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21. 发明申请

US20130070607A1 WIFI Distance Measurement Using Location Packets 有权
标题翻译： WIFI距离测量使用位置包
公开(公告)号：US20130070607A1
公开(公告)日：2013-03-21
申请号：US13239332
申请日：2011-09-21
申请人： Qinfang Sun , Hao Zhou , Hao-Jen Cheng
发明人： Qinfang Sun , Hao Zhou , Hao-Jen Cheng
IPC分类号： H04W24/00
CPC分类号： G01S5/0205 , G01S5/14 , G01S13/79
摘要： A method of determining a distance between a first wireless device and a second wireless device is provided. In this method, a location symbol can be generated by filtering and modulating a pseudorandom (PRN) code. The location symbol can be provided in a data field of a legacy wireless packet to form a first location packet. The first location packet can be transmitted from the first wireless device to the second wireless device. A second location packet can be transmitted from the second wireless device to the first wireless device, wherein the second location packet is substantially identical to the first location packet. An effective roundtrip time between the first and second wireless devices can be determined based on the first and second location packets. The distance between the first and second wireless devices can be computed using this roundtrip time.
摘要翻译：提供了一种确定第一无线设备和第二无线设备之间的距离的方法。在该方法中，可以通过对伪随机（PRN）码进行滤波和调制来产生位置符号。可以在传统无线分组的数据字段中提供位置符号以形成第一位置分组。第一位置分组可以从第一无线设备发送到第二无线设备。第二位置分组可以从第二无线设备发送到第一无线设备，其中第二位置分组与第一位置分组基本相同。可以基于第一和第二位置分组来确定第一和第二无线设备之间的有效往返时间。可以使用该往返时间来计算第一和第二无线设备之间的距离。

22. 发明申请

US20120121046A1 Repetition Coding For A Wireless System 有权
标题翻译：无线系统的重复编码
公开(公告)号：US20120121046A1
公开(公告)日：2012-05-17
申请号：US13356580
申请日：2012-01-23
申请人： Won-Joon Choi , Qinfang Sun , Jeffrey M. Gilbert
发明人： Won-Joon Choi , Qinfang Sun , Jeffrey M. Gilbert
IPC分类号： H04L27/06 , H04L27/00
CPC分类号： H04L1/08 , H04L1/0071
摘要： A system and method are disclosed for transmitting data over a wireless channel. In some embodiments, transmitting data includes receiving convolutionally encoded data and enhancing the transmission of the data by further repetition encoding the data.
摘要翻译：公开了一种通过无线信道发送数据的系统和方法。在一些实施例中，发送数据包括接收卷积编码的数据，并通过进一步重复编码数据来增强数据的传输。

23. 发明授权

US07800531B2 High precision positioning system 有权
标题翻译：高精度定位系统
公开(公告)号：US07800531B2
公开(公告)日：2010-09-21
申请号：US12043853
申请日：2008-03-06
申请人： Yi-Hsiu Wang , Qinfang Sun
发明人： Yi-Hsiu Wang , Qinfang Sun
IPC分类号： G01S19/42 , G01S19/31
CPC分类号： G01S19/46
摘要： A method for determining a position uses an access point array, a reference station, a location server and a client terminal. The reference station may include a GPS receiver to acquire and track GPS satellites. GPS data may be provided to the location server. The access point array may be configured to minimize interference and may be coupled by a network to the location server. The client terminal may include a GPS receiver. A frequency offset for the client terminal may be determined by examining a frequency offset of the reference station and relative offset frequencies of the access points. This frequency offset may advantageously increase the sensitivity of the client terminal to GPS signals. The client terminal may provide GPS data to the location server, which server may determine the position of the client terminal based on data from the client terminal and the reference station.
摘要翻译：用于确定位置的方法使用接入点阵列，参考站，位置服务器和客户终端。参考站可以包括用于获取和跟踪GPS卫星的GPS接收机。 GPS数据可以被提供给位置服务器。接入点阵列可以被配置为最小化干扰并且可以由网络耦合到位置服务器。客户终端可以包括GPS接收机。可以通过检查参考站的频率偏移和接入点的相对偏移频率来确定客户终端的频率偏移。该频率偏移可以有利地增加客户终端对GPS信号的灵敏度。客户终端可以向位置服务器提供GPS数据，该服务器可以基于来自客户终端和参考站的数据来确定客户终端的位置。

