公开(公告)号：US20070253471A1

公开(公告)日：2007-11-01

申请号：US10596431

申请日：2004-12-13

申请人： Leif Wilhelmsson ,  Andres Reial

发明人： Leif Wilhelmsson ,  Andres Reial

IPC分类号： H04B1/707

CPC分类号： H04B1/7075 ,  G01S19/29 ,  G01S19/30 ,  H04B1/707 ,  H04B1/70735 ,  H04B1/70775 ,  H04B2201/70715

摘要： A method of detecting a spreading code of a received spread-spectrum signal, in particular a spreading code identifying a space vehicle of a GPS system. The method comprises correlating the received spread-spectrum signal with a reference signal to detect the presence of one of a number of reference spreading codes. The correlating further comprises differentiating at least one of the received spread-spectrum signal, the reference signal, and the correlation signal, the correlating resulting in a differentiated correlation signal.

摘要翻译： 一种检测接收的扩频信号的扩展码的方法，特别是识别GPS系统的空间载波的扩展码。 该方法包括将接收到的扩频信号与参考信号进行相关，以检测多个参考扩展码之一的存在。 相关还包括区分接收的扩频信号，参考信号和相关信号中的至少一个，产生相关的微分相关信号。

公开(公告)号：US20070206663A1

公开(公告)日：2007-09-06

申请号：US11681183

申请日：2007-03-02

申请人： Douglas Grover ,  Christopher Patrick ,  Kai Tang

发明人： Douglas Grover ,  Christopher Patrick ,  Kai Tang

IPC分类号： H04B1/00

CPC分类号： G01S19/30 ,  G01S19/29 ,  G01S19/37 ,  H04B1/70775 ,  H04B1/708 ,  H04B2201/7071

摘要： Apparatus and methods of implementing code space search of received signals are described herein. A code space search is implemented as a searcher that perform a subtask that is dynamically reconfigurable at each boundary of an initial integration time. Each particular subtask sets forth a programmable configuration of coherent integration hypothesis that are performed during the initial integration time. The searcher stores the results of the coherent integration hypothesis in a first portion of memory. A search accelerator operates on the initial integration results. The search accelerator can perform coherent integration of various frequency bins of different timing hypothesis, can generate energy values of the coherent integration results, and can generate a non-coherent energy summation. The energy values of the coherent integrations and non-coherent energy summations are stored in a second portion of memory. The ability to reconfigure the subtasks and accelerator operation provides flexibility in search space dimensions.

摘要翻译： 本文描述了实现接收信号的码空间搜索的装置和方法。 代码空间搜索被实现为搜索器，其执行在初始积分时间的每个边界处可动态地重新配置的子任务。 每个特定子任务列出了在初始积分时间期间执行的相干积分假设的可编程配置。 搜索者将相干整合假设的结果存储在存储器的第一部分中。 搜索加速器对初始集成结果进行操作。 搜索加速器可以执行不同时间假设的各种频率段的相干整合，可以产生相干积分结果的能量值，并可以产生非相干能量求和。 相干积分和非相干能量相加的能量值被存储在存储器的第二部分中。 重新配置子任务和加速器操作的能力提供了搜索空间维度的灵活性。

公开(公告)号：US07246011B2

公开(公告)日：2007-07-17

申请号：US11549511

申请日：2006-10-13

申请人： Charles P. Norman ,  Stephen F. Rounds

发明人： Charles P. Norman ,  Stephen F. Rounds

IPC分类号： G01C21/26

CPC分类号： H04B1/70775 ,  G01S19/29 ,  G01S19/30 ,  G01S19/37 ,  H04B1/709

摘要： A two part signal acquisition process includes a parallel signal detection process and signal verification/false alarm rejection process. A massively parallel architecture of acquisition correlators search a large region of the time-frequency uncertainty during the parallel signal detection process to identify the most likely detections for each search dwell. Concurrent with the parallel signal detection process performed by the acquisition correlators, the current list of most likely detections is examined with additional search dwells in the verification/false alarm rejection process. The verification/false alarm rejection process is performed by a plurality of independent correlators or tracking channels. Under software control, the tracking channels perform repeated dwells on the most likely detections until they can be dismissed as false alarms or verified as the desired signal.

公开(公告)号：US07233627B2

公开(公告)日：2007-06-19

申请号：US09789476

申请日：2001-02-20

申请人： James A. Proctor ,  Antoine J. Rouphael ,  John E. Hoffmann ,  George Rodney Nelson, Jr.

发明人： James A. Proctor ,  Antoine J. Rouphael ,  John E. Hoffmann ,  George Rodney Nelson, Jr.

