公开(公告)号：US20060236203A1

公开(公告)日：2006-10-19

申请号：US11388235

申请日：2006-03-22

申请人： Christopher Diorio ,  Seth Bridges ,  Aanand Esterberg ,  William Colleran

发明人： Christopher Diorio ,  Seth Bridges ,  Aanand Esterberg ,  William Colleran

IPC分类号： H03M13/00

CPC分类号： H03M13/09 ,  G06K7/0008 ,  G06K17/00

摘要： RFID systems, devices, software and methods are adapted for receiving from an RFID tag at least waves that communicate at least a first version of its code. An output tag code is output that is the same as the first version, if a fidelity criterion is met regarding the first version. If not met, the output tag code is instead a final version that is reconstructed from the first version, and also from any additionally optionally subsequently received versions. In some embodiments, an error recovery block includes a subcomponent fidelity criterion checking block that can determine whether the fidelity criterion is met, and a code reconstruction block that can derive the final version.

摘要翻译： RFID系统，设备，软件和方法适于从RFID标签接收至少传达其代码的第一版本的波。 如果满足关于第一版本的保真度标准，输出与第一版本相同的输出标签代码。 如果不满足，则输出标签代码是从第一版本重建的最终版本，也可以是任何另外可选地随后接收的版本。 在一些实施例中，错误恢复块包括可以确定是否满足保真度准则的子组件保真度准则检查块，以及可以导出最终版本的代码重建块。

公开(公告)号：US20070177738A1

公开(公告)日：2007-08-02

申请号：US11356885

申请日：2006-02-17

申请人： Christopher Diorio ,  Aanand Esterberg ,  Todd Humes

发明人： Christopher Diorio ,  Aanand Esterberg ,  Todd Humes

IPC分类号： H04K1/00

CPC分类号： G06K7/0008 ,  G06K7/10257 ,  H04L9/0656 ,  H04L2209/601 ,  H04L2209/805

摘要： Methods and apparatus provide secure two-way (reader-to-tag and tag-to-reader) RFID communications. According to one aspect, a tag receives a noise-encrypted RF carrier signal from a reader and backscatter modulates it with tag information. Eavesdroppers cannot extract the tag information from the backscattered signal because it is masked by the noise encryption.

摘要翻译： 方法和设备提供安全的双向（读写器到标签和标签到阅读器）RFID通信。 根据一个方面，标签从读取器接收噪声加密的RF载波信号，并用标签信息对后向散射进行调制。 窃听者无法从反向散射信号中提取标签信息，因为它被噪声加密掩蔽。

公开(公告)号：US20070296590A1

公开(公告)日：2007-12-27

申请号：US11849804

申请日：2007-09-04

申请人： Christopher Diorio ,  Aanand Esterberg ,  Thomas Anderl ,  Scott Cooper

发明人： Christopher Diorio ,  Aanand Esterberg ,  Thomas Anderl ,  Scott Cooper

IPC分类号： G08B13/14

CPC分类号： G06K7/0008 ,  G06K7/10069 ,  G06K7/10198 ,  G06K19/0723

摘要： RFID readers, systems, and methods are provided for overcoming the effects of RF interference. While a system is communicating in a channel, RF interference is monitored. If it is low, then the next channel to be hopped onto is chosen in an unbiased manner. But if interference is high, then the next channel to be hopped onto is chosen in a biased manner that disfavors at least one channel over another, in view of the detected interference. The choice of the next channel can thus result in diminishing communication in channels with a lot of RF interference.

摘要翻译： 提供RFID读取器，系统和方法来克服RF干扰的影响。 当系统正在通道中进行通信时，会监视射频干扰。 如果它是低的，那么要跳过的下一个通道是以不偏不倚的方式选择的。 但是如果干扰较高，则考虑到检测到的干扰，要跳过的下一个信道被选择为以偏置的方式使得至少一个信道相对于另一信道不利。 因此，下一个通道的选择可以导致具有大量RF干扰的通道中的通信减少。

公开(公告)号：US20070109129A1

公开(公告)日：2007-05-17

申请号：US11622092

申请日：2007-01-11

申请人： Kurt Sundstrom ,  Scott Cooper ,  Amir Sarajedini ,  Aanand Esterberg ,  Todd Humes ,  Christopher Diorio

发明人： Kurt Sundstrom ,  Scott Cooper ,  Amir Sarajedini ,  Aanand Esterberg ,  Todd Humes ,  Christopher Diorio

IPC分类号： G08B13/14

CPC分类号： G06K7/0008

摘要： RFID tags are commanded to generate a pilot tone in their backscatter. When the backscattered pilot tone is received in the reader, the pilot tone is used to estimate the tag period/frequency. Then, the estimate is used to seed and lock a symbol timing recovery loop, which provides a detected signal to one or more correlators for detecting the tag preamble. A delayed version of the received tag signal is compared against a baseline signal threshold established from the received signal to detect the pilot tone.

