公开(公告)号：CA2466160C

公开(公告)日：2012-01-10

申请号：CA2466160

申请日：2002-11-01

Applicant: QUALCOMM INC

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

IPC: H04B1/707 ,  G01S1/00 ,  G01S1/04 ,  G01S5/02 ,  G01S19/22 ,  G01S19/29 ,  G01S19/30 ,  H04B1/68 ,  H04B1/7075 ,  H04B1/7117 ,  H04B7/005 ,  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) (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 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 process for estimating the location of the subscriber station.

公开(公告)号：CA2425547C

公开(公告)日：2010-12-21

申请号：CA2425547

申请日：2001-10-11

Applicant: QUALCOMM INC

Inventor： VAYANOS ALKINOOS H ,  GAAL PETER ,  STEIN JEREMY M ,  AGASHE PARAG A ,  FERNANDEZ-CORBATON IVAN JESUS ,  SOLIMAN SAMIR S

IPC: G01S1/00 ,  G01S19/05 ,  G01S19/25 ,  H04B1/707

Abstract: A system and method for assisting an integrated GPS/wireless terminal unit in acquiring one or more GPS satellite signals from the GPS satellite constellation. The invention includes a method for narrowing the PN-code phase search. That is, by accounting for the variables in geographic location and time delay relative to GPS time, the systems and methods of the present invention generate a narrow code-phase search range that enables the terminal unit to more quickly acquire and track the necessary GPS satellites, and thereby more quickly provide accurate position information to a requesting entity.

公开(公告)号：NO329575B1

公开(公告)日：2010-11-15

申请号：NO20034734

申请日：2003-10-23

Applicant: QUALCOMM INC

Inventor： STEIN JEREMY M ,  WEISSMAN HAIM

IPC: G01S19/11 ,  H04Q1/00 ,  G01S19/46 ,  H04B7/26 ,  H04W64/00 ,  H04W88/08

Abstract: Techniques to determine the position of a terminal under the coverage of a repeater in a wireless communication system. In an aspect, an identification code is transmitted for each repeater and used by the terminal (or a PDE) to unambiguously identify the repeater. The identification codes for the repeaters in the system can be implemented with PN sequences at defined offsets that are specifically reserved for repeater identification. In another aspect, the identification code for each repeater is transmitted using a spread-spectrum signal designed to have minimal impact on the performance of the system and to be recoverable by the terminal in similar manner as for a forward modulated signal. In this way, no additional hardware is required for the terminal to recover the identifier signal. In one specific design, the spread spectrum identifier signal is generated in accordance with and conforms to the IS-95 CDMA standard.

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：CA2265745C

公开(公告)日：2006-01-31

申请号：CA2265745

申请日：1997-09-11

Applicant: QUALCOMM INC

Inventor： STEIN JEREMY M

IPC: H03M13/00 ,  H03M13/09 ,  H03M20060101 ,  H03M13/41 ,  H04L20060101 ,  H04L1/00

Abstract: The present invention is a novel and improved method and apparatus for decoding a frame of digital data which contains redundant information provided to validate the decoding operation. In the present invention, a frame of data contains information bits and cyclic redundancy check (CRC) bits. The received frame is decoded and a check is conducted by CRC check (84) to determine whether the CRC bits correspond correctly for the decoded information bits. If the decoded frame passes the CRC test process, the decoded frame is provided to the user. However, if the decoded frame does not pass the CRC test, then at least one additional decoding process is performed on the received frame. In the first exemplary embodiment of the present invention, if the CRC test is failed, a noise vector of a predetermined set of noise vectors generated by noise generator (80) is summed with the received frame and the resultant frame is decoded for a second time. In the second exemplary embodiment of the present invention, when the CRC test fails, a set of the received symbols are replaced with symbol erasure indications by erasure generator (162).

