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55 条记录 (耗时 0.049 秒)

    Method for positioning with low geometrical dilution of position (GDOP)
    1.
    发明授权
    Method for positioning with low geometrical dilution of position (GDOP) 有权
    低几何位置稀释定位方法（GDOP）

    公开(公告)号：US06353744B1

    公开(公告)日：2002-03-05

    申请号：US09374103

    申请日：1999-08-16

    申请人： Shiquan Wu ,  Song Zhang ,  Xixian Chen

    发明人： Shiquan Wu ,  Song Zhang ,  Xixian Chen

    IPC分类号： H04Q720

    CPC分类号： H04W64/00 ,  G01S5/10

    摘要： The invention is directed to positioning with low geometrical dilution of position (GDOP). Generally, the invention is a method for positioning including the steps of transmitting a asynchronous signal from a mobile to at least one base station; receiving the asynchronous signal at each base station; for each base station, determining a spherical line of position for the mobile using the received non-synchronous signal; and positioning the mobile using the spherical lines of position. The invention is a position location system which has the merits of both spherical and hyperbolic positioning systems while avoiding their drawbacks. The invention is less sensitive to GDOP and the mathematical model is easier to handle than the known hyperbolic system. The mathematical model embodied in the invention is equivalent to a convex quadratic probing subject to an ice-cream cone constraint. The invention also embodies an efficient algorithm for this optimization model. The invention is primarily directed to position location for E911, it can also applied to any other fields where position location is used, such as, but not limited to, radar positioning, satellite positioning and navigation systems.

    摘要翻译： 本发明涉及用几何稀释几何位置（GDOP）进行定位。 通常，本发明是一种定位方法，包括以下步骤：从移动站向至少一个基站发送异步信号; 在每个基站接收异步信号; 对于每个基站，使用所接收的非同步信号确定移动站的球面行位线; 并使用球面线定位移动设备。 本发明是位置定位系统，其具有球面和双曲线定位系统的优点，同时避免了它们的缺点。 本发明对GDOP较不敏感，并且数学模型比已知的双曲线系统更容易处理。 本发明中体现的数学模型等同于经受冰淇淋锥限制的凸二次探测。 本发明还体现了该优化模型的有效算法。 本发明主要涉及用于E911的位置定位，它还可以应用于使用位置定位的任何其它领域，例如但不限于雷达定位，卫星定位和导航系统。

    System and method for estimating signal time of arrival
    2.
    发明授权
    System and method for estimating signal time of arrival 有权
    估计信号到达时间的系统和方法

    公开(公告)号：US06493380B1

    公开(公告)日：2002-12-10

    申请号：US09321819

    申请日：1999-05-28

    申请人： Shiquan Wu ,  Song Zhang ,  Xixian Chen

    发明人： Shiquan Wu ,  Song Zhang ,  Xixian Chen

    IPC分类号： H04B726

    CPC分类号： G01S5/0215 ,  G01S5/02 ,  G01S5/06 ,  H04B7/005 ,  H04L25/0234

    摘要： A method for estimating a time delay including the steps of first, estimating a channel spectrum from a received signal and a known reference signal, second, extracting a virtual array structure from the estimated channel spectrum, and third, determining the signal time delay using the virtual array structure. Further, a system for estimating a time delay including a channel spectrum estimator, means for extracting a virtual array structure and means for determining the time delay is provided. The channel spectrum estimator is used for estimating a channel spectrum from a received signal and a known reference signal. The means for extracting a virtual array structure uses the estimated channel spectrum. The means for determining the time delay uses the virtual array structure.

