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公开(公告)号：US09548832B1
公开(公告)日：2017-01-17
申请号：US12820058
申请日：2010-06-21
申请人： James Cho , William J. McFarland , Ning Zhang
发明人： James Cho , William J. McFarland , Ning Zhang
IPC分类号： H04J3/06 , H04N21/43 , H04N21/4363
CPC分类号： H04W56/001 , H04J3/0661 , H04J3/0664 , H04J3/067 , H04N21/4305 , H04N21/43615 , H04N21/43637
摘要： A system and method for closely synchronizing the transmission of real-time data streams is described. Synchronization data is transmitted by a cycle master for receipt by one or more cycle slaves. A cycle slave updates an internal state based on synchronization data received from the cycle master. This internal state may govern reproduction of received real-time data streams by the cycle slave. Such synchronization data may be inserted into transmitted media streams. The cycle slave internal state may be more accurately set by calculating timing differences between the cycle master and cycle slave and periodically adjusting that internal state between receipt of the synchronization data from the cycle master.
摘要翻译： 描述了用于紧密同步实时数据流的传输的系统和方法。 同步数据由循环主站传送，以便由一个或多个循环从站接收。 循环从站根据从循环主站接收的同步数据更新内部状态。 该内部状态可以管理由循环从站接收的实时数据流的再现。 这样的同步数据可以被插入到所传送的媒体流中。 循环从站内部状态可以通过计算循环主站和从站从站之间的定时差异并周期性地调整从循环主站接收到同步数据之间的内部状态来更精确地设置。
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公开(公告)号：US08755756B1
公开(公告)日：2014-06-17
申请号：US12769536
申请日：2010-04-28
IPC分类号： H04B1/04
摘要： Various methods and corresponding active interference cancellation units are described. These methods and units can perform active interference cancellation in a system including multiple radios. Notably, signals from a first radio can be received as interference at a second radio. The described methods and units can provide interference conditioning, which manipulates an interference reference of the interference at the first radio to approximate an interference observed at the second radio. After tuning of the interference conditioning, the interference can be removed.
摘要翻译： 描述各种方法和相应的主动干扰消除单元。 这些方法和单元可以在包括多个无线电的系统中执行主动干扰消除。 值得注意的是，来自第一无线电的信号可以作为第二无线电的干扰被接收。 所描述的方法和单元可以提供干扰调节，其处理在第一无线电处的干扰的干扰参考以近似在第二无线电处观察到的干扰。 在调谐干扰调节之后，可以去除干扰。
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公开(公告)号：US07792158B1
公开(公告)日：2010-09-07
申请号：US11197773
申请日：2005-08-03
申请人： James Cho , William J. McFarland , Ning Zhang
发明人： James Cho , William J. McFarland , Ning Zhang
IPC分类号： H04J3/06
CPC分类号： H04W56/001 , H04J3/0661 , H04J3/0664 , H04J3/067 , H04N21/4305 , H04N21/43615 , H04N21/43637
摘要： A system and method for closely synchronizing the transmission of real-time data streams is described. Synchronization data is transmitted by a cycle master for receipt by one or more cycle slaves. A cycle slave updates an internal state based on synchronization data received from the cycle master. This internal state may govern reproduction of received real-time data streams by the cycle slave. Such synchronization data may be inserted into transmitted media streams. The cycle slave internal state may be more accurately set by calculating timing differences between the cycle master and cycle slave and periodically adjusting that internal state between receipt of the synchronization data from the cycle master.
摘要翻译： 描述了用于紧密同步实时数据流的传输的系统和方法。 同步数据由循环主站传送，以便由一个或多个循环从站接收。 循环从站根据从循环主站接收的同步数据更新内部状态。 该内部状态可以管理由循环从站接收的实时数据流的再现。 这样的同步数据可以被插入到所传送的媒体流中。 循环从站内部状态可以通过计算循环主站和从站从站之间的定时差异并周期性地调整从循环主站接收到同步数据之间的内部状态来更精确地设置。
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公开(公告)号：US07353010B1
公开(公告)日：2008-04-01
申请号：US11021291
申请日：2004-12-22
申请人： Ning Zhang , William J. McFarland
发明人： Ning Zhang , William J. McFarland
IPC分类号： H04B7/00
CPC分类号： H03G3/3068
摘要： An automatic gain control (AGC) technique can quickly sense signal size over a large dynamic range by using a peak detector block in the analog portion of the receiver. The peak detector block can compare a received signal to predetermined thresholds (chosen to divide a potential signal range into smaller ranges). Therefore, the peak detector block can assist the automatic gain control (AGC) in quickly sizing the received signal. The AGC technique can also reduce digital filter settling time by simulating a gain change and providing this simulated value to the digital filters of the receiver. DC or spur components can be estimated prior to and after performing an analog gain change and then removed from digital signal samples. The digital signal samples sampled prior to performing the analog gain change can then be rescaled and provided to the digital filter, thereby avoiding discontinuity in a digital signal.