24. 发明授权

US07705778B2 Satellite navigation receiver having configurable acquisition and tracking engines 有权
标题翻译：具有可配置采集和跟踪引擎的卫星导航接收机
公开(公告)号：US07705778B2
公开(公告)日：2010-04-27
申请号：US12261896
申请日：2008-10-30
申请人： Qinfang Sun , Wen-Chang Yeh
发明人： Qinfang Sun , Wen-Chang Yeh
IPC分类号： G01S1/00
CPC分类号： G01S19/24 , G01S19/30 , G01S19/36 , G01S19/37
摘要： A satellite navigation receiver having a flexible acquisition and tracking engine architecture. The flexible acquisition engine has a reconfigurable delay line that can be used either as a single entity or divided into different sections. Consequently, it can be configured to search different satellite vehicles, a single Doppler frequency, and full CA code in parallel. When configuring the delay line into different sections, each section is used to search a partial CA code. In this configuration, multiple Doppler mode, multiple satellite vehicles, multiple Doppler frequencies, and partial CA code can be searched in parallel. Furthermore, the different sections of the CA code can be time-multiplexed into a correlator, which can then be over clocked to achieve full CA code correlation. The flexible tracking engine includes a number of parallel tracking channels, whereby each individual channel has a number of taps or fingers, which can be used to lock onto different delays. During tracking, one of the taps can be used to lock on to the center of the peak. This leaves the other taps free to be used to perform other functions, such as determining the shape of the peak, detecting earlier arrivals for line of sight component, and obtaining an estimate of the noise floor. The flexible tracking engine is configurable to help acquisition functions, such as fine acquisition, false trigger detection, and/or fast reacquisition.
摘要翻译：具有灵活的采集跟踪引擎结构的卫星导航接收机。灵活的采集引擎具有可重新配置的延迟线，可以将其用作单个实体或分为不同的部分。因此，它可以被配置为并行搜索不同的卫星车辆，单个多普勒频率和完整的CA码。当将延迟线配置到不同的部分时，每个部分用于搜索部分CA代码。在这种配置中，可以并行地搜索多重多普勒模式，多个卫星载波，多重多普勒频率和部分CA码。此外，CA代码的不同部分可以被时分复用到相关器中，然后可以超时钟以实现完全CA代码相关。柔性跟踪引擎包括多个并行跟踪通道，由此每个单独的通道具有多个抽头或手指，可用于锁定到不同的延迟。在跟踪期间，可以使用其中一个水龙头锁定到峰顶的中心。这使得另一个水龙头可以自由地用于执行其他功能，例如确定峰值的形状，检测视线分量的较早到达，以及获得噪声基底的估计。灵活的跟踪引擎可配置为帮助采集功能，如精细采集，错误触发检测和/或快速重新采集。

25. 发明申请

US20100014504A1 Multiple-Input Multiple-Output System And Method 有权
标题翻译：多输入多输出系统及方法
公开(公告)号：US20100014504A1
公开(公告)日：2010-01-21
申请号：US12569852
申请日：2009-09-29
申请人： Qinfang Sun , Won-Joon Choi , Jeffrey M. Gilbert , Ardavan Maleki Tehrani
发明人： Qinfang Sun , Won-Joon Choi , Jeffrey M. Gilbert , Ardavan Maleki Tehrani
IPC分类号： H04J3/00 , H04L27/28 , H04L27/06 , H04L27/08 , H04B7/10
CPC分类号： H04B7/0421 , H04B7/0413 , H04B7/0613 , H04B7/0684 , H04L1/0041 , H04L1/0054 , H04L1/0061 , H04L1/06 , H04L1/0656 , H04L1/1819 , H04L1/1829 , H04L5/0048 , H04L25/0204 , H04L25/0226 , H04L27/0014 , H04L2025/03426
摘要： A multiple-input multiple-output (MIMO) system can transmit on multiple antennas simultaneously and receive on multiple antennas simultaneously. Unfortunately, because a legacy 802.11a/g device is not able to decode multiple data streams, such a legacy device may “stomp” on a MIMO packet by transmitting before the transmission of the MIMO packet is complete. Therefore, MIMO systems and methods are provided herein to allow legacy devices to decode the length of a MIMO packet and to restrain from transmitting during that period. These MIMO systems and methods are optimized for efficient transmission of MIMO packets.
摘要翻译：多输入多输出（MIMO）系统可以同时在多个天线上进行发射并同时在多个天线上进行接收。不幸的是，由于遗留802.11a / g设备不能解码多个数据流，所以这样的传统设备可能在完成MIMO分组的传输之前通过发送来“踩踏”MIMO分组。因此，本文提供MIMO系统和方法，以允许传统设备对MIMO分组的长度进行解码并且在该时间段内抑制发射。这些MIMO系统和方法被优化用于MIMO分组的有效传输。

