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1. 发明授权

US07099273B2 Data transport acceleration and management within a network communication system 有权
公开(公告)号：US07099273B2
公开(公告)日：2006-08-29
申请号：US10061574
申请日：2002-01-29
申请人： Sungwon Ha , Sung-wook Han , Tae-eun Kim , Vaduvur Bharghavan , Upamanyu Madhow , Kannan Ramchandran
发明人： Sungwon Ha , Sung-wook Han , Tae-eun Kim , Vaduvur Bharghavan , Upamanyu Madhow , Kannan Ramchandran
IPC分类号： H04J1/16 , H04J3/14
CPC分类号： H04L1/0018 , H04L1/0002 , H04L1/1809 , H04L1/1874 , H04L1/188 , H04L1/1887 , H04L29/06 , H04L47/10 , H04L47/193 , H04L47/20 , H04L47/28 , H04L47/283 , H04L47/37 , H04L69/16 , H04L69/161 , H04L69/162 , H04L69/163 , Y02D50/10
摘要： Improved data transport and management within a network communication system may be achieved by utilizing a transmit timer incorporated within the sender device and exploiting host-level statistics for a plurality of connections between a sender and receiver. The period of the transmit timer may be periodically adjusted based on a ratio of the smoothed round-trip time and the smoothed congestion window, thereby reducing or eliminating bursty data transmission commonly associated with conventional TCP architectures. For applications having a plurality of connections between a sender and a receiver that share a common channel, such as web applications, the congestion window and smoothed round trip time estimates for all active connections may be used to initialize new connections and allocate bandwidth among existing connections. This aspect of the present invention may reduce the destructive interference that may occur as different connections compete with one another to maximize the bandwidth of each connection without regard to other connections serving the same application. Error recovery may also be improved by incorporating a short timer and a long timer that are configured to reduce the size of the congestion window and the corresponding transmission rate in response to a second packet loss with a predefined time period in order to increase resilience to random packet loss.

2. 发明授权

US08988197B2 RFID repeater for range extension in modulated backscatter systems 有权
标题翻译： RFID中继器，用于调制后向散射系统中的范围扩展
公开(公告)号：US08988197B2
公开(公告)日：2015-03-24
申请号：US12548993
申请日：2009-08-27
申请人： Ben J. Wild , Upamanyu Madhow , Kannan Ramchandran
发明人： Ben J. Wild , Upamanyu Madhow , Kannan Ramchandran
IPC分类号： G08B13/14 , G08B13/181 , G06K13/06 , H04B3/36 , G06K7/00
CPC分类号： G06K7/0008
摘要： A backscatter tag system including a tag having tag circuitry and a reader for transmitting a command signal to the tag includes an energizer node for transmitting an energy signal to the tag to energize the tag and provide energy for operating the tag circuitry and for emitting a backscatter signal by the tag. The energizer node includes an energizer receiver for receiving the command signal from the reader to provide a received command signal and an energizer transmitter for transmitting the received command signal from the reader to the tag. The energizer node transmits both the energy signal and the received command signal to the tag. The energizer transmitter can transmit a sinusoidal signal, a frequency hopping signal, a spread spectrum signal, or a frequency shifted signal to the tag. The backscatter tag circuitry can include a processor.
摘要翻译：包括具有标签电路的标签和用于向标签发送命令信号的读取器的反向散射标签系统包括用于将能量信号发送到标签的激励器节点，以激励标签并提供用于操作标签电路的能量并且用于发射反向散射信号由标签。激励器节点包括用于从读取器接收命令信号以提供接收到的命令信号的激发器接收器和用于将接收到的命令信号从读取器发送到标签的激励器发射器。激励器节点将能量信号和接收到的命令信号都发送到标签。激发器发射器可以向标签传输正弦信号，跳频信号，扩频信号或频移信号。反向散射标签电路可以包括处理器。