摘要翻译： 命令RFID标签在其反向散射中产生导频音。 当在读取器中接收到反向散射导频时，使用导频音来估计标签周期/频率。 然后，估计用于对符号定时恢复循环进行种子和锁定，该循环向一个或多个相关器提供检测信号以检测标签前导码。 将接收到的标签信号的延迟版本与从接收信号建立的基线信号阈值进行比较，以检测导频音。

公开(公告)号：US20050058292A1

公开(公告)日：2005-03-17

申请号：US10660829

申请日：2003-09-11

申请人： Christopher Diorio ,  Aanand Esterberg ,  Todd Humes

发明人： Christopher Diorio ,  Aanand Esterberg ,  Todd Humes

IPC分类号： G06K7/00 ,  G06K17/00 ,  H04K1/00

CPC分类号： G06K7/0008 ,  G06K7/10257 ,  H04L9/0656 ,  H04L2209/601 ,  H04L2209/805

摘要： Methods and apparatus for providing secure two-way (reader-to-tag and tag-to-reader) RFID communications. According to one aspect of the invention, a tag receives a noise-encrypted RF carrier signal from a reader and backscatter modulates it with tag information. Eavesdroppers cannot extract the tag information from the backscattered signal because it is masked by the noise encryption. According to another aspect of the invention, establishing a secure two-way RFID communication link includes a reader modulating a carrier signal with a noise encryption signal and broadcasting the noise-encrypted carrier to a singulated tag. The tag backscatter modulates the noise-encrypted carrier with a first portion of a key and/or a one-time pad pseudorandom number. If a key is used, upon receiving the backscattered signal the reader verifies that the tag is authentic, and, if verified as authentic, transmits a second portion of the key, possibly encrypted by a function depending on the one-time pad pseudorandom number, to the tag.

摘要翻译： 用于提供安全双向（读写器到标签和标签到阅读器）RFID通信的方法和设备。 根据本发明的一个方面，标签从读取器接收噪声加密的RF载波信号，并用标签信息对后向散射进行调制。 窃听者无法从反向散射信号中提取标签信息，因为它被噪声加密掩蔽。 根据本发明的另一方面，建立安全双向RFID通信链路包括读取器，利用噪声加密信号调制载波信号，并将经噪声加密的载波广播到单个标签。 标签反向散射利用键的第一部分和/或一次性衬垫伪随机数来调制噪声加密的载波。 如果使用密钥，则在接收到反向散射信号时，读取器验证标签是可信的，并且如果被证实为真实的，则发送密钥的第二部分，可能由根据一次性衬垫伪随机数的功能加密， 到标签。

公开(公告)号：US20050237158A1

公开(公告)日：2005-10-27

申请号：US11090961

申请日：2005-03-25

申请人： Scott Cooper ,  Kurt Sundstrom ,  Aanand Esterberg ,  Christopher Diorio ,  Vincent Moretti ,  Todd Humes

发明人： Scott Cooper ,  Kurt Sundstrom ,  Aanand Esterberg ,  Christopher Diorio ,  Vincent Moretti ,  Todd Humes

IPC分类号： G06K7/00 ,  H04Q5/22

CPC分类号： G06K7/10049 ,  G06K7/0008

摘要： A process is disclosed for communicating with individual tags in a population of tags having a binary tree organization, wherein each tag corresponds to a leaf node of the binary tree. The process includes singulating a predetermined leaf node and returning to a designated re-entry node associated with the predetermined leaf node after singulating.

摘要翻译： 公开了一种与具有二叉树组织的标签群体中的各个标签通信的过程，其中每个标签对应于二叉树的叶节点。 该过程包括在分割之后，分割预定的叶节点并返回到与预定叶节点相关联的指定重入节点。

公开(公告)号：US20050237157A1

公开(公告)日：2005-10-27

申请号：US11090899

申请日：2005-03-25

申请人： Scott Cooper ,  Kurt Sundstrom ,  Aanand Esterberg ,  Christopher Diorio ,  Vincent Moretti

发明人： Scott Cooper ,  Kurt Sundstrom ,  Aanand Esterberg ,  Christopher Diorio ,  Vincent Moretti

IPC分类号： G06K7/00 ,  H04Q5/22

CPC分类号： G06K7/10049 ,  G06K7/0008

摘要： A radio frequency identification tag is disclosed that is configured to transmit a signal modulated with one of more than two different subcarrier modulation frequencies such that the signal represents more than one binary bit as a single symbol.

