication and the second indication and provides a third indication in response thereto specifying whether the primary paging channel should be received an processed. In a specific embodiment, the system is adapted for use with a mobile station and further includes a fourth mechanism for selectively employing the third mechanism when the second indication does not indicate that the forthcoming primary paging channel should be received and processed. The first decision parameter CSI1 is representative of a quality of a signal environment through which the received signal propagates and is described by the equation (I) where E pilot1 represents the normalized pilot energy of a portion of the pilot signal associated with the first quick paging symbol, and Î o1 represents a total energy of a portion of the received signal associated with the first quick paging symbol.

    Wireless communications receiver employing quick paging channel symbols and carrier signal to interference ratios to facilitate detection of a primary paging channel
    20.
    发明专利
    Wireless communications receiver employing quick paging channel symbols and carrier signal to interference ratios to facilitate detection of a primary paging channel 未知

    公开(公告)号：AU2793901A

    公开(公告)日：2001-07-31

    申请号：AU2793901

    申请日：2001-01-17

    Applicant: QUALCOMM INC

    Inventor： ABRISHAMKAR FARROKH

    IPC: H04B1/707 ,  H04B1/7075 ,  H04B1/7115 ,  H04W52/02 ,  H04W68/00 ,  H04W68/02 ,  H04Q7/00

    Abstract: A system determines if a primary paging channel should be received based on an examination of a quick paging channel. A first QPCH symbol is examined (102) and the normalized pilot energy is determined (104). If the normalized pilot energy is above a first threshold (106), the symbol is demodulated and the QPCH-symbol-to-pilot-energy ratio is determined (110) and compared against another threshold (112). If the normalized pilot energy is below the first threshold, the system proceeds to the second QPCH symbol immediately. Depending on the resulting values, a second QPCH signal is examined (108), the system sleeps (114), or the system decides (116) to process the primary paging channel directly (118). If the second signal is demodulated, and if its normalized pilot energy is high enough, it also is demodulated and the ratio of the sum-of-the-combined-QPCH-symbols to the sum-of-the-combined-pilot-energies is determined (122). If this ratio exceeds a threshold (124), the primary paging channel is processed (118); otherwise the system sleeps (114).

Patent Agency Ranking