公开(公告)号：BR0209142A

公开(公告)日：2005-01-18

申请号：BR0209142

申请日：2002-04-24

Applicant: QUALCOMM INC

Inventor： STEIN JEREMY M ,  WEISSMAN HAIM

IPC: H04Q1/00 ,  G01S19/11 ,  G01S19/46 ,  H04B7/26 ,  H04W64/00 ,  H04W88/08 ,  H04Q7/38

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：NO20034734L

公开(公告)日：2003-12-04

申请号：NO20034734

申请日：2003-10-23

Applicant: QUALCOMM INC

Inventor： STEIN JEREMY M ,  WEISSMAN HAIM

IPC: H04Q1/00 ,  G01S19/11 ,  G01S19/46 ,  H04B7/26 ,  H04W64/00 ,  H04W88/08 ,  H04Q7/38

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：NO20034734A

公开(公告)日：2003-12-04

申请号：NO20034734

申请日：2003-10-23

Applicant: QUALCOMM INC

Inventor： STEIN JEREMY M ,  WEISSMAN HAIM

IPC: H04Q1/00 ,  G01S19/11 ,  G01S19/46 ,  H04B7/26 ,  H04W64/00 ,  H04W88/08 ,  H04Q7/38

CPC classification number: H04W64/00 ,  H04W88/085

公开(公告)号：PT970566E

公开(公告)日：2003-10-31

申请号：PT98913060

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：CA2464930A1

公开(公告)日：2003-05-08

申请号：CA2464930

申请日：2002-10-29

Applicant: QUALCOMM INC

Inventor： BHATIA ASHOK ,  RISTIC BORISLAV ,  FERNANDEZ-CORBATON IVAN ,  RICK ROLAND R ,  AMERGA MESSAY ,  STEIN JEREMY M

IPC: G01S1/00 ,  G01S19/11 ,  G01S1/04 ,  G01S5/14

Abstract: A parameter estimator for estimating one or more parameter(s) from a correlation function derived from a signal using a dynamically variable integration time is described. The parameter estimator may be employed in a subscriber station to estimate the time of arrival of one or more base stati on 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：TR200002347T2

公开(公告)日：2001-02-21

申请号：TR200002347

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：HK1026528A1

公开(公告)日：2000-12-15

申请号：HK00104270

申请日：2000-07-11

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 ,  H03M

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：ZA9901069B

公开(公告)日：2000-07-04

申请号：ZA9901069

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

公开(公告)号：BR9809566A

公开(公告)日：2000-07-04

申请号：BR9809566

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：ZA987149B

公开(公告)日：1999-02-09

申请号：ZA987149

申请日：1998-08-07

Applicant: QUALCOMM INC

Inventor： STEIN JEREMY M

IPC: H03M13/01 ,  H03M13/09 ,  H03M13/35 ,  H03M13/41 ,  H04L1/00 ,  H04L1/08 ,  H04L25/02 ,  H04L25/03 ,  H04L29/08 ,  H04L ,  G06F ,  H04B ,  H04M

Abstract: In an apparatus (200) for determining the rate of received data in a variable rate communication system, a decoder (230) decodes each frame of encoded data in a received signal at each possible data rate. The decoded data is processed by a cyclic redundancy check (CRC) element (240) to produce CRC bits. The data is reencoded and correlated by a correlator (234) with the received encoded data to produce a set of normalized correlation metrics. The decoded data may also be input to a Yamamoto detector (248) to Yamamoto quality metrics. Each operation is performed for each possible data rate. The normalized correlation metric for each rate is calculated from a correlation value and a constant computer for the rate. The correlation value is determined from a correlation of the demodulated soft frame symbols and the re-encoded frame. The highest normalized correlation metric is selected and the CRC bit for this data rate is checked. If the CRC checks, this data rate is indicated as the received data rate. Otherwise, the next highest normalized correlation metric is selected and the process continues. If no CRC checks, an erasure is indicated.