26. 发明申请

US20090079627A1 High Sensitivity GPS Receiver 有权
标题翻译：高灵敏度GPS接收机
公开(公告)号：US20090079627A1
公开(公告)日：2009-03-26
申请号：US12145918
申请日：2008-06-25
申请人： Qinfang Sun , Wen-Chang Yeh , Ho-Chung Chen
发明人： Qinfang Sun , Wen-Chang Yeh , Ho-Chung Chen
IPC分类号： G01S1/00
CPC分类号： H04L7/0016 , G01S19/24 , G01S19/30 , G01S19/36 , G01S19/37
摘要： A high sensitivity GPS receiver includes an acquisition engine and a tracking engine. The acquisition engine processes GPS satellite data at data rate that is substantially equal to twice the coarse acquisition (CA) code chip rate. This data rate advantageously enables the acquisition engine to process GPS satellite data with relatively less hardware area than traditional GPS acquisition approaches. In one embodiment, the high efficiency acquisition engine may be over-clocked, thereby allowing different phases of a CA code to be correlated quickly. The tracking engine can advantageously processes GPS satellite data at a data rate that does not have an integer relationship to the CA code chip rate.
摘要翻译：高灵敏度GPS接收机包括采集引擎和跟踪引擎。采集引擎以基本上等于粗略采集（CA）码片速率的两倍的数据速率处理GPS卫星数据。该数据速率有利地使得采集引擎能够以比传统的GPS采集方法更少的硬件面积来处理GPS卫星数据。在一个实施例中，高效率采集引擎可以被超频，从而允许CA代码的不同阶段快速相关。跟踪引擎可以以不与CA码片速率的整数关系的数据速率有利地处理GPS卫星数据。

27. 发明申请

US20090010365A1 Repetition coding for a wireless system 审中-公开
标题翻译：无线系统的重复编码
公开(公告)号：US20090010365A1
公开(公告)日：2009-01-08
申请号：US12217300
申请日：2008-07-01
申请人： Won-Joon Choi , Qinfang Sun , Jeffrey M. Gilbert
发明人： Won-Joon Choi , Qinfang Sun , Jeffrey M. Gilbert
IPC分类号： H04L27/06
CPC分类号： H04L1/08 , H04L1/0071
摘要： A system and method are disclosed for transmitting data over a wireless channel. In some embodiments, transmitting data includes receiving convolutionally encoded data and enhancing the transmission of the data by further repetition encoding the data.
摘要翻译：公开了一种通过无线信道发送数据的系统和方法。在一些实施例中，发送数据包括接收卷积编码的数据，并通过进一步重复编码数据来增强数据的传输。

28. 发明申请

US20050226341A1 Decision feedback channel estimation and pilot tracking for OFDM systems 有权
标题翻译： OFDM系统的决策反馈信道估计和导频跟踪
公开(公告)号：US20050226341A1
公开(公告)日：2005-10-13
申请号：US11150619
申请日：2005-06-10
申请人： Qinfang Sun , Won-Joon Choi , Jeffrey Gilbert , Ning Zhang , Yi-Hsiu Wang , Tao-Fei Ng
发明人： Qinfang Sun , Won-Joon Choi , Jeffrey Gilbert , Ning Zhang , Yi-Hsiu Wang , Tao-Fei Ng
IPC分类号： H04L25/02 , H04L25/03 , H04L27/26 , H04L27/28
CPC分类号： H04L25/022 , H04L25/0236 , H04L27/2647 , H04L2025/03522
摘要： Current OFDM systems use a limited number of symbols and/or sub-channels to provide approximations for channel estimations and pilot tracking, i.e. phase estimations. For example, two training symbols in the preamble of a data packet are used to provide channel estimation. Four of the fifty-four sub-channels are reserved for providing phase estimation. However, noise and other imperfections can cause errors in both of these estimations, thereby degrading system performance. Advantageously, decision feedback mechanisms can be provided to significantly improve channel estimation and pilot tracking in OFDM systems. The decision feedback mechanisms can use data symbols in the data packet to improve channel estimation as well as data sub-channels to improve pilot tracking.
摘要翻译：当前OFDM系统使用有限数量的符号和/或子信道来提供用于信道估计和导频跟踪（即相位估计）的近似。例如，使用数据分组的前导码中的两个训练符号来提供信道估计。五十四个子通道中的四个保留用于提供相位估计。然而，噪声和其他缺陷可能会导致这两种估计中的错误，从而降低系统性能。有利地，可以提供决策反馈机制以显着地改善OFDM系统中的信道估计和导频跟踪。决策反馈机制可以使用数据分组中的数据符号来改进信道估计以及数据子信道，以改进导频跟踪。

