公开(公告)号：CA2202621C

公开(公告)日：2005-11-15

申请号：CA2202621

申请日：1996-06-28

Applicant: QUALCOMM INC

Inventor： HARMS BRIAN ,  SKINNER GORDON

IPC: H04B1/69 ,  H04B1/76 ,  H04J13/00

Abstract: A technique for using energy received by subscriber units over multiple orthogonal channels within a spread spectrum communication system to acquire signal timing by controlling signal amplitude integration intervals used in detecting such timing. Received signals (10, 14, 18) are despread (40, 60) and respective amplitues coherently integrated (42, 44, 46, 62) over periods that are divisible by factors of two into the length of Walsh functions used to generate orthogonal signal channels. Non-coherent combinations of the results of this integration are subsequently formed (68) over periods that commence and terminate on Walsh function boundaries, and used to determine when a correct time offset has been selected for despreading signals. Additional advantages are realized by assigning signals that consistently provide a higher energy content such as paging, synchronization, and most frequently assigned traffic channels to specific orthogonal channels within the communication system. In exemplary embodiments, Welsh functions of length 12 8 are used as channelizing codes and a pilot signal is assigned to channel 0. This results in traffic channels or paging and synchronization functions being assigned to channel (64) when the integration periods are (64) chips long, and to channels (32, 64 and 96) whe n the periods are (32) chips long. In this manner, additional energy is available during the integration process for use in determining wh en correct signal acquisition timing offsets have been selected, without the use of additional hardware.

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.

公开(公告)号：ES2160828T3

公开(公告)日：2001-11-16

申请号：ES96926056

申请日：1996-06-28

Applicant: QUALCOMM INC

Inventor： SKINNER GORDON ,  HARMS BRIAN

IPC: H04L27/32 ,  B60R11/00 ,  B60R11/02 ,  B60R11/04 ,  H04B1/7075 ,  H04B1/7077 ,  H04B1/707

Abstract: A technique for using energy received by subscriber units over multiple orthogonal channels within a spread spectrum communication system to acquire signal timing by controlling signal amplitude integration intervals used in detecting such timing. Received signals are despread and respective amplitudes integrated over periods that are divisible by factors of 2 into the length of Walsh functions used to generate orthogonal signal channels. Non-coherent combinations of the results of this integration are subsequently formed over periods that commence and terminate on Walsh function boundaries, and used to determine when a correct time offset has been selected for despreading signals. Additional advantages are realized by assigning signals that consistently provide a higher energy content such as paging, synchronization, and most frequently assigned traffic channels to specific orthogonal channels within the communication system. In exemplary embodiments, Walsh functions of length 128 are used as channelizing codes and a pilot signal is assigned to channel 0. This results in traffic channels or paging and synchronization functions being assigned to channel 64 when the integration periods are 64 chips long, and to channels 32, 64, and 96 when the periods are 32 chips long. In this manner, additional energy is available during the integration process for use in determining when correct signal acquisition timing offsets have been selected, without the use of additional hardware.

公开(公告)号：DE69614348D1

公开(公告)日：2001-09-13

申请号：DE69614348

申请日：1996-06-28

Applicant: QUALCOMM INC

Inventor： SKINNER GORDON ,  HARMS BRIAN

IPC: H04L27/32 ,  B60R11/00 ,  B60R11/02 ,  B60R11/04 ,  H04B1/7075 ,  H04B1/7077 ,  H04B1/707

Abstract: A technique for using energy received by subscriber units over multiple orthogonal channels within a spread spectrum communication system to acquire signal timing by controlling signal amplitude integration intervals used in detecting such timing. Received signals are despread and respective amplitudes integrated over periods that are divisible by factors of 2 into the length of Walsh functions used to generate orthogonal signal channels. Non-coherent combinations of the results of this integration are subsequently formed over periods that commence and terminate on Walsh function boundaries, and used to determine when a correct time offset has been selected for despreading signals. Additional advantages are realized by assigning signals that consistently provide a higher energy content such as paging, synchronization, and most frequently assigned traffic channels to specific orthogonal channels within the communication system. In exemplary embodiments, Walsh functions of length 128 are used as channelizing codes and a pilot signal is assigned to channel 0. This results in traffic channels or paging and synchronization functions being assigned to channel 64 when the integration periods are 64 chips long, and to channels 32, 64, and 96 when the periods are 32 chips long. In this manner, additional energy is available during the integration process for use in determining when correct signal acquisition timing offsets have been selected, without the use of additional hardware.

公开(公告)号：AU1317600A

公开(公告)日：2000-05-08

申请号：AU1317600

申请日：1999-10-18

Applicant: QUALCOMM INC

Inventor： TERASAWA DAISUKE ,  AGRAWAL AVNEESH ,  JOU YU-CHEUN ,  HARMS BRIAN ,  BUTLER BRIAN K

IPC: H04B1/707 ,  H04J13/00

Abstract: Method for PN spreading a SCMA signal using a truncated PN sequence. Method for generating said truncated PN sequence. Method for generating a second truncated PN sequence by masking the first truncated sequence. A method for generating a phase shifted version of a truncated PN sequence.