摘要翻译： 通过使用接收机的模拟部分中的峰值检测器块，自动增益控制（AGC）技术可以在大的动态范围内快速地感测信号尺寸。 峰值检测器块可以将接收的信号与预定的阈值进行比较（被选择以将潜在的信号范围分成更小的范围）。 因此，峰值检测器模块可以帮助自动增益控制（AGC）快速调整接收信号的大小。 AGC技术还可以通过模拟增益变化来减少数字滤波器建立时间，并将该仿真值提供给接收机的数字滤波器。 可以在执行模拟增益改变之前和之后估计DC或支线分量，然后从数字信号采样中去除。 然后可以将在执行模拟增益变化之前采样的数字信号样本重新缩放并提供给数字滤波器，从而避免数字信号的不连续性。
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公开(公告)号：US20120269170A1
公开(公告)日：2012-10-25
申请号：US13541635
申请日：2012-07-03
申请人： Qifan Chen , Ning Zhang , James Cho , William J. McFarland
发明人： Qifan Chen , Ning Zhang , James Cho , William J. McFarland
CPC分类号： H04J3/0667 , G01S5/14 , G01S13/878
摘要： A method of providing synchronization-free station locating in a wireless network is provided. In this method, an AP having a known location sends a unicast packet to the station and notes its time of departure TOD(D). The station receives the unicast packet, notes its time of arrival TOA(D), sends an acknowledgement packet to the AP, and notes its time of departure TOD(D_ACK). The AP receives the acknowledgment packet and notes its time of arrival TOA(D_ACK). Notably, a distance between the AP and the station can be accurately determined using a first difference between the TOA(D_ACK) and the TOD(D) and a second difference between the TOD(D_ACK) and the TOA(D). A plurality of such computed distances between a plurality of APs and the station can be used to determine an accurate location of the station.
摘要翻译： 提供了一种在无线网络中提供无同步电台定位的方法。 在该方法中，具有已知位置的AP向站发送单播分组，并注意其出发时间TOD（D）。 站点接收单播包，注意其到达时间TOA（D），向AP发送确认包，并记录其出发时间TOD（D_ACK）。 AP接收到确认包，并记录其到达时间TOA（D_ACK）。 值得注意的是，可以使用TOA（D_ACK）和TOD（D）之间的第一差异和TOD（D_ACK）和TOA（D）之间的第二差异来精确地确定AP与站之间的距离。 可以使用多个AP和站之间的多个这样计算的距离来确定站的精确位置。
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公开(公告)号：US08233457B1
公开(公告)日：2012-07-31
申请号：US12553757
申请日：2009-09-03
申请人： Qifan Chen , Ning Zhang , James Cho , William J. McFarland
发明人： Qifan Chen , Ning Zhang , James Cho , William J. McFarland
CPC分类号： H04J3/0667 , G01S5/14 , G01S13/878
摘要： A method of providing synchronization-free station locating in a wireless network is provided. In this method, an AP having a known location sends a unicast packet to the station and notes its time of departure TOD(D). The station receives the unicast packet, notes its time of arrival TOA(D), sends an acknowledgement packet to the AP, and notes its time of departure TOD(D_ACK). The AP receives the acknowledgment packet and notes its time of arrival TOA(D_ACK). Notably, a distance between the AP and the station can be accurately determined using a first difference between the TOA(D_ACK) and the TOD(D) and a second difference between the TOD(D_ACK) and the TOA(D). A plurality of such computed distances between a plurality of APs and the station can be used to determine an accurate location of the station.
摘要翻译： 提供了一种在无线网络中提供无同步电台定位的方法。 在该方法中，具有已知位置的AP向站发送单播分组，并注意其出发时间TOD（D）。 站点接收单播包，注意其到达时间TOA（D），向AP发送确认包，并记录其出发时间TOD（D_ACK）。 AP接收到确认包，并记录其到达时间TOA（D_ACK）。 值得注意的是，可以使用TOA（D_ACK）和TOD（D）之间的第一差异和TOD（D_ACK）和TOA（D）之间的第二差异来精确地确定AP与站之间的距离。 可以使用多个AP和站之间的多个这样计算的距离来确定站的精确位置。
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7.发明授权公开(公告)号：US07330524B2
公开(公告)日：2008-02-12
申请号：US11027280
申请日：2004-12-30
IPC分类号： H04L7/04
CPC分类号： H04L27/0014 , H04L7/04 , H04L2027/0034 , H04L2027/0065 , H04L2027/0095
摘要： Synchronization and impairment estimations can be performed jointly, thereby saving valuable time for decoding of the received packet. An initial synchronization in a TDMA system can be performed. Using this synchronization, the frequency offset choices and timing offset choices can be advantageously bounded within predetermined ranges. At this point, an algorithm can find the minimum error that gives the best frequency offset choice and timing offset choice combination over their respective ranges, together with the estimates of the signal magnitude and phase and at least one of a DC offset magnitude and phase, and a spur magnitude and phase.
