Technique for filter-enhanced clock synchronization
    51.
    发明授权
    Technique for filter-enhanced clock synchronization 失效
    滤波增强时钟同步技术

    公开(公告)号:US07409020B1

    公开(公告)日:2008-08-05

    申请号:US10732532

    申请日:2003-12-11

    IPC分类号: H04B1/10

    CPC分类号: H03L7/093 H04J3/0632

    摘要: A technique for filter-enhanced clock synchronization is disclosed. In one particular exemplary embodiment, the technique may be realized by/as a method for filter-enhanced clock synchronization. The method comprises subjecting a clock error signal to a first exponentially weighted moving average (EWMA) filter to generate a first output signal, where the first EWMA filter comprises a first gain element. And the method further comprises subjecting the first output signal to a second EWMA filter to generate a second output signal, where the second EWMA filter comprises a second gain element and the second EWMA filter is coupled with a feedback loop having a delay element and a summing junction.

    摘要翻译: 公开了一种用于滤波器增强时钟同步的技术。 在一个特定的示例性实施例中,该技术可以通过/作为滤波器增强时钟同步的方法来实现。 该方法包括使时钟误差信号经受第一指数加权移动平均(EWMA)滤波器以产生第一输出信号,其中第一EWMA滤波器包括第一增益元件。 并且该方法还包括使第一输出信号经受第二EWMA滤波器以产生第二输出信号,其中第二EWMA滤波器包括第二增益元件,而第二EWMA滤波器与具有延迟元件的反馈回路耦合, 交界处

    Techniques for time transfer via signal encoding
    52.
    发明授权
    Techniques for time transfer via signal encoding 有权
    通过信号编码进行时间传输的技术

    公开(公告)号:US07995621B2

    公开(公告)日:2011-08-09

    申请号:US12347314

    申请日:2008-12-31

    IPC分类号: H04J3/06

    摘要: Techniques for time transfer via signal encoding are disclosed. In one particular exemplary embodiment, the techniques may be realized as a method for time transfer via signal encoding comprising generating a time service ordered-set for inclusion in a physical coding sublayer frame of a physical layer device, generating time service data for inclusion in the physical coding sublayer frame of the physical layer device, and transmitting the physical coding sublayer frame.

    摘要翻译: 公开了通过信号编码进行时间传递的技术。 在一个特定的示例性实施例中,这些技术可以被实现为用于经由信号编码的时间传送的方法,包括生成用于包括在物理层设备的物理编码子层帧中的时间服务有序集,生成包括在 物理层设备的物理编码子层帧,并发送物理编码子层帧。

    Clock synchronization backup mechanism for circuit emulation service
    53.
    发明授权
    Clock synchronization backup mechanism for circuit emulation service 有权
    电路仿真服务的时钟同步备份机制

    公开(公告)号:US07191355B1

    公开(公告)日:2007-03-13

    申请号:US10888421

    申请日:2004-07-09

    IPC分类号: G06F1/12 H04L12/28

    摘要: A clock synchronization backup mechanism is disclosed for maintaining clock synchronization during periods of degraded synchronization. The clock synchronization backup mechanism includes a jitter buffer having a fill value at a given sample time which is compared with a threshold. When the jitter buffer fill value exceeds the threshold, a non-normal condition is registered and the local clock frequency is set to a combination of a long-term frequency setting plus a threshold sensitive frequency adjustment. The clock synchronization backup mechanism is particularly useful for overcoming residual errors accumulated due to temperature change, oscillator degradation, and a variety of other system perturbations problematical for clock synchronization mechanisms known in the art.

    摘要翻译: 公开了一种时钟同步备份机制,用于在降级同步期间维持时钟同步。 时钟同步备份机制包括抖动缓冲器,该抖动缓冲器在给定采样时间具有与阈值进行比较的填充值。 当抖动缓冲区填充值超过阈值时,注册非正常条件,并将本地时钟频率设置为长期频率设置加阈值敏感频率调整的组合。 时钟同步备份机制对于克服由于温度变化,振荡器衰减以及本领域已知的时钟同步机制的各种其他系统扰动而累积的残余误差特别有用。

    Queue based multi-level AQM with drop precedence differentiation
    54.
    发明授权
    Queue based multi-level AQM with drop precedence differentiation 失效
    基于队列的多级AQM具有丢弃优先级差异化

    公开(公告)号:US07286485B1

    公开(公告)日:2007-10-23

    申请号:US10680654

    申请日:2003-10-07

    摘要: Disclosed is a queue based multi-level Active Queue Management with drop precedence differentiation method and apparatus which uses queue size information for congestion control. The method provides for a lower complexity in parameter configuration and greater ease of configuration over a wide range of network conditions. A key advantage is a greater ability to maintain stabilized network queues, thereby minimizing the occurrences of queue overflows and underflows, and providing high system utilization.