    摘要翻译： 一种用于估计时间延迟的方法，包括首先从接收信号估计信道频谱和已知参考信号的步骤，其次，从所估计的信道频谱中提取虚拟阵列结构，以及第三，使用 虚拟阵列结构。 此外，提供了一种用于估计包括信道频谱估计器，用于提取虚拟阵列结构的装置和用于确定时间延迟的装置的时间延迟的系统。 信道频谱估计器用于从接收信号和已知参考信号估计信道频谱。 用于提取虚拟阵列结构的装置使用估计的信道频谱。 用于确定时间延迟的方法使用虚拟阵列结构。

    Timing phase recovery method and apparatus
    3.
    发明授权
    Timing phase recovery method and apparatus 有权
    定时相恢复方法及装置

    公开(公告)号：US06549594B1

    公开(公告)日：2003-04-15

    申请号：US09329365

    申请日：1999-06-10

    申请人： Xixian Chen ,  Song Zhang ,  Shiquan Wu

    发明人： Xixian Chen ,  Song Zhang ,  Shiquan Wu

    IPC分类号： H04L700

    CPC分类号： H04L25/0202

    摘要： A method for timing phase recovery including the steps of first, estimating an open-eye sequence of a received signal, second, estimating a channel response using the open-eye sequence, and third, correlating the estimated channel response with an ideal channel response to determine the peak correlation location. The peak correlation location corresponds to the recovered timing phase. A system including means for estimating an open-eye sequence of a received signal, a channel estimator and a correlator is also provided. The channel estimator is used for estimating a channel response using the open-eye sequence and the received signal. The correlator is used for correlating the estimated channel response with an ideal channel response to determine the peak correlation location, the peak correlation location corresponding to the recovered timing phase.

    摘要翻译： 一种用于定时相位恢复的方法，包括以下步骤：首先估计接收信号的睁眼序列，其次，使用睁眼序列估计信道响应，以及第三，将所估计的信道响应与理想信道响应相关联 确定峰值相关位置。 峰值相关位置对应于恢复的定时相位。 还提供了一种包括用于估计接收信号的睁眼序列的装置，信道估计器和相关器的系统。 信道估计器用于使用睁眼序列和接收信号来估计信道响应。 相关器用于将估计的信道响应与理想信道响应相关以确定峰值相关位置，对应于恢复的定时相位的峰值相关位置。

    Signal time of arrival estimation method and system
    4.
    发明授权
    Signal time of arrival estimation method and system 有权
    信号到达时间估计方法和系统

    公开(公告)号：US06510186B1

    公开(公告)日：2003-01-21

    申请号：US09321818

    申请日：1999-05-28

    申请人： Xixian Chen ,  Song Zhang ,  Shiquan Wu

    发明人： Xixian Chen ,  Song Zhang ,  Shiquan Wu

    IPC分类号： H04L2706

    CPC分类号： H04L25/0202

    摘要： A time delay estimation method including the steps of first, estimating a channel response from a received signal, and second, determining a time delay estimate by correlating the estimated channel response with an ideal channel response. Further, a system including a channel estimator and a correlator is provided. The channel estimator is used for estimating a channel response from a received signal and the correlator is used for estimating a time delay using the channel response and an ideal channel response.

    摘要翻译： 一种时间延迟估计方法，包括以下步骤：首先，从接收信号估计信道响应，其次，通过将所估计的信道响应与理想信道响应相关来确定时延估计。此外，包括信道估计器和 提供相关器。 信道估计器用于从接收信号估计信道响应，并且相关器用于使用信道响应和理想信道响应来估计时间延迟。

    Method and system for acquisition of a time stamped signal
    5.
    发明授权
    Method and system for acquisition of a time stamped signal 有权
    用于采集时间戳信号的方法和系统

    公开(公告)号：US06704300B1

    公开(公告)日：2004-03-09

    申请号：US09374000

    申请日：1999-08-16

    申请人： Xixian Chen ,  Song Zhang ,  Shiquan Wu

    发明人： Xixian Chen ,  Song Zhang ,  Shiquan Wu

    IPC分类号： H04J306

    CPC分类号： H04J3/0697 ,  G01S5/12 ,  H04L7/042

    摘要： The invention is directed to a method and system for acquisition of a time stamped signal burst while preserving timing information. A system for acquisition of a time stamped signal burst while preserving timing information. The system includes a first framer, an offset frequency compensator and a second framer. The first framer is for framing a buffered signal burst using least mean squares tuning to produce a first time stamp. The offset frequency compensator is for substantially removing a frequency offset from the first time stamp to produce a rough signal burst. The second framer is for framing the rough signal burst using least mean squares tuning to produce a fine signal burst arid a second time stamp, the second time stamp being more reliable than the first time stamp. A method system or acquisition of a time stamped signal burst while preserving timing information including the steps of framing using LMS and compensating for frequency offset. An advantage of the invention is increased reliability of the time stamp of the acquired signal burst.