3. 发明授权

US09262912B2 Localizing tagged assets using modulated backscatter 有权
公开(公告)号：US09262912B2
公开(公告)日：2016-02-16
申请号：US12072423
申请日：2008-02-25
申请人： Ben J. Wild , Artem Tkachenko , Kannan Ramchandran , Upamanyu Madhow
发明人： Ben J. Wild , Artem Tkachenko , Kannan Ramchandran , Upamanyu Madhow
IPC分类号： H04Q5/22 , G08C21/00 , G01S11/02 , G01S5/02 , G01S13/75 , G01S13/87
CPC分类号： G08C21/00 , G01S5/02 , G01S5/0252 , G01S11/02 , G01S13/756 , G01S13/876
摘要： Methods and systems for localizing an asset using the modulated backscatter from an asset tag and one or more marker tags are described. The system includes the reader, a location module and one or more marker tags. The location estimates for the asset tag are based partially on a prior knowledge of the location of each of the one or more marker tags. The location for each marker tag may be stored in a database. The location module determines a location estimate for the asset tag using the estimated parameters of the modulated backscatter signals received from one or more marker tags and from the asset tag. Using the known locations of the marker tags, a location estimate of the asset tag can be determined. The location estimate may be a relative location, an absolute location, and/or may be a zone including the marker tags. A mobile reader using the marker tags can localize asset tags throughout a large area and may, for example, take an inventory of assets throughout the large area.

4. 发明申请

US20100156610A1 RFID REPEATER FOR RANGE EXTENSION IN MODULATED BACKSCATTER SYSTEMS 有权
标题翻译：变频调速系统范围扩大的RFID发射器
公开(公告)号：US20100156610A1
公开(公告)日：2010-06-24
申请号：US12548993
申请日：2009-08-27
申请人： Ben J. Wild , Upamanyu Madhow , Kannan Ramchandran
发明人： Ben J. Wild , Upamanyu Madhow , Kannan Ramchandran
IPC分类号： H04Q5/22
CPC分类号： G06K7/0008
摘要： A backscatter tag system including a tag having tag circuitry and a reader for transmitting a command signal to the tag includes an energizer node for transmitting an energy signal to the tag to energize the tag and provide energy for operating the tag circuitry and for emitting a backscatter signal by the tag. The energizer node includes an energizer receiver for receiving the command signal from the reader to provide a received command signal and an energizer transmitter for transmitting the received command signal from the reader to the tag. The energizer node transmits both the energy signal and the received command signal to the tag. The energizer transmitter can transmit a sinusoidal signal, a frequency hopping signal, a spread spectrum signal, or a frequency shifted signal to the tag. The backscatter tag circuitry can include a processor.
摘要翻译：包括具有标签电路的标签和用于向标签发送命令信号的读取器的反向散射标签系统包括用于将能量信号发送到标签的激励器节点，以激励标签并提供用于操作标签电路的能量并且用于发射反向散射信号由标签。激励器节点包括用于从读取器接收命令信号以提供接收到的命令信号的激发器接收器和用于将接收到的命令信号从读取器发送到标签的激励器发射器。激励器节点将能量信号和接收到的命令信号都发送到标签。激发器发射器可以向标签传输正弦信号，跳频信号，扩频信号或频移信号。反向散射标签电路可以包括处理器。

5. 发明申请

US20100060424A1 Range Extension and Multiple Access in Modulated Backscatter Systems 审中-公开
标题翻译：调制后向散射系统中的范围扩展和多路访问
公开(公告)号：US20100060424A1
公开(公告)日：2010-03-11
申请号：US12406629
申请日：2009-03-18
申请人： Ben J. Wild , Upamanyu Madhow , Kannan Ramchandran , Artem Tkachenko
发明人： Ben J. Wild , Upamanyu Madhow , Kannan Ramchandran , Artem Tkachenko
IPC分类号： H04Q5/22 , H04B1/707 , H04B7/216
CPC分类号： H04B1/707 , G01S13/751 , G06K7/0008 , G06K7/10297 , G06K19/0723 , G06K19/0724 , H04B2201/70715
摘要： One or more readers transmit radio frequency (RF) beacons to be electronically reflected by tags. Data transmitted via modulated backscatter from radio frequency identification (RFID) tags is encoded so as to permit reliable demodulation of simultaneous transmissions from multiple tags. This includes the use of spreading sequences as in direct sequence spread spectrum, where the spreading sequences may be a function of the tag ID, or may be randomly chosen. Backscattered signals from multiple tags may be detected using well-known receiver techniques for code division multiple access (CDMA) systems. Readers may be equipped with transmit and/or receive antenna arrays. A receive antenna array permits a reader to estimate directions of arrival for received signals, as well as to enhance range by performing receive beamforming.
摘要翻译：一个或多个读取器传送射频（RF）信标以由标签电子反射。通过来自射频识别（RFID）标签的调制反向散射发送的数据被编码，以允许来自多个标签的同时传输的可靠解调。这包括在直接序列扩频中使用扩展序列，其中扩展序列可以是标签ID的函数，或者可以是随机选择的。可以使用用于码分多址（CDMA）系统的公知接收机技术来检测来自多个标签的后向散射信号。读取器可以配备发送和/或接收天线阵列。接收天线阵列允许读取器估计接收信号的到达方向，以及通过执行接收波束形成来增强距离。