    摘要翻译: 公开了一种基于队列的多级活动队列管理,具有使用队列大小信息进行拥塞控制的丢弃优先级微分方法和装置。 该方法提供了参数配置的较低复杂度,并且在广泛的网络条件下更易于配置。 一个关键的优点是维持稳定的网络队列的更大能力,从而最大限度地减少队列溢出和下溢的发生,并提供高系统利用率。

    TECHNIQUES FOR TIME TRANSFER VIA SIGNAL ENCODING
    55.
    发明申请
    TECHNIQUES FOR TIME TRANSFER VIA SIGNAL ENCODING 失效
    通过信号编码进行时间传输的技术

    公开(公告)号:US20110243156A1

    公开(公告)日:2011-10-06

    申请号:US13162242

    申请日:2011-06-16

    IPC分类号: H04J3/00 H04J3/06

    摘要: Techniques for time transfer via signal encoding are disclosed. In one particular exemplary embodiment, the techniques may be realized as a method for time transfer via signal encoding comprising generating a time service ordered-set for inclusion in a physical coding sublayer frame of a physical layer device, generating time service data for inclusion in the physical coding sublayer frame of the physical layer device, and transmitting the physical coding sublayer frame.

    摘要翻译: 公开了通过信号编码进行时间传递的技术。 在一个特定的示例性实施例中,这些技术可以被实现为用于经由信号编码的时间传送的方法,包括生成用于包括在物理层设备的物理编码子层帧中的时间服务有序集,生成包括在 物理层设备的物理编码子层帧,并发送物理编码子层帧。

    Methods and devices for channel identification
    56.
    发明授权
    Methods and devices for channel identification 有权
    频道识别的方法和设备

    公开(公告)号:US09207305B2

    公开(公告)日:2015-12-08

    申请号:US13604063

    申请日:2012-09-05

    摘要: This invention relates to methods and devices for channel identification. The invention is particularly concerned with techniques for non-line of sight channel identification. In embodiments of the invention the methods and devices are used for channel identification in wireless geolocation systems. Embodiments of the invention make use of an entropy estimation of the channel to distinguish channel conditions and in particular to identify line-of-sight and non-line-of-sight channels and which can be used to solve the NLOS problem of determining relative distances between transmitter and receiver. In particular embodiments an entropy estimation of the channel impulse response (CIR) is used to construct a robust entropy-based channel identification technique. As a result, more accurate localization in indoor and other multipath environments may be possible.

    摘要翻译: 本发明涉及用于信道识别的方法和装置。 本发明特别涉及非视线通道识别技术。 在本发明的实施例中,方法和装置用于无线地理定位系统中的信道识别。 本发明的实施例利用信道的熵估计来区分信道条件,特别是识别视线和非视距信道,并且其可以用于解决确定相对距离的NLOS问题 在发射机和接收机之间。 在特定实施例中,信道脉冲响应(CIR)的熵估计用于构建基于鲁棒熵的信道识别技术。 因此,在室内和其他多路径环境中更准确的定位是可能的。

    Method and apparatus for encoding a plurality of pre-defined codes into a search key and for locating a longest matching pre-defined code
    57.
    发明申请
    Method and apparatus for encoding a plurality of pre-defined codes into a search key and for locating a longest matching pre-defined code 失效
    用于将多个预定义代码编码到搜索关键字中并用于定位最长匹配的预定义代码的方法和装置

    公开(公告)号:US20050157724A1

    公开(公告)日:2005-07-21

    申请号:US11034839

    申请日:2005-01-14

    IPC分类号: H03M7/40 H04L12/56

    摘要: A method and apparatus for locating in a list of pre-defined codes, a longest code matching a given code. The method and apparatus involve producing a search mask encoding at least one portion of said given code and comparing the search mask to a search key having a Prefix Node Bit Array (PNBA) in which a bit is set active in at least one of a plurality of bit positions corresponding to possible bit combinations of bits in a bit string having a length equal to or less than the longest predefined code in the plurality of pre-defined codes and arranged by the lengths of possible bit combinations and by numeric values of the bit combinations, to identify a common active bit position in the search key and the search mask corresponding to one of the pre-defined codes having a length greater than all others of said pre-defined codes which correspond to common active bit positions.

    摘要翻译: 用于定位在预定义代码列表中的方法和装置,其是与给定代码匹配的最长代码。 所述方法和装置包括产生编码所述给定代码的至少一部分的搜索掩码,并且将搜索掩码与具有前缀节点位阵列(PNBA)的搜索关键字进行比较,其中将位设置为多个 对应于具有等于或小于多个预定义代码中的最长预定义代码的长度的比特串中的比特的可能比特组合的比特位置,并且由可能的比特组合的长度和比特的数值 组合,以识别搜索关键字中的公共活动比特位置和对应于具有大于对应于公共活动比特位置的所述预定义码的所有其他长度的预定义码之一的搜索掩码。

    Methods and devices for clock synchronization
    58.
    发明授权
    Methods and devices for clock synchronization 有权
    时钟同步的方法和设备

