公开(公告)号：US5013944A

公开(公告)日：1991-05-07

申请号：US340999

申请日：1989-04-20

申请人： Jeffrey H. Fischer ,  Lawrence J. Grasso ,  Dale E. Hoffman ,  Daniel E. Skooglund ,  Diane K. Young

发明人： Jeffrey H. Fischer ,  Lawrence J. Grasso ,  Dale E. Hoffman ,  Daniel E. Skooglund ,  Diane K. Young

IPC分类号： H03K5/00 ,  H03K5/13 ,  H03K5/135

CPC分类号： H03K5/131 ,  H03K5/135 ,  H03K2005/00097 ,  H03K2005/00104 ,  H03K2005/00247 ,  H03K2005/00254

摘要： A method of operating a delay circuit to impose a selected delay on an electronic signal the delay circuit comprising a plurality of delay stages and means for directing the electronic signal through selected ones of the delay stages, the method comprising the steps of: measuring the actual signal delay through each of the delay stages; and selecting, based on the signal delays obtained in the measuring step, the delay stages through which the electronic signal is directed.

公开(公告)号：US07817014B2

公开(公告)日：2010-10-19

申请号：US11194127

申请日：2005-07-29

申请人： Pattabhiraman Krishna ,  Jeffrey H. Fischer ,  David J. Husak ,  Robert A. Stephenson

发明人： Pattabhiraman Krishna ,  Jeffrey H. Fischer ,  David J. Husak ,  Robert A. Stephenson

IPC分类号： H04Q5/22

CPC分类号： G06K17/0029 ,  G01S5/0252 ,  G01S5/06 ,  G06K7/0008 ,  G06K7/10356 ,  G06K2017/0045 ,  G06K2017/0048 ,  G06K2017/0051

摘要： A system and method of scheduling RFID tag interrogations by a plurality of RFID readers so as to mitigate the effects of interference within an RFID environment in which the readers are deployed, and to enhance the efficiency and reliability of the overall RFID system. The system includes a plurality of RFID receivers for receiving RFID tag data, a plurality of RFID tag interrogators for transmitting RF interrogation signals for interrogating RFID tags, and a controller for providing to at least one interrogator, at least one receiver, and at least one tag, a parameter associated with operational characteristics of the interrogator, the receiver, and the tag, respectively. The interrogator, the receiver, and the tag are operative, in response to receipt of the respective parameter, to modify its operational characteristics in accordance with the respective parameter, thereby avoiding interference at the receivers and the tags.

摘要翻译： 一种通过多个RFID读取器调度RFID标签询问的系统和方法，以便减轻在其中部署读取器的RFID环境中的干扰的影响，并且提高整个RFID系统的效率和可靠性。 该系统包括用于接收RFID标签数据的多个RFID接收器，用于发送用于询问RFID标签的RF询问信号的多个RFID标签询问器，以及用于向至少一个询问器提供至少一个接收器的控制器，以及至少一个接收器 标签，分别与询问器，接收器和标签的操作特性相关联的参数。 响应于相应参数的接收，询问器，接收器和标签可操作，以根据相应的参数修改其操作特性，从而避免对接收器和标签的干扰。

公开(公告)号：US07567179B2

公开(公告)日：2009-07-28

申请号：US11581788

申请日：2006-10-16

申请人： Robert A. Stephensen ,  Michael Grady ,  Scott Barvick ,  David J. Husak ,  Lin Zhou ,  Nirav R. Shah ,  Pattabhiraman Krishna ,  Jeffrey H. Fischer ,  Chilton L. Cabot

发明人： Robert A. Stephensen ,  Michael Grady ,  Scott Barvick ,  David J. Husak ,  Lin Zhou ,  Nirav R. Shah ,  Pattabhiraman Krishna ,  Jeffrey H. Fischer ,  Chilton L. Cabot

IPC分类号： G08B13/141

CPC分类号： H04W16/18 ,  H04L67/18 ,  H04W4/02 ,  H04W84/18

摘要： A system and method that facilitates the configuration and control of components of an RFID system, taking into account how the RFID system components are associated with one or more physical locations within an environment in which the RFID system is deployed. A user provides information specifying associations between the system components and the physical locations within the environment to obtain visual representations of configuration data generated therefrom with reference to a facility view, an RF coverage view, and a location view of the data. The facility view serves as a reference plane for placement and orientation of antennas associated with RFID readers, location benchmark tags, and the physical locations of interest. After each antenna is placed and oriented on the facility view, an estimate of the size and shape of the RF interrogation zone of each antenna is computed, and representations of the RF interrogation zones are provided on the facility view to obtain the RF coverage view of the data. Next, the user provides information specifying the physical locations of interest to obtain the location view of the data. A composite of the facility view, the coverage view, and the location view is then generated to obtain an enhanced visual understanding of how the system components and the physical locations exist within the system environment, and how the components and locations are associated with one another.

