公开(公告)号：AU2002359343C1

公开(公告)日：2008-11-20

申请号：AU2002359343

申请日：2002-11-01

Applicant: QUALCOMM INC

Inventor： FERNANDEZ-CORBATION IVAN ,  RICK ROLAND R ,  STEIN JEREMY M ,  AMERGA MESSAY

IPC: G01S1/00 ,  G01S5/02 ,  G01S19/29 ,  G01S19/30 ,  H04B1/7075 ,  H04B1/7117 ,  H04Q7/34 ,  H04Q7/38

Abstract: A parameter estimator for estimating one or more parameter(s) from a signal is described. A correlation function is derived from the signal, and the correlation function analyzed to determine if one or more first peak(s) are present, and, if so, distinguishable from the sidelobe(s) of a second peak. If the one or more first peak(s) are present and distinguishable from the sidelobe(s) of the second peak, the one or more parameter(s) are estimated from the one or more first peak(s). If the one or more first peak(s) are not present, or, if present, are not distinguishable from the sidelobe(s) of the second peak, the one or more parameter(s) are estimated from the second peak. The parameter estimator may be employed in a subscriber station to estimate a parameter such as the time of arrival of one or more base station or sector pilot signals in a wireless communication system. This information may be utilized in an overall advanced forward link trilateration (AFLT) process for estimating the location of the subscriber station.

公开(公告)号：NO20081224A

公开(公告)日：2008-05-16

申请号：NO20081224

申请日：2008-03-07

Applicant: QUALCOMM INC

Inventor： UMATT BHUPESH MANOHARLAL ,  AMERGA MESSAY ,  MITTAL VINEET

IPC: H04W48/18

CPC classification number: H04W48/16

公开(公告)号：CA2660046A1

公开(公告)日：2008-03-06

申请号：CA2660046

申请日：2007-08-28

Applicant: QUALCOMM INC

Inventor： KUMAR CHANDRA ,  RAO ANIL ,  SINGH GURDEEP ,  KESHAVA SUDARSHAN ,  AMERGA MESSAY ,  GOLLAMUDI MAHEEDHAR ,  CHIKKAPPA KIRAN

IPC: H04B1/16 ,  H04W52/02 ,  H04W76/04

Abstract: An access terminal (102) reacquires a system frame number (SFN) when a di fference between a continuous counter elapsed time (220) and a calculated el apsed time (222) exceeds a threshold. The continuous counter elapsed time (2 20) is generated by a continuous counter (122) remaining active during a sle ep state of the access terminal (102) and the calculated elapsed time (222) is based on a SFN derived from a counter value generated by a discontinuous counter (124) that is deactivated during the sleep state. In one aspect, the continuous counter (122) may be clocked by a continuous clock (118) during a sleep mode and the discontinuous counter (124) may be clocked by a faster clock (120) that is deactivated during the sleep mode. During reactivation a fter the sleep mode, the discontinuous counter (120) is set, at the counter set time, to a reset counter value (126) corresponding to an SFN indicated b y the continuous counter (122).

公开(公告)号：CA2627612A1

公开(公告)日：2007-05-10

申请号：CA2627612

申请日：2006-10-31

Applicant: QUALCOMM INC

Inventor： SHESHADRI THEJASWI BHARADWAJ M ,  DONG BRIAN ,  HSU CHIH-PING ,  AMERGA MESSAY ,  ZHU XIAOMING ,  SUBRAHMANYA PARVATHANATHAN

IPC: H04B1/7117

Abstract: A rake receiver finger assignor is configured to assign a rake receiver finger to a time offset between identified signal path time offsets in accordance with a concentration of identified signal paths from a transmitter to a rake receiver. In accordance with the exemplary embodiment, a number of identified signal paths having time offsets within a time window are observed to determine the concentration of signal paths identified by a path searcher. If the number of identified signal paths indicates a concentrated distribution of signal paths such as during a fat path condition, at least one rake finger is assigned between at a time offset between two identified signal paths.

公开(公告)号：DE60305655D1

公开(公告)日：2006-07-06

申请号：DE60305655

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.