摘要翻译： 公开了一种射频识别标签，其被配置为发送用多于两个不同子载波调制频率之一调制的信号，使得信号表示多于一个二进制位作为单个符号。

公开(公告)号：US20070296603A1

公开(公告)日：2007-12-27

申请号：US11849737

申请日：2007-09-04

申请人： Christopher Diorio ,  Thomas Anderl ,  Scott Cooper ,  Aanand Esterberg

发明人： Christopher Diorio ,  Thomas Anderl ,  Scott Cooper ,  Aanand Esterberg

IPC分类号： H04L1/00

CPC分类号： G06K7/0008 ,  G06K7/10069 ,  G06K7/10198

摘要： RFID readers, systems, and methods are provided for overcoming the effects of RF interference. While a system is communicating in a channel, RF interference is monitored. If it is low, then hopping to another channel is performed according to an ordinary decision. But if interference is high, then hopping out to another channel can be earlier than would be dictated by the ordinary decision under the same circumstances. The earlier hopping out can result in diminishing communication in channels with a lot of RF interference.

摘要翻译： 提供RFID读取器，系统和方法来克服RF干扰的影响。 当系统正在通道中进行通信时，会监视射频干扰。 如果为低，则根据普通决定执行到另一信道的跳频。 但是，如果干扰较大，那么跳出另一个频道可能会比同样情况下的普通决策所规定的更早。 较早的跳出可能导致频道中的通信频繁减少，具有大量的射频干扰。

公开(公告)号：US20050269408A1

公开(公告)日：2005-12-08

申请号：US11136948

申请日：2005-05-24

申请人： Aanand Esterberg ,  William Colleran ,  Scott Cooper

发明人： Aanand Esterberg ,  William Colleran ,  Scott Cooper

IPC分类号： G06K7/00

CPC分类号： G06K7/0008

摘要： Systems and methods to determine timebase and timing (i.e., time sync) of received signals in RFID systems. Multiple matched filters corresponding to multiple timebases are used to receive the preambles of signals received from RFID tags. The multiple matched filters define a range of expected timebases of the received signals. The matched filter with the maximum output signal peak is used to derive the timebase and timing of the received signal. Viterbi techniques can be used in determining the timebase and timing to incorporate a portion of the data signal in addition to the preamble. Reconfigurable matched filters can be used so that after a preliminary timebase is determined as described above, the matched filters can be reconfigured to define a new smaller range centered about the preliminary timebase. This allows the timebase to be determined with finer resolution when another preamble portion is received.

摘要翻译： 确定RFID系统中接收信号的时基和定时（即，时间同步）的系统和方法。 对应于多个时基的多个匹配滤波器被用于接收从RFID标签接收的信号的前导码。 多个匹配滤波器定义了接收信号的预期时基的范围。 具有最大输出信号峰值的匹配滤波器用于导出接收信号的时基和定时。 除了前导码之外，维特比技术可用于确定并入数据信号的一部分的时基和定时。 可以使用可重配置匹配滤波器，使得在如上所述确定初步时基之后，可以重新配置匹配滤波器以定义以初步时基为中心的新的较小范围。 这允许当接收另一个前同步码部分时，以更精细的分辨率确定时基。

公开(公告)号：US08279045B2

公开(公告)日：2012-10-02

申请号：US12057467

申请日：2008-03-28

申请人： Christopher J. Diorio ,  Paul Dietrich ,  Theron Stanford ,  Chad Lindhorst ,  Kambiz Rahimi ,  Ali Aiouaz ,  Aanand Esterberg

发明人： Christopher J. Diorio ,  Paul Dietrich ,  Theron Stanford ,  Chad Lindhorst ,  Kambiz Rahimi ,  Ali Aiouaz ,  Aanand Esterberg

IPC分类号： H04Q5/22

CPC分类号： G06K7/0008 ,  G06K7/10039 ,  G06Q10/087

摘要： RFID tags and chips for RFID tags are capable of being inventoried in one or more early attempts. These tags are capable of then refraining from participating in one or more subsequent inventorying attempts. In some embodiments refraining is performed solely by the tag, while in others it is guided by the RFID reader. In some embodiments, an inventoried indicator in the tag becomes updated upon backscattering. The updated value is used by the tag to recognize a subsequent attempt, and thus refrain from participating in it. This permits the subsequent attempt to be used more intensively for inventorying the more elusive, harder-to-read tags, especially in more demanding scenarios.

摘要翻译： 用于RFID标签的RFID标签和芯片能够在一个或多个早期尝试中进行盘点。 这些标签能够避免参与一个或多个后续的盘点尝试。 在一些实施例中，仅通过标签进行避免，而在其它实施例中，RFID由RFID读取器引导。 在一些实施例中，标签中的盘存指示符在后向散射时被更新。 标签使用更新的值来识别后续尝试，因此不要参与。 这允许随后的尝试更加集中地用于清查更难以捉摸，难以阅读的标签，特别是在更苛刻的场景中。