摘要翻译： 考虑到RFID系统组件如何与在其中部署RFID系统的环境中的一个或多个物理位置相关联，便于对RFID系统的组件进行配置和控制的系统和方法。 用户提供指定系统组件与环境内的物理位置之间的关联的信息，以参考参考设施视图，RF覆盖视图和数据的位置视图从其生成的配置数据的视觉表示。 设备视图用作与RFID读取器，位置基准标签和感兴趣的物理位置相关联的天线的放置和定向的参考平面。 在每个天线在设施视图上放置和定向之后，计算每个天线的RF询问区的大小和形状的估计，并且在设施视图上提供RF询问区的表示以获得RF覆盖视图 数据。 接下来，用户提供指定感兴趣的物理位置以获得数据的位置视图的信息。 然后生成设施视图，覆盖视图和位置视图的组合，以获得对系统组件和物理位置如何存在于系统环境中以及组件和位置如何彼此关联的增强的视觉理解 。

公开(公告)号：US6067313A

公开(公告)日：2000-05-23

申请号：US102416

申请日：1998-06-22

申请人： John H. Cafarella ,  Jeffrey H. Fischer

发明人： John H. Cafarella ,  Jeffrey H. Fischer

IPC分类号： H04B1/707 ,  H04J11/00 ,  H04J13/00 ,  H04J13/12 ,  H04J13/18 ,  H04L23/02 ,  H04B1/69

CPC分类号： H04L23/02 ,  H04J13/004 ,  H04J13/12 ,  H04J13/18

摘要： A data communications system for conveying a series of input data symbols includes a transmitter subsystem and a receiver subsystem. The transmitter subsystem generates a series of composite waveforms corresponding to a series of input data symbols by selecting from a set of mutually orthogonal component waveforms, then combines contemporaneous portions of at least two of the component waveforms so as to form a composite waveform which is unique to the data symbol. The transmit subsystem uses the composite waveform to modulate a carrier signal and transmits the carrier signal over a communications channel. The receiver subsystem receives the carrier signal and recovers the composite waveform from the carrier signal. The receiver subsystem identifies the data symbol by, at least in part, decompositioning the composite waveforms into their constituent component waveforms so as to identify which composite waveforms have been transmitted.

摘要翻译： 用于传送一系列输入数据符号的数据通信系统包括发射机子系统和接收机子系统。 发射机子系统通过从一组相互正交的分量波形中选择，产生一系列对应于一系列输入数据符号的复合波形，然后组合至少两个分量波形的同时部分，以形成独特的复合波形 到数据符号。 传输子系统使用复合波形来调制载波信号，并通过通信信道发送载波信号。 接收机子系统接收载波信号，并从载波信号中恢复复合波形。 接收器子系统通过至少部分地将复合波形分解成其组成分量波形来识别数据符号，以便识别哪些复合波形已被发送。

公开(公告)号：US20090256683A1

公开(公告)日：2009-10-15

申请号：US12488863

申请日：2009-06-22

申请人： Robert A. Stephenson ,  Michael Grady ,  Scott Barvick ,  David J. Husak ,  Lin Zhou ,  Nirav R. Shah ,  Pattabhiraman Krishna ,  Jeffrey H. Fischer ,  Chilton L. Cabot

发明人： Robert A. Stephenson ,  Michael Grady ,  Scott Barvick ,  David J. Husak ,  Lin Zhou ,  Nirav R. Shah ,  Pattabhiraman Krishna ,  Jeffrey H. Fischer ,  Chilton L. Cabot

IPC分类号： H04Q5/22

CPC分类号： H04W16/18 ,  H04L67/18 ,  H04W84/18

摘要： A system and method that facilitates the configuration and control of components of a radio frequency identification (RFID) system, taking into account how the RFID system components are associated with one or more physical locations within an environment in which the RFID system is deployed. The RFID system can be controlled by obtaining a representation of the physical space. Next, at least one region of interest is specified in the representation of the physical space. An interrogation zone is then specified in the representation of the physical space, in which the interrogation zone corresponds to the data reader. Next, at least one overlap region of the interrogation zone and the region of interest is specified. Information is then stored, including the representation, and the interest region, the interrogation zone, and/or the overlap region. Operation of the data reader is controlled as a function of the stored information.