摘要翻译： 可以共同执行同步和损害估计，从而节省了对接收到的分组进行解码的宝贵时间。 可以执行TDMA系统中的初始同步。 使用该同步，频率偏移选择和定时偏移选择可以有利地限制在预定范围内。 在这一点上，算法可以找到给出最佳频偏选择和定时偏移选择组合在其各自范围上的最小误差，以及信号幅度和相位的估计以及DC偏移幅度和相位中的至少一个， 和一个刺激幅度和相位。
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公开(公告)号：US08565133B2
公开(公告)日：2013-10-22
申请号：US13541635
申请日：2012-07-03
申请人： Qifan Chen , Ning Zhang , James Cho , William J. McFarland
发明人： Qifan Chen , Ning Zhang , James Cho , William J. McFarland
CPC分类号： H04J3/0667 , G01S5/14 , G01S13/878
摘要： A method of providing synchronization-free station locating in a wireless network is provided. In this method, an AP having a known location sends a unicast packet to the station and notes its time of departure TOD(D). The station receives the unicast packet, notes its time of arrival TOA(D), sends an acknowledgement packet to the AP, and notes its time of departure TOD(D_ACK). The AP receives the acknowledgment packet and notes its time of arrival TOA(D_ACK). Notably, a distance between the AP and the station can be accurately determined using a first difference between the TOA(D_ACK) and the TOD(D) and a second difference between the TOD(D_ACK) and the TOA(D). A plurality of such computed distances between a plurality of APs and the station can be used to determine an accurate location of the station.
摘要翻译： 提供了一种在无线网络中提供无同步电台定位的方法。 在该方法中，具有已知位置的AP向站发送单播分组，并注意其出发时间TOD（D）。 站点接收单播包，注意其到达时间TOA（D），向AP发送确认包，并记录其出发时间TOD（D_ACK）。 AP接收到确认包，并记录其到达时间TOA（D_ACK）。 值得注意的是，可以使用TOA（D_ACK）和TOD（D）之间的第一差异和TOD（D_ACK）和TOA（D）之间的第二差异来精确地确定AP与站之间的距离。 可以使用多个AP和站之间的多个这样计算的距离来确定站的精确位置。
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公开(公告)号：US08149880B1
公开(公告)日：2012-04-03
申请号：US11969829
申请日：2008-01-04
申请人： James Cho , William J. McFarland , Ning Zhang , Steven Kuhn
发明人： James Cho , William J. McFarland , Ning Zhang , Steven Kuhn
IPC分类号： H04J3/06
CPC分类号： H04J3/067 , H04J3/0664 , H04N21/42684 , H04N21/4305 , H04N21/43615 , H04N21/43637
摘要： A system and method for synchronously transmitting media data is described. Synchronization data may be transmitted by a cycle master for receipt by one or more cycle slaves. A cycle slave may update an internal state based on the synchronization data received from the cycle master. The cycle master may transmit media data to multiple cycle slaves. The media data output by the cycle slaves may be determined, in part, by the internal state. In one embodiment, the media data may determine which cycle slave receives particular media data.
摘要翻译： 描述用于同步传送媒体数据的系统和方法。 同步数据可以由循环主控器发送，以便由一个或多个循环从站接收。 循环从站可以基于从循环主站接收到的同步数据来更新内部状态。 循环主站可以将媒体数据传送到多个循环从站。 由循环从站输出的媒体数据可以部分地由内部状态来确定。 在一个实施例中，媒体数据可以确定哪个周期从站接收特定的媒体数据。
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10.发明授权公开(公告)号：US07123106B2
公开(公告)日：2006-10-17
申请号：US11027279
申请日：2004-12-30
申请人： Ning Zhang , William J. McFarland , Mike Galles
发明人： Ning Zhang , William J. McFarland , Mike Galles
摘要： A method and system for pulling a crystal frequency are provided, thereby allowing wireless stations to use less accurate crystal oscillators and dramatically reduce cost. A first frequency offset can be determined using a temperature-based method. This temperature-base method can include detecting a temperature substantially that of the crystal oscillator and then using that temperature to determine the first frequency offset. A second frequency offset using a closed loop frequency estimate-based method can also be determined. This frequency estimate-based method can include synchronizing the crystal frequency to a presumed, accurate frequency of a controlling device to determine the second frequency offset. Both the first and second frequency offsets can be used to pull the crystal frequency. A synthesizer can also be pulled to fine tune a carrier frequency derived from the crystal frequency.
摘要翻译： 提供了拉晶体频率的方法和系统，从而允许无线站使用较不精确的晶体振荡器并显着降低成本。 可以使用基于温度的方法来确定第一频率偏移。 该温度基方法可以包括基本上检测晶体振荡器的温度，然后使用该温度来确定第一频率偏移。 使用基于闭环频率估计的方法的第二频率偏移也可以被确定。 该基于频率估计的方法可以包括将晶体频率同步到控制装置的推定的精确频率以确定第二频率偏移。 第一和第二频率偏移都可以用于拉出晶体频率。 合成器也可以被拉动以微调从晶体频率导出的载波频率。
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