    公开(公告)号:US08873589B2

    公开(公告)日:2014-10-28

    申请号:US13602582

    申请日:2012-09-04

    IPC分类号: H04L7/04

    CPC分类号: H04J3/0667

    摘要: This invention relates to methods and devices for clock synchronization. The invention makes particular use of IEEE 1588 with offset and skew correction. In embodiments of the invention, the IEEE 1588 Precision Time Protocol is used to exchange time stamps between a time server and a client from which the client can estimate the clock offset and skew. In embodiments of the invention a free running clock at the client is provided with an estimation technique based on the time stamps from the IEEE 1588 PTP message exchange between the server and client clocks. The offset and skew from the estimation process can be combined with the local free running clock to give a synchronized local clock which is an accurate image of the master clock.

    摘要翻译: 本发明涉及时钟同步的方法和装置。 本发明特别使用具有偏移和偏斜校正的IEEE 1588。 在本发明的实施例中,IEEE 1588精确时间协议用于在时间服务器和客户端之间交换时间戳,客户端可以从客户端估计时钟偏移和偏移。 在本发明的实施例中,在客户端的自由运行时钟被提供有基于来自服务器和客户端时钟之间的IEEE 1588 PTP消息交换的时间戳的估计技术。 来自估计过程的偏移和偏移可以与本地自由运行时钟组合,以给出同步的本地时钟,其是主时钟的精确图像。

    METHODS AND DEVICES FOR CLOCK SYNCHRONIZATION
    59.
    发明申请
    METHODS AND DEVICES FOR CLOCK SYNCHRONIZATION 有权
    用于时钟同步的方法和设备

    公开(公告)号:US20140064303A1

    公开(公告)日:2014-03-06

    申请号:US13602582

    申请日:2012-09-04

    IPC分类号: H04L7/04

    CPC分类号: H04J3/0667

    摘要: This invention relates to methods and devices for clock synchronization. The invention makes particular use of IEEE 1588 with offset and skew correction. In embodiments of the invention, the IEEE 1588 Precision Time Protocol is used to exchange time stamps between a time server and a client from which the client can estimate the clock offset and skew. In embodiments of the invention a free running clock at the client is provided with an estimation technique based on the time stamps from the IEEE 1588 PTP message exchange between the server and client clocks. The offset and skew from the estimation process can be combined with the local free running clock to give a synchronized local clock which is an accurate image of the master clock.

    摘要翻译: 本发明涉及时钟同步的方法和装置。 本发明特别使用具有偏移和偏斜校正的IEEE 1588。 在本发明的实施例中,IEEE 1588精确时间协议用于在时间服务器和客户端之间交换时间戳,客户端可以从客户端估计时钟偏移和偏移。 在本发明的实施例中,在客户端的自由运行时钟被提供有基于来自服务器和客户端时钟之间的IEEE 1588 PTP消息交换的时间戳的估计技术。 来自估计过程的偏移和偏移可以与本地自由运行时钟组合,以给出同步的本地时钟,其是主时钟的精确图像。

    METHOD AND SYSTEM FOR LOCALIZATION
    60.
    发明申请
    METHOD AND SYSTEM FOR LOCALIZATION 有权
    用于本地化的方法和系统

    公开(公告)号:US20130172020A1

    公开(公告)日:2013-07-04

    申请号:US13339777

    申请日:2011-12-29

    IPC分类号: H04W24/00 H04W4/04

    CPC分类号: G01S5/0252

    摘要: This invention relates to methods and devices for entropy-based location fingerprinting, in particular for use over wireless local-area networks (WLANs). The invention has particular application in localization for indoor environments. In embodiments of the invention, an entropy-based fingerprint is determined at a number of predetermined locations within the desired area of localization during an off-line phase and subsequently used in an on-line mode to determine the location of a receiver. In particular embodiments, the fingerprint is a vector of entropy estimates of the channel transfer function (CTF) between a mobile terminal and all access points within coverage. The invention seeks to provide a fingerprinting localization solution that has a simplicity of structure, leading to advantages in storage and pattern recognition requirements, and robustness by proving a unique measure of information that is related to the channel experienced at the location of the mobile terminal.

    摘要翻译: 本发明涉及用于基于熵的位置指纹的方法和装置,特别是用于无线局域网(WLAN)上。 本发明在室内环境的定位中具有特别的应用。 在本发明的实施例中,在离线阶段期间,在所需的定位区域内的多个预定位置处确定基于熵的指纹,并随后以在线模式使用以确定接收机的位置。 在特定实施例中,指纹是移动终端与覆盖范围内的所有接入点之间的信道传递函数(CTF)的熵估计的向量。 本发明寻求提供一种指纹定位解决方案,其具有简单的结构,通过证明与在移动终端的位置处经历的信道相关的信息的独特测量,可以获得存储和模式识别要求的优势以及鲁棒性。