摘要翻译： 考虑到RFID系统组件如何与RFID系统部署的环境中的一个或多个物理位置相关联，便于对射频识别（RFID）系统的组件进行配置和控制的系统和方法。 可以通过获得物理空间的表示来控制RFID系统。 接下来，在物理空间的表示中指定至少一个感兴趣区域。 然后在物理空间的表示中指定询问区，其中询问区对应于数据读取器。 接下来，指定询问区域和感兴趣区域的至少一个重叠区域。 然后存储信息，包括表示，兴趣区域，询问区域和/或重叠区域。 作为存储信息的函数控制数据读取器的操作。

公开(公告)号：US07073112B2

公开(公告)日：2006-07-04

申请号：US10681856

申请日：2003-10-08

申请人： Chiaming Chai ,  Jeffrey H. Fischer ,  Michael R. Ouellette ,  Michael H. Wood

发明人： Chiaming Chai ,  Jeffrey H. Fischer ,  Michael R. Ouellette ,  Michael H. Wood

IPC分类号： G01R31/28

CPC分类号： G01R31/3187 ,  G01R31/3193 ,  G11C29/26 ,  G11C2029/1802

摘要： An apparatus that improves Built-In-Self-Test (BIST) flexibility. A compilable address magnitude comparator facilitates BIST testing of different size memory arrays without requiring customization of the BIST controller. The compilable address magnitude comparator is compiled within the compilable memory arrays of the ASIC to allow a single BIST controller to test multiple sizes of memory arrays without requiring that the BIST controller be compilable. The compilable magnitude address comparator overrides the self-test signal from the BIST when the BIST attempts to test addresses not existing in the memory. The BIST is prevented from writing to addresses that do not exist, and does not receive error signals from those addresses. The BIST controller is able to test memory arrays without regard for their particular size. A single BIST controller can be used to test multiple memory arrays of different sizes in the ASIC, reducing device complexity.

摘要翻译： 一种改进内置自检（BIST）灵活性的设备。 可编译的地址幅度比较器便于对不同大小的存储器阵列进行BIST测试，而无需定制BIST控制器。 可编译地址幅度比较器在ASIC的可编译存储器阵列中编译，以允许单个BIST控制器测试多个大小的存储器阵列，而不需要BIST控制器可编译。 当BIST尝试测试存储器中不存在的地址时，可编译幅度地址比较器会覆盖BIST的自检信号。 BIST被阻止写入不存在的地址，并且不会从这些地址接收到错误信号。 BIST控制器能够测试存储器阵列，而不考虑其特定大小。 单个BIST控制器可用于在ASIC中测试不同大小的多个存储器阵列，从而降低器件的复杂性。

公开(公告)号：US5809060A

公开(公告)日：1998-09-15

申请号：US369778

申请日：1994-12-30

申请人： John H. Cafarella ,  Jeffrey H. Fischer

发明人： John H. Cafarella ,  Jeffrey H. Fischer

IPC分类号： H04B1/707 ,  H04B1/711 ,  H04J11/00 ,  H04J13/00 ,  H04L12/28

CPC分类号： H04B1/711 ,  H04B1/707 ,  H04J13/0074 ,  H04L27/205 ,  H04B2201/709709 ,  H04L1/0057 ,  H04W28/06 ,  H04W84/12

摘要： An apparatus and method for communicating data between at least two data devices, suitable for use as a wireless local-area network, that provides robust data communication via a radio communications channel corrupted by multipath interference, particularly at high data rates. A preferred embodiment of the invention represents data as a sequence of Walsh-function waveforms encoded by pseudo-noise direct-sequence spread-spectrum modulation. Walsh-function-encoding of the data provides a long symbol duration, thereby allowing the spread-spectrum modulation to provide processing gain sufficient to substantially overcome multipath interference, while providing a high data rate. In another preferred embodiment, Walsh-function modulation is supplemented with various forms of phase modulation, such as coherent PSK for bi-orthogonal signalling, and DPSK between orthogonal symbols for noncoherent bi-orthogonal signalling, thereby further increasing data rate without reducing processing gain. In another preferred embodiment, Walsh-function modulation is supplemented with spectral shaping to allow increased bandwidth occupancy, thereby further increasing the processing gain without sacrificing data rate.