29. 发明授权

US08824606B2 Multiple correlators for communication device detection 有权
标题翻译：用于通信设备检测的多个相关器
公开(公告)号：US08824606B2
公开(公告)日：2014-09-02
申请号：US13465613
申请日：2012-05-07
申请人： Hao-Jen Cheng , Qinfang Sun
发明人： Hao-Jen Cheng , Qinfang Sun
IPC分类号： H03D1/00
CPC分类号： H04L27/0014 , H04L27/16 , H04L27/2331 , H04L2027/0034 , H04L2027/0095
摘要： A receiver unit of a communication device can employ multiple correlators for decoding the access address of a packet received from another communication device. A dynamically determined primary frequency offset is applied to a phase difference signal that is determined from an RF signal that comprises the packet. For each of a plurality of access address decoding chains of the receiver unit, a secondary frequency offset associated with the access address decoding chain is applied to the phase difference signal, the phase difference signal is correlated with a predetermined access address of the communication device, and a resultant correlation output is compared against a correlation threshold. One of the access address decoding chains that generated the correlation output that is greater than the correlation threshold is selected and the packet is demodulated based, at least in part, on the phase difference signal corresponding to the selected access address decoding chain.
摘要翻译：通信设备的接收机单元可以使用多个相关器来解码从另一通信设备接收的分组的接入地址。将动态确定的主频偏移施加到从包括分组的RF信号确定的相位差信号。对于接收机单元的多个接入地址解码链中的每一个，与接入地址解码链相关联的次频偏移被施加到相位差信号，相位差信号与通信设备的预定访问地址相关，并将合成的相关输出与相关阈值进行比较。选择生成大于相关阈值的相关输出的访问地址解码链之一，并且至少部分地基于与所选择的访问地址解码链相对应的相位差信号来解调分组。

30. 发明授权

US08675561B2 WiFi distance measurement using location packets 有权
标题翻译：使用位置数据包进行WiFi距离测量
公开(公告)号：US08675561B2
公开(公告)日：2014-03-18
申请号：US13239332
申请日：2011-09-21
申请人： Qinfang Sun , Hao Zhou , Hao-Jen Cheng
发明人： Qinfang Sun , Hao Zhou , Hao-Jen Cheng
IPC分类号： H04Q7/00
CPC分类号： G01S5/0205 , G01S5/14 , G01S13/79
摘要： A method of determining a distance between a first wireless device and a second wireless device is provided. In this method, a location symbol can be generated by filtering and modulating a pseudorandom (PRN) code. The location symbol can be provided in a data field of a legacy wireless packet to form a first location packet. The first location packet can be transmitted from the first wireless device to the second wireless device. A second location packet can be transmitted from the second wireless device to the first wireless device, wherein the second location packet is substantially identical to the first location packet. An effective roundtrip time between the first and second wireless devices can be determined based on the first and second location packets. The distance between the first and second wireless devices can be computed using this roundtrip time.
摘要翻译：提供了一种确定第一无线设备和第二无线设备之间的距离的方法。在该方法中，可以通过对伪随机（PRN）码进行滤波和调制来产生位置符号。可以在传统无线分组的数据字段中提供位置符号以形成第一位置分组。第一位置分组可以从第一无线设备发送到第二无线设备。第二位置分组可以从第二无线设备发送到第一无线设备，其中第二位置分组基本上与第一位置分组相同。可以基于第一和第二位置分组来确定第一和第二无线设备之间的有效往返时间。可以使用该往返时间来计算第一和第二无线设备之间的距离。

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