公开(公告)号：EP1029398A1

公开(公告)日：2000-08-23

申请号：EP98956104.8

申请日：1998-10-09

Applicant: QUALCOMM Incorporated

Inventor： HARMS, Brian ,  BUTLER, Brian ,  SKINNER, Gordon DI

IPC: H04B1/707 ,  H04B7/216

CPC classification number: H04B1/7077 ,  H04B1/707 ,  H04B1/7075 ,  H04B1/70755 ,  H04B7/216 ,  H04J13/0022

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：WO1997002663A1

公开(公告)日：1997-01-23

申请号：PCT/US1996011125

申请日：1996-06-28

Applicant: QUALCOMM INCORPORATED

Inventor： QUALCOMM INCORPORATED ,  SKINNER, Gordon ,  HARMS, Brian

IPC: H04B01/707

CPC classification number: H04B1/70775 ,  B60R11/02 ,  B60R11/04 ,  B60R2011/0035 ,  B60R2011/0059 ,  B60R2011/0075 ,  H04B1/70752 ,  H04B1/70755

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, 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.

Abstract translation: 一种用于在扩展频谱通信系统内的多个正交信道上使用由用户单元接收的能量的技术，用于通过控制用于检测这种定时的信号幅度积分间隔来获取信号定时。 接收信号（10，14,18）被解扩（40,60）和相应的放大器相干地整合（42,44,46,62），这些周期可被二进制因素分解成用于产生正交信号的沃尔什函数的长度 通道。 随后在Walsh函数边界开始和终止的时段内形成（68）该积分结果的非相干组合，并用于确定何时为解扩信号选择了正确的时间偏移。 额外的优点是通过分配一致地向通信系统内的特定正交信道提供诸如寻呼，同步和最频繁分配的业务信道的更高能量内容的信号来实现。 在示例性实施例中，使用长度为128的沃尔什函数作为信道化码，并将导频信号分配给信道0.这导致当积分周期为（64）码片时，业务信道或寻呼和同步功能被分配给信道（64） 长（32），芯片长（32），（32,64和96）。 以这种方式，在集成过程期间可以使用额外的能量来用于确定何时选择正确的信号采集定时偏移，而不使用额外的硬件。

公开(公告)号：EP0779000A1

公开(公告)日：1997-06-18

申请号：EP96926056.0

申请日：1996-06-28

Applicant: QUALCOMM INCORPORATED

Inventor： SKINNER, Gordon ,  HARMS, Brian

IPC: H04L27 ,  B60R11 ,  H04B1 ,  H04J13

CPC classification number: H04B1/70775 ,  B60R11/02 ,  B60R11/04 ,  B60R2011/0035 ,  B60R2011/0059 ,  B60R2011/0075 ,  H04B1/70752 ,  H04B1/70755

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, 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：EP1029398B1

公开(公告)日：2009-11-25

申请号：EP98956104.8

申请日：1998-10-09

Applicant: QUALCOMM INCORPORATED

Inventor： HARMS, Brian ,  BUTLER, Brian ,  SKINNER, Gordon DI

IPC: H04B1/707 ,  H04B7/216

CPC classification number: H04B1/7077 ,  H04B1/707 ,  H04B1/7075 ,  H04B1/70755 ,  H04B7/216 ,  H04J13/0022

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：EP1112622B1

公开(公告)日：2005-08-17

申请号：EP99945587.6

申请日：1999-09-08

Applicant: QUALCOMM INCORPORATED

Inventor： HARMS, Brian ,  GREGORY, Sherman

IPC: H04B1/707

CPC classification number: H04B1/708 ,  H04B1/70756 ,  H04B2201/70701

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 (506, 802) to produce a plurality of delayed pseudonoise sequences (PNIN, PNQN), combining each of the delayed pseudonoise sequences with the data stream (504) to produce a plurality of despread data streams (804), and accumulating each of the despread data streams (502) for a preselected duration to produce a plurality of coherent sums (806). Each of the coherent sums are accumulated (608) for a further duration to produce a plurality of non-coherent sums (808). The non-coherent sums are examined (308, 220, 810) to determine the most likely PN offset hypothesis (812).

公开(公告)号：EP1088400A1

公开(公告)日：2001-04-04

申请号：EP99937159.4

申请日：1999-06-14

Applicant: QUALCOMM INCORPORATED

Inventor： HARMS, Brian ,  GREGORY, Sherman, A.

IPC: H04B1/707 ,  H04B7/216

CPC classification number: H04B7/216 ,  G01S19/29 ,  H04B1/707 ,  H04L2027/0034

Abstract: A system and method for narrowing the range of frequency uncertainty of a Doppler shifted pilot signal in a satellite or other communications system (100) with relative signal source and receiver motion. The satellite communications system (100) includes a user terminal (124, 126) (for example, a mobile wireless telephone), a gateway (120, 122, 112) (terrestrial base station), and at least one satellite (116, 118) with unknown position and unknown relative velocity. The method includes the steps of shifting the pilot signal over a plurality of frequency hypotheses (309), coherently accumulating samples of the pilot signal over a plurality of chips (315), measuring the energy of the accumulated pilot signal samples (318), accumulating the energy measurements over a plurality of chips to produce an energy accumulation value (321), and determining which of the plurality of frequency hypotheses results in the highest energy accumulation value (324).

公开(公告)号：EP1123586A1

公开(公告)日：2001-08-16

申请号：EP99956605.2

申请日：1999-10-18

Applicant: QUALCOMM Incorporated

Inventor： TERASAWA, Daisuke ,  AGRAWAL, Avneesh ,  JOU, Yu-Cheun ,  HARMS, Brian ,  BUTLER, Brian, K.

IPC: H04B1/707 ,  H04J13/00

CPC classification number: H04J13/0022 ,  H04B1/707 ,  H04J13/10

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：EP0779000B1

公开(公告)日：2001-08-08

申请号：EP96926056.1

申请日：1996-06-28

Applicant: QUALCOMM Incorporated

Inventor： SKINNER, Gordon ,  HARMS, Brian

IPC: H04B1/707

CPC classification number: H04B1/70775 ,  B60R11/02 ,  B60R11/04 ,  B60R2011/0035 ,  B60R2011/0059 ,  B60R2011/0075 ,  H04B1/70752 ,  H04B1/70755

公开(公告)号：EP1112622A1

公开(公告)日：2001-07-04

申请号：EP99945587.6

申请日：1999-09-08

Applicant: QUALCOMM Incorporated

Inventor： HARMS, Brian ,  GREGORY, Sherman

IPC: H04B1/707

CPC classification number: H04B1/708 ,  H04B1/70756 ,  H04B2201/70701

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 (506, 802) to produce a plurality of delayed pseudonoise sequences (PNIN, PNQN), combining each of the delayed pseudonoise sequences with the data stream (504) to produce a plurality of despread data streams (804), and accumulating each of the despread data streams (502) for a preselected duration to produce a plurality of coherent sums (806). Each of the coherent sums are accumulated (608) for a further duration to produce a plurality of non-coherent sums (808). The non-coherent sums are examined (308, 220, 810) to determine the most likely PN offset hypothesis (812).