IPC分类号： H04B7/02

CPC分类号： H04W56/001 ,  H04B1/7075 ,  H04B1/70775 ,  H04B1/7103 ,  H04B7/086 ,  H04B2201/70701 ,  H04L27/2273 ,  H04L2027/0057 ,  H04L2027/0087

摘要： A method for synchronizing a CDMA receiver to a transmitter when an adaptive antenna is utilized to receive transmitted data, wherein a receiving antenna system is adapted between a 360° reception angle pattern (i.e., an omni-directional pattern) and a fixed reception angle (i.e., a directional pattern) by permitting the receiver to identify a pilot signal having the largest magnitude. The receiver minimizes interference from other pilot signals by steering antenna pattern nulls toward other transmitters. As a result, the time required for the receiver to acquire a valid pilot signal is significantly reduced.

摘要翻译： 一种当使用自适应天线来接收发射数据时将CDMA接收机同步到发射机的方法，其中接收天线系统适应于360°接收角度模式（即，全向模式）和固定接收角度 即，方向图），通过允许接收机识别具有最大幅度的导频信号。 接收器通过向其他发射机转向天线图形零点来最小化来自其他导频信号的干扰。 结果，接收机获取有效导频信号所需的时间显着减少。

公开(公告)号：US20070093961A1

公开(公告)日：2007-04-26

申请号：US11549511

申请日：2006-10-13

申请人： Charles Norman ,  Stephen Rounds

发明人： Charles Norman ,  Stephen Rounds

IPC分类号： G01C21/00 ,  H04B1/00

CPC分类号： H04B1/70775 ,  G01S19/29 ,  G01S19/30 ,  G01S19/37 ,  H04B1/709

摘要： A two part signal acquisition process includes a parallel signal detection process and signal verification/false alarm rejection process. A massively parallel architecture of acquisition correlators search a large region of the time-frequency uncertainty during the parallel signal detection process to identify the most likely detections for each search dwell. Concurrent with the parallel signal detection process performed by the acquisition correlators, the current list of most likely detections is examined with additional search dwells in the verification/false alarm rejection process. The verification/false alarm rejection process is performed by a plurality of independent correlators or tracking channels. Under software control, the tracking channels perform repeated dwells on the most likely detections until they can be dismissed as false alarms or verified as the desired signal.

摘要翻译： 两部分信号采集过程包括并行信号检测过程和信号验证/误报警拒绝过程。 采集相关器的大规模并行架构在并行信号检测过程中搜索时间 - 频率不确定性的大区域，以识别每个搜索驻留的最可能的检测。 与采集相关器执行的并行信号检测过程同时，在验证/误报警拒绝过程中，使用附加搜索驻留来检查当前最可能检测的列表。 验证/假警报拒绝处理由多个独立的相关器或跟踪信道执行。 在软件控制下，跟踪通道对最可能的检测器执行重复停留，直到它们被解除为假警报或被验证为所需信号。

公开(公告)号：US07103362B2

公开(公告)日：2006-09-05

申请号：US10473337

申请日：2002-03-27

申请人： Shiquan Wu

发明人： Shiquan Wu

IPC分类号： H04Q7/20

CPC分类号： H04B1/7087 ,  H04B1/70754 ,  H04B1/7077 ,  H04B1/70775 ,  H04L5/0007 ,  H04L5/0048 ,  H04L27/2613 ,  H04L27/2655

摘要： A method of a receiver determining the timing of a signal transmitted in a time-slotted manner, the signal comprising a sequence of information which is repeated at a known interval and has at least a known minimum length. The method performs correlation operations between groups of received slots of information, the groups spaced by the known interval. The groups are moved through the received signal, adding and removing slots, to locate a maximum correlation value sum for the group which should correspond to the timing of the slot. The method also can be used to determine a frequency offset at the receiver and/or an initial phase.

摘要翻译： 一种接收机确定以时隙方式发送的信号的定时的方法，所述信号包括以已知间隔重复且具有至少已知最小长度的信息序列。 该方法在接收到的信息时隙的组之间执行相关操作，所述组间隔了已知间隔。 通过接收的信号移动组，添加和移除时隙，以便为应该对应于时隙的定时的组定位最大相关值和。 该方法还可以用于确定接收机处的频率偏移和/或初始相位。

公开(公告)号：US07061967B2

公开(公告)日：2006-06-13

申请号：US10179645

申请日：2002-06-24

申请人： Jacob Schelm ,  Ophir Shabtay ,  Yaniv Avital ,  Ehud Reshef

发明人： Jacob Schelm ,  Ophir Shabtay ,  Yaniv Avital ,  Ehud Reshef

IPC分类号： H04B1/707

CPC分类号： H04B1/70775 ,  H04B1/70757 ,  H04B1/7113

摘要： A method and apparatus for estimating channel tap delays of multipath components in a CDMA received signal. The search for the tap delays are split into two phases namely, a phase 1 and a phase 2 search. The phase 1 search is a coarse resolution quick search adapted to generate a rough estimate of the location of the tap delays. During this phase, the candidate codes are summed and the input signal correlated with the code sum creating an ambiguity in the code associated with the multipath. A finer resolution slower phase 2 search resolves the code ambiguity present in the initial rough estimates of the phase 1 search. Additional phase 2 correlations may be performed to implement a code-tracking loop.