公开(公告)号：AU6635696A

公开(公告)日：1997-02-05

申请号：AU6635696

申请日：1996-06-28

Applicant: QUALCOMM INC

Inventor： SKINNER GORDON ,  HARMS BRIAN

IPC: H04L27/32 ,  B60R11/00 ,  B60R11/02 ,  B60R11/04 ,  H04B1/7075 ,  H04B1/7077 ,  H04B1/707

Abstract: A technique for using energy received by subscriber units over multiple orthogonal channels within a spread spectrum communication system to acquire signal timing by controlling signal amplitude integration intervals used in detecting such timing. Received signals are despread and respective amplitudes integrated over periods that are divisible by factors of 2 into the length of Walsh functions used to generate orthogonal signal channels. Non-coherent combinations of the results of this integration are subsequently formed over periods that commence and terminate on Walsh function boundaries, and used to determine when a correct time offset has been selected for despreading signals. Additional advantages are realized by assigning signals that consistently provide a higher energy content such as paging, synchronization, and most frequently assigned traffic channels to specific orthogonal channels within the communication system. In exemplary embodiments, Walsh functions of length 128 are used as channelizing codes and a pilot signal is assigned to channel 0. This results in traffic channels or paging and synchronization functions being assigned to channel 64 when the integration periods are 64 chips long, and to channels 32, 64, and 96 when the periods are 32 chips long. In this manner, additional energy is available during the integration process for use in determining when correct signal acquisition timing offsets have been selected, without the use of additional hardware.

公开(公告)号：AT450084T

公开(公告)日：2009-12-15

申请号：AT98956104

申请日：1998-10-09

Applicant: QUALCOMM INC

Inventor： HARMS BRIAN ,  BUTLER BRIAN ,  SKINNER GORDON DI

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.

公开(公告)号：DE69926767D1

公开(公告)日：2005-09-22

申请号：DE69926767

申请日：1999-09-08

Applicant: QUALCOMM INC

Inventor： HARMS BRIAN ,  GREGORY SHERMAN

IPC: H04B1/7075 ,  H04B1/708 ,  H04B1/707

Abstract: The present invention is a method and apparatus for detecting the presence of or acquiring a signal in a data stream, where the signal has been spread using a pseudonoise sequence. The method comprises the steps of delaying a pseudonoise sequence by a plurality of predetermined delays to produce a plurality of delayed pseudonoise sequences, combining each of the delayed pseudonoise sequences with the data stream to produce a plurality of despread data streams, and accumulating each of the despread data streams for a preselected duration to produce a plurality of coherent sums. Each of the coherent sums are accumulated for a further duration to produce a plurality of non-coherent sums. The non-coherent sums are examined to determine the most likely PN offset hypothesis.

公开(公告)号：DE69614348T2

公开(公告)日：2002-06-13

申请号：DE69614348

申请日：1996-06-28

Applicant: QUALCOMM INC

Inventor： SKINNER GORDON ,  HARMS BRIAN

IPC: H04L27/32 ,  B60R11/00 ,  B60R11/02 ,  B60R11/04 ,  H04B1/7075 ,  H04B1/7077 ,  H04B1/707

Abstract: A technique for using energy received by subscriber units over multiple orthogonal channels within a spread spectrum communication system to acquire signal timing by controlling signal amplitude integration intervals used in detecting such timing. Received signals are despread and respective amplitudes integrated over periods that are divisible by factors of 2 into the length of Walsh functions used to generate orthogonal signal channels. Non-coherent combinations of the results of this integration are subsequently formed over periods that commence and terminate on Walsh function boundaries, and used to determine when a correct time offset has been selected for despreading signals. Additional advantages are realized by assigning signals that consistently provide a higher energy content such as paging, synchronization, and most frequently assigned traffic channels to specific orthogonal channels within the communication system. In exemplary embodiments, Walsh functions of length 128 are used as channelizing codes and a pilot signal is assigned to channel 0. This results in traffic channels or paging and synchronization functions being assigned to channel 64 when the integration periods are 64 chips long, and to channels 32, 64, and 96 when the periods are 32 chips long. In this manner, additional energy is available during the integration process for use in determining when correct signal acquisition timing offsets have been selected, without the use of additional hardware.

公开(公告)号：AT204104T

公开(公告)日：2001-08-15

申请号：AT96926056

申请日：1996-06-28

Applicant: QUALCOMM INC

Inventor： SKINNER GORDON ,  HARMS BRIAN

IPC: H04L27/32 ,  B60R11/00 ,  B60R11/02 ,  B60R11/04 ,  H04B1/7075 ,  H04B1/7077 ,  H04B1/707

Abstract: A technique for using energy received by subscriber units over multiple orthogonal channels within a spread spectrum communication system to acquire signal timing by controlling signal amplitude integration intervals used in detecting such timing. Received signals are despread and respective amplitudes integrated over periods that are divisible by factors of 2 into the length of Walsh functions used to generate orthogonal signal channels. Non-coherent combinations of the results of this integration are subsequently formed over periods that commence and terminate on Walsh function boundaries, and used to determine when a correct time offset has been selected for despreading signals. Additional advantages are realized by assigning signals that consistently provide a higher energy content such as paging, synchronization, and most frequently assigned traffic channels to specific orthogonal channels within the communication system. In exemplary embodiments, Walsh functions of length 128 are used as channelizing codes and a pilot signal is assigned to channel 0. This results in traffic channels or paging and synchronization functions being assigned to channel 64 when the integration periods are 64 chips long, and to channels 32, 64, and 96 when the periods are 32 chips long. In this manner, additional energy is available during the integration process for use in determining when correct signal acquisition timing offsets have been selected, without the use of additional hardware.