    摘要翻译： 本发明涉及一种用于在保留定时信息的同时采集时间戳信号脉冲串的方法和系统。 一种用于获取时间戳信号脉冲串同时保持定时信息的系统。 该系统包括第一成帧器，偏移频率补偿器和第二成帧器。 第一个成帧器用于使用最小均方调整来构建缓冲的信号突发以产生第一时间戳。 偏移频率补偿器用于基本上从第一时间戳移除频率偏移以产生粗略的信号脉冲串。 第二成帧器用于使用最小均方调整来构图粗略信号突发以产生精细信号脉冲串和第二时间戳，第二时间戳比第一时间戳更可靠。 一种方法系统或时间戳信号脉冲串的采集，同时保持定时信息，包括使用LMS进行成帧和补偿频率偏移的步骤。 本发明的一个优点是增加了获取的信号脉冲串的时间戳的可靠性。

    Selecting from among plural channel estimation techniques
    6.
    发明授权
    Selecting from among plural channel estimation techniques 有权
    从多个信道估计技术中进行选择

    公开(公告)号：US09131515B2

    公开(公告)日：2015-09-08

    申请号：US13383721

    申请日：2010-07-15

    申请人： Jiandong Zhuang ,  Xixian Chen ,  Edward Ken Kiu Mah

    发明人： Jiandong Zhuang ,  Xixian Chen ,  Edward Ken Kiu Mah

    IPC分类号： H04W24/00 ,  H04W72/08 ,  H04L25/02

    CPC分类号： H04W72/085 ,  H04L25/022 ,  H04L25/024

    摘要： A wireless receiver receives reference signals over a wireless link. The wireless receiver calculates a selection indication based on the received reference signals, and the wireless receiver selects from among plural channel estimation techniques based on the selection indication, where the selected channel estimation technique is usable to perform channel estimation of the wireless link.

    摘要翻译： 无线接收器通过无线链路接收参考信号。 无线接收机基于接收到的参考信号来计算选择指示，无线接收机根据选择指示从多个信道估计技术中进行选择，其中选择的信道估计技术可用于执行无线链路的信道估计。

    Active set management enhancement for reliable soft handoff in 1XEV-DO system
    7.
    发明授权
    Active set management enhancement for reliable soft handoff in 1XEV-DO system 有权
    1XEV-DO系统可靠软切换的主动集管理增强

    公开(公告)号：US08699415B2

    公开(公告)日：2014-04-15

    申请号：US13098863

    申请日：2011-05-02

    申请人： Xixian Chen ,  Weigang Li ,  Vasanta Chivukula ,  Shiva Mirzaei-Rezaei ,  Brian Troup ,  Miroslav Budic ,  Yong Zhou ,  Ryan Santa

    发明人： Xixian Chen ,  Weigang Li ,  Vasanta Chivukula ,  Shiva Mirzaei-Rezaei ,  Brian Troup ,  Miroslav Budic ,  Yong Zhou ,  Ryan Santa

    IPC分类号： H04W4/00

    CPC分类号： H04W36/18 ,  H04W72/042

    摘要： A method and system for connection management in a wireless data network, such as a 1xEV-DO network adds connections to new network sectors upon receipt of a connection request from an active terminal, but removes data connections that the active terminal requests to be dropped only after confirmation from the active terminal that a channel allocation message has been received and applied. The active network maintains an active set of connections that is at least as large as the active set maintained by the active terminal and does not initiate a connection termination if no confirmation of the channel allocation message is received. This allows for a reduction in the number of dropped connections.

    摘要翻译： 在诸如1xEV-DO网络的无线数据网络中的连接管理的方法和系统在从活动终端接收到连接请求时添加到新网络扇区的连接，但是移除活动终端请求仅丢弃的数据连接 在从活动终端确认已经接收并应用信道分配消息之后。 活动网络维护至少与由活动终端维护的活动集一样大的连接的活跃集合，并且如果不接收到信道分配消息的确认，则不发起连接终止。 这样可以减少掉线连接的数量。