公开(公告)号：US20060034353A1

公开(公告)日：2006-02-16

申请号：US11259836

申请日：2005-10-27

申请人： Peter Loomis ,  Yiming Yu

发明人： Peter Loomis ,  Yiming Yu

IPC分类号： H04B1/707

CPC分类号： H04B1/70775 ,  G01S19/24 ,  G01S19/30 ,  H04B2201/70715

摘要： A GPS receiver and method using alternating “A” and “B” integration time segments. The polarities of certain GPS data bits are known beforehand and their expected reception times are known. The GPS signal in 10 millisecond “A” time segments and “B” time segments is depolarized according to the known polarities. The depolarized GPS signal during an “A” time period made up of all the “A” time segments is integrated for providing an “A” time period magnitude for each code phase. Likewise, the depolarized GPS signal during a “B” time period made up of all the “B” time segments is integrated for providing a “B” time period magnitude for each potential GPS code phase. The strongest of the time period magnitudes is compared to a correlation threshold for selecting a code phase for signal acquisition.

摘要翻译： GPS接收机和使用交替“A”和“B”积分时间段的方法。 某些GPS数据位的极性预先已知，其预期的接收时间是已知的。 10毫秒“A”时间段和“B”时间段中的GPS信号根据已知的极性被去极化。 在由所有“A”时段组成的“A”时段期间的去极化GPS信号被积分，以为每个码相提供“A”时间周期大小。 同样地，在由所有“B”时间段组成的“B”时间段期间的去极化GPS信号被积分，以为每个潜在的GPS码相位提供“B”时间周期大小。 将最强的时间段幅度与用于选择用于信号采集的码相位的相关阈值进行比较。

公开(公告)号：US06965632B2

公开(公告)日：2005-11-15

申请号：US09877993

申请日：2001-06-08

申请人： Koji Kimura ,  Joseph Chan

发明人： Koji Kimura ,  Joseph Chan

IPC分类号： H04B1/7075 ,  H04B1/7077 ,  H04B1/709 ,  H04B1/69 ,  H03D1/00 ,  H04J11/00

CPC分类号： H04B1/70755 ,  H04B1/70775 ,  H04B1/709

摘要： A method and apparatus for initial acquisition using an adaptive threshold includes performing a sort operation of a plurality of full-length correlator outputs and updating the adaptive threshold. Partial-length correlator outputs are generated and compared with an adaptive threshold. If a partial-length correlator output for a particular PN sequence timing is greater than or equal to the adaptive threshold, a full-length correlator output for that PN sequence timing is generated. A sort operation of a plurality of full-length correlator outputs is performed, and sort results are used to update the adaptive threshold. If a partial-length correlator output for a particular PN sequence timing is less than the adaptive threshold, a full-length correlator output for that PN sequence timing is not generated.

摘要翻译： 使用自适应阈值进行初始采集的方法和装置包括执行多个全长相关器输出的分类操作并更新自适应阈值。 生成部分长度相关器输出并与自适应阈值进行比较。 如果特定PN序列定时的部分长度相关器输出大于或等于自适应阈值，则生成该PN序列定时的全长相关器输出。 执行多个全长相关器输出的分类操作，并且使用分类结果来更新自适应阈值。 如果特定PN序列定时的部分长度相关器输出小于自适应阈值，则不产生用于该PN序列定时的全长相关器输出。

公开(公告)号：US20050129146A1

公开(公告)日：2005-06-16

申请号：US10734739

申请日：2003-12-12

申请人： David Akopian ,  Seppo Turunen ,  Samuli Pietila ,  Harri Valio

发明人： David Akopian ,  Seppo Turunen ,  Samuli Pietila ,  Harri Valio

IPC分类号： G01S1/00 ,  H04B1/707 ,  H04L27/14

CPC分类号： H04B1/70775 ,  G01S19/29 ,  G01S19/30 ,  H04B1/70752 ,  H04B2201/70715

摘要： The invention relates to an apparatus supporting an acquisition of a received code modulated signal by determining the correlation between the received code modulated signal and an available replica code sequence at different code phases. It is proposed that the apparatus comprises a first acquisition engine for selecting code phases which are good candidates for being the code phase at which a received code modulated signal and an available replica code sequence have the highest correlation. The apparatus further comprises a second acquisition engine for performing a refined comparison between a received code modulated signal and an available replica code sequence for each code phase selected by the first acquisition engine. The invention relates equally to a corresponding method and to a system comprising such an apparatus and a network.

摘要翻译： 本发明涉及一种支持通过在不同代码阶段确定所接收的码调制信号与可用复制码序列之间的相关性来支持所接收的码调制信号的获取的装置。 提出该装置包括：第一采集引擎，用于选择作为接收码调制信号和可用复制码序列具有最高相关性的码相位的良好候选的码相位。 该装置还包括第二采集引擎，用于对接收到的代码调制信号和由第一采集引擎选择的每个代码阶段的可用复制代码序列进行精细比较。 本发明同样涉及相应的方法和涉及包括这种装置和网络的系统。