6. 发明授权

US08446253B2 Localization using virtual antenna arrays in modulated backscatter RFID systems 失效
标题翻译：在调制反向散射RFID系统中使用虚拟天线阵列的本地化
公开(公告)号：US08446253B2
公开(公告)日：2013-05-21
申请号：US12719126
申请日：2010-03-08
申请人： Kannan Ramchandran , Ben J. Wild , Artem Tkachenco , Upamanyu Madhow
发明人： Kannan Ramchandran , Ben J. Wild , Artem Tkachenco , Upamanyu Madhow
IPC分类号： G08B5/22
CPC分类号： G01S3/74 , G01S13/756
摘要： A localization method for use in a tag communication system includes associating a supertag having a plurality of tags with an item, reading backscatter signals from the tags of the plurality of tags to provide a plurality of backscatter signals, estimating a signal parameter of the backscatter signals of the plurality of backscatter signals to provide a plurality of derived signal parameters, and localizing the item in accordance with the plurality of derived signal parameters. The backscatter signals are read by a tag reader having a single antenna and the item is localized in accordance with an antenna array technique performed upon the plurality of derived signal parameters. The backscatter signals are read with an antenna array to provide a further plurality of derived signal parameters for each tag of the plurality of tags, and the item is localized in accordance with the further pluralities of derived signal parameters.
摘要翻译：一种用于标签通信系统的定位方法包括将具有多个标签的超标与物品相关联，从多个标签的标签中读取反向散射信号以提供多个后向散射信号，估计反向散射信号的信号参数以提供多个导出的信号参数，以及根据多个导出的信号参数来定位该项目。后向散射信号由具有单个天线的标签读取器读取，并且该项目根据对多个导出的信号参数执行的天线阵列技术进行定位。用天线阵列读取反向散射信号，以便为多个标签中的每个标签提供另外多个导出的信号参数，并且根据进一步的多个导出信号参数来定位该物品。

7. 发明授权

US08217760B2 Applique nodes for performance and functionality enhancement in radio frequency identification systems 有权
标题翻译：贴片节点，用于射频识别系统中的性能和功能增强
公开(公告)号：US08217760B2
公开(公告)日：2012-07-10
申请号：US12407383
申请日：2009-03-19
申请人： Ben J. Wild , Upamanyu Madhow , Kannan Ramchandran , Robert Barton , Artem Tkachenko
发明人： Ben J. Wild , Upamanyu Madhow , Kannan Ramchandran , Robert Barton , Artem Tkachenko
IPC分类号： H04Q5/22
CPC分类号： G01S3/14 , G01S7/003 , G01S13/74 , G06K7/10178
摘要： In an RFID system with existing reader and tags communicating with each other, appliqués derive information by listening to this communication to yield significant performance benefits, while not affecting the communication between the existing nodes. For example, an appliqué capable of receiving beamforming can estimate the angle of arrival of the signal emitted by a tag, thereby providing information that can be used to localize the tag. An appliqué may be connected to an existing reader by means of an existing port, such as to an antenna port or to an Ethernet port. The information from appliqués can be integrated with that obtained from existing nodes at either the appliqués, or further up the hierarchy in middleware.
摘要翻译：在具有彼此通信的现有读取器和标签的RFID系统中，贴花通过监听该通信来获得信息，以产生显着的性能优点，同时不影响现有节点之间的通信。例如，能够接收波束形成的贴布可以估计由标签发出的信号的到达角度，从而提供可用于本地化标签的信息。贴布可以通过现有端口连接到现有的读取器，例如到天线端口或以太网端口。来自贴花的信息可以与从贴片上现有节点获得的信息集成，也可以与中间件的层次结构进一步集成。