公开(公告)号：HK1079916A1

公开(公告)日：2006-04-13

申请号：HK05112175

申请日：2005-12-30

Applicant: QUALCOMM INC

Inventor： AMERGA MESSAY ,  RICK ROLAND

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

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.

公开(公告)号：AU2003239206A1

公开(公告)日：2003-12-31

申请号：AU2003239206

申请日：2003-06-10

Applicant: QUALCOMM INC

Inventor： NAGPAL VIKAS ,  NEW WEN JING ,  RAO SUBRAMANYA P ,  SUBRAHMANYA PARVATHANATHAN ,  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 one 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 band 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 band exceeds a second threshold, a system search is performed at one or more of those frequencies. In yet another aspect, frequencies meeting certain criteria are sorted in order of measured power prior to system search or further power 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.

公开(公告)号：CA2486094A1

公开(公告)日：2003-11-27

申请号：CA2486094

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 are disclosed by which the effects of time of arrival (TOA) errors may be reduced. In a mobile unit, a correlation pulse is generated 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. This leads to a distortion in the generated correlation pulse and errors in accurate (TOA) measurements. The present invention 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 o n the calculation of pulse width, a type of multipath signal may be determined and an appropriate correction factor applied to the measured (TOA) to provid e a more accurate (TOA) determination. The system may apply correction factors to (TOA) signals from base stations in a mobile telephone unit or from signa ls received from global positioning system (GPS) satellites.

公开(公告)号：CA2466160A1

公开(公告)日：2003-05-08

申请号：CA2466160

申请日：2002-11-01

Applicant: QUALCOMM INC

Inventor： STEIN JEREMY M ,  FERNANDEZ-CORBATON IVAN ,  RICK ROLAND R ,  AMERGA MESSAY

IPC: G01S1/00 ,  G01S5/02 ,  G01S19/29 ,  G01S19/30 ,  H04B1/7075 ,  H04B1/7117 ,  H04Q7/34 ,  H04Q7/38 ,  H04B1/707 ,  G01S5/14

Abstract: A parameter estimator for estimating one or more parameter(s) from a signal is described. A correlation function is derived from the signal, and the correlation function analyzed to determine if one or more first peak(s) (312 ) are present, and, if so, distinguishable from the sidelobe(s) (318) of a second peak. If the one or more first peak(s) (312) are present and distinguishable from the sidelobe(s) (318) of the second peak, the one or mo re parameter(s) are estimated from the one or more first peak(s). If the one or more first peak(s) are not present, or, if present, are not distinguishable from the sidelobe(s) of the second peak, the one or more parameter(s) are estimated from the second peak. The parameter estimator may be employed in a subscriber station to estimate a parameter such as the time of arrival of on e or more base station or sector pilot signals in a wireless communication system. This information may be utilized in an overall advanced forward link trilateration process for estimating the location of the subscriber station.

公开(公告)号：BRPI0715665A2

公开(公告)日：2013-07-02

申请号：BRPI0715665

申请日：2007-08-28

Applicant: QUALCOMM INC

Inventor： AMERGA MESSAY ,  SINGH GURDEEP ,  RAO ANIL ,  CHIKKAPPA KIRAN ,  KUMAR CHANDRA ,  GOLLAMUDI MAHEEDHAR ,  KESHAVA SUDARSHAN

IPC: H04B1/16 ,  C01B17/50 ,  C01B17/74 ,  C01F11/46 ,  H04W52/02 ,  H04W76/04

Abstract: An access terminal (102) reacquires a system frame number (SFN) when a difference between a continuous counter elapsed time (220) and a calculated elapsed time (222) exceeds a threshold. The continuous counter elapsed time (220) is generated by a continuous counter (122) remaining active during a sleep state of the access terminal (102) and the calculated elapsed time (222) is based on a SFN derived from a counter value generated by a discontinuous counter (124) that is deactivated during the sleep state. In one aspect, the continuous counter (122) may be clocked by a continuous clock (118) during a sleep mode and the discontinuous counter (124) may be clocked by a faster clock (120) that is deactivated during the sleep mode. During reactivation after the sleep mode, the discontinuous counter (120) is set, at the counter set time, to a reset counter value (126) corresponding to an SFN indicated by the continuous counter (122).