公开(公告)号：AT241874T

公开(公告)日：2003-06-15

申请号：AT98913060

申请日：1998-03-20

Applicant: QUALCOMM INC

Inventor： STEIN JEREMY M ,  BAR-DAVID AYAL

IPC: H03M13/09 ,  H03M13/00 ,  H03M13/29 ,  H03M13/39 ,  H03M13/41 ,  H03M13/47 ,  H04L1/00

Abstract: A method and apparatus for decoding a frame of multi-rate encoded digital data which contains redundant information provided to validate the decoding operation. A frame of data is received which contains information bits and cyclic redundancy check (CRC) bits. In accordance with the invention, the received frame is decoded and a check is conducted to determine whether the CRC bits correspond correctly for the decoded information bits. If the decoded frame passes the CRC test process, the decoded fame is provided to the user. However, if the decoded frame does not pass the CRC test, then at least one additional decoding process is performed on the received frame. In the first exemplary embodiment of the present invention, on a failure of the CRC check, the data is decoded using a trellis decoder and the data that yields the next most likely path through the trellis is selected. In a second illustrative embodiment, if the CRC test fails, the trellis decoder then identifies all paths having metrics within a predetermined threshold of a metric associated with the optimal path through the trellis. The CRC test is then performed on the decoded frame with respect to the suboptimal paths (starting with the most likely path). If any of these paths pass the CRC check, the information bits are output by the decoder. If not, an error is declared.

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：AU2002326853A1

公开(公告)日：2003-04-01

申请号：AU2002326853

申请日：2002-09-10

Applicant: QUALCOMM INC

Inventor： STEIN JEREMY M

IPC: G01S5/06 ,  G01S5/02 ,  G01S19/03 ,  H04W64/00 ,  G01S1/02 ,  G01S5/10

Abstract: A method and apparatus of determining a lower bound of an excess delay in a time of arrival measurement of a received signal. Determining the lower bound of an excess delay in a time of arrival measurements includes receiving signals from at least two base stations and determining the time difference of arrival between the received signals from their respective base stations. Then estimating a lower bound of excess delay introduced into the signals received from the base stations based on the time of arrival of the signals from the respective base stations and a known distance between the base stations. The lower bound of excess delay may be used to adjust the estimate of a mobile unit's location based on the time of arrival measurements of the received signals.

公开(公告)号：ID26786A

公开(公告)日：2001-02-08

申请号：ID20001546

申请日：1999-02-03

Applicant: QUALCOMM INC

Inventor： BLACK PETER J ,  STEIN JEREMY M

IPC: H04B1/707 ,  H04J11/00 ,  H04L1/08 ,  H04L25/02 ,  H04L29/08

Abstract: A method and apparatus for rate determination in a communication system using orthogonal rate-dependent Walsh covering codes. Orthogonal rate-dependent Walsh codes are used to cover repeated code symbols prior to transmission over a communication link. The Walsh codes comprise orthogonal binary codes that increase by powers of two for each data rate in the system. Code symbols are repeated and then covered at the symbol rate using the inventive orthogonal Walsh codes. The symbol error rate (SER) blocks are used to generate rate-dependent SER metrics for each of the candidate rates. SER estimators (230, 232, 234, 236) associated with soft combiners (204, 206, 208, 210) using incorrect data rate hypotheses produce high symbol error rates with respect to the symbol error rate produced by the SER estimator (230, 232, 234, 236) associated with the soft combiner (204, 206, 208, 210) using the correct rate hypothesis. In another embodiment, energy metric calculators (250, 252, 254, 256) are substituted for SER estimators (230, 232, 234, 236) and used to generate rate-dependent re-encoded energy metrics for each candidate data rate. The energy metrics produce an estimate of the symbol energy, and the symbol energy is used as a data rate indicator.

公开(公告)号：ZA991069B

公开(公告)日：2000-07-04

申请号：ZA991069

申请日：1999-02-10

Applicant: QUALCOMM INC

Inventor： BLACK PETER J ,  STEIN JEREMY M

IPC: G06F20060101 ,  G08C20060101 ,  H03M20060101 ,  H04B20060101 ,  H04L20060101 ,  G06F ,  G08C ,  H03M ,  H04B ,  H04L