8. 发明申请

US20100013601A1 Applique Nodes for Performance and Functionality Enhancement in Radio Frequency Identification Systems 有权
标题翻译：用于射频识别系统性能和功能增强的贴片节点
公开(公告)号：US20100013601A1
公开(公告)日：2010-01-21
申请号：US12407383
申请日：2009-03-19
申请人： Ben J. Wild , Upamanyu Madhow , Kannan Ramchandran , Robert Barton , Artem Tkachenko
发明人： Ben J. Wild , Upamanyu Madhow , Kannan Ramchandran , Robert Barton , Artem Tkachenko
IPC分类号： G06K7/01
CPC分类号： G01S3/14 , G01S7/003 , G01S13/74 , G06K7/10178
摘要： In an RFID system with existing reader and tags communicating with each other, appliqués derive information by listening to this communication to yield significant performance benefits, while not affecting the communication between the existing nodes. For example, an appliqué capable of receiving beamforming can estimate the angle of arrival of the signal emitted by a tag, thereby providing information that can be used to localize the tag. An appliqué may be connected to an existing reader by means of an existing port, such as to an antenna port or to an Ethernet port. The information from appliquéscan be integrated with that obtained from existing nodes at either the appliqués, or further up the hierarchy in middleware.
摘要翻译：在具有彼此通信的现有读取器和标签的RFID系统中，贴花通过监听该通信来获得信息，以产生显着的性能优点，同时不影响现有节点之间的通信。例如，能够接收波束形成的贴布可以估计由标签发出的信号的到达角度，从而提供可用于本地化标签的信息。贴布可以通过现有端口连接到现有的读取器，例如到天线端口或以太网端口。来自appliquéscan的信息与从现有节点获得的信息集合在贴布上，或者在中间件的层次结构中进一步集成。

9. 发明申请

US20100309017A1 Localization Using Virtual Antenna Arrays In Modulated Backscatter RFID Systems 失效
标题翻译：在调制后向散射RFID系统中使用虚拟天线阵列的本地化
公开(公告)号：US20100309017A1
公开(公告)日：2010-12-09
申请号：US12719126
申请日：2010-03-08
申请人： Kannan Ramchandran , Ben J. Wild , Artem Tkachenco , Upamanyu Madhow
发明人： Kannan Ramchandran , Ben J. Wild , Artem Tkachenco , Upamanyu Madhow
IPC分类号： G08B5/22
CPC分类号： G01S3/74 , G01S13/756
摘要： A localization method for use in a tag communication system includes associating a supertag having a plurality of tags with an item, reading backscatter signals from the tags of the plurality of tags to provide a plurality of backscatter signals, estimating a signal parameter of the backscatter signals of the plurality of backscatter signals to provide a plurality of derived signal parameters, and localizing the item in accordance with the plurality of derived signal parameters. The backscatter signals are read by a tag reader having a single antenna and the item is localized in accordance with an antenna array technique performed upon the plurality of derived signal parameters. The backscatter signals are read with an antenna array to provide a further plurality of derived signal parameters for each tag of the plurality of tags, and the item is localized in accordance with the further pluralities of derived signal parameters.
摘要翻译：一种用于标签通信系统的定位方法包括将具有多个标签的超标与物品相关联，从多个标签的标签中读取反向散射信号以提供多个后向散射信号，估计反向散射信号的信号参数以提供多个导出的信号参数，以及根据多个导出的信号参数来定位该项目。后向散射信号由具有单个天线的标签读取器读取，并且该项目根据对多个导出的信号参数执行的天线阵列技术进行定位。用天线阵列读取反向散射信号，以便为多个标签中的每个标签提供另外多个导出的信号参数，并且根据进一步的多个导出信号参数来定位该物品。

10. 发明授权

US07652577B1 Systems and methods of beamforming in radio frequency identification applications 失效
标题翻译：射频识别应用中波束成形的系统和方法
公开(公告)号：US07652577B1
公开(公告)日：2010-01-26
申请号：US11702980
申请日：2007-02-05
申请人： Upamanyu Madhow , Ben J. Wild , Kannan Ramchandran
发明人： Upamanyu Madhow , Ben J. Wild , Kannan Ramchandran
IPC分类号： G08B13/14
CPC分类号： G06K7/10346
摘要： Systems and methods for beamforming in radio frequency identification (RFID) applications are disclosed. A beamforming system uses a distributed architecture and techniques for antenna beamforming using a feedback control loop to direct radio frequency (RF) energy onto a specific region, referred to as an interrogation zone, which includes a calibration node where one or more RFID tags may be located. The distributed architecture of the beamforming system is resistant to fading and shadowing effects, providing accurate RFID reader operation even in environments with multi-path reflections or environmental changes, such as people moving around or changes in the location of equipment.
摘要翻译：公开了用于射频识别（RFID）应用中的波束成形的系统和方法。波束成形系统使用分布式架构和技术用于天线波束成形，使用反馈控制回路将射频（RF）能量引导到称为询问区的特定区域，该特定区域包括校准节点，其中一个或多个RFID标签可以是位于。波束成形系统的分布式架构能够抵抗衰落和阴影效应，即使在具有多路径反射或环境变化的环境（例如人员移动或设备位置变化）的环境中也能提供精确的RFID读取器操作。

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