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    RFID READER SYSTEMS DETECTING PILOT TONE
    1.
    发明申请
    RFID READER SYSTEMS DETECTING PILOT TONE 审中-公开
    RFID读写器系统检测引导音

    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。

    Adaptable bandwidth RFID tags
    4.
    发明申请
    Adaptable bandwidth RFID tags 有权
    适应带宽RFID标签

    公开(公告)号：US20050225435A1

    公开(公告)日：2005-10-13

    申请号：US10823991

    申请日：2004-04-13

    申请人： Christopher Diorio ,  Scott Cooper ,  John Hyde ,  Amir Sarajedini ,  Kurt Sundstrom

    发明人： Christopher Diorio ,  Scott Cooper ,  John Hyde ,  Amir Sarajedini ,  Kurt Sundstrom

    IPC分类号： G06K19/07 ,  H04Q5/22

    CPC分类号： G06K19/0723

    摘要： RFID tags, tag circuits, and methods adapting the reception bandwidth. A tag has a decoder for decoding a first received wireless signal subject to a reception bandwidth setting. The tag also has a selector switch for transitioning to a different setting, such as by switching to using a different filter. A subsequently received second signal is decoded subject to the new reception bandwidth setting.

    摘要翻译： RFID标签，标签电路和适应接收带宽的方法。 标签具有解码器，用于对接收带宽设置的第一接收无线信号进行解码。 标签还具有用于转换到不同设置的选择器开关，例如通过切换到使用不同的滤镜。 经过新的接收带宽设置，随后接收的第二信号被解码。

    RFID SYSTEM COMPONENTS IMPLEMENTING ADJUSTED BACKSCATTER CALCULATIONS AND METHODS
    5.
    发明申请
    RFID SYSTEM COMPONENTS IMPLEMENTING ADJUSTED BACKSCATTER CALCULATIONS AND METHODS 有权
    RFID系统组件实施调整后的计算机和方法

    公开(公告)号：US20080006702A2

    公开(公告)日：2008-01-10

    申请号：US11114614

    申请日：2005-04-25

    申请人： Christopher Diorio ,  Kurt Sundstrom ,  Scott Cooper ,  Todd Humes

    发明人： Christopher Diorio ,  Kurt Sundstrom ,  Scott Cooper ,  Todd Humes

    IPC分类号： G06K19/06

    CPC分类号： G06K19/0723 ,  G06K7/0008 ,  H03J1/0058

    摘要： RFID system components, such as readers and tags, communicate by a reader transmitting waveforms that encode a calibration symbol and a divide ratio. Tags include a processor to determine a backscatter link period result by dividing a count value representing the calibration symbol by the divide ratio and adding an adjustment. Tags modulate a backscatter waveform that includes symbols using a link period determined from the result.

    摘要翻译： 诸如读取器和标签的RFID系统组件由读取器传送，该读取器发送编码校准符号和分频比的波形。 标签包括通过将表示校准符号的计数值除以除法比率并且添加调整来确定反向散射链路周期结果的处理器。 标签使用从结果确定的链路周期调制包括符号的反向散射波形。

    Secure two-way RFID communications
    8.
    发明申请
    Secure two-way RFID communications 审中-公开
    安全双向RFID通信

    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。

    Secure two-way RFID communications
    9.
    发明申请
    Secure two-way RFID communications 审中-公开
    安全双向RFID通信

    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。

    RFID READERS SYSTEMS AND METHODS FOR HOPPING AWAY FROM A FREQUENCY CHANNEL WITH RF INTERFERENCE
    10.
    发明申请
    RFID READERS SYSTEMS AND METHODS FOR HOPPING AWAY FROM A FREQUENCY CHANNEL WITH RF INTERFERENCE 有权
    RFID读写器系统和方法用于从具有RF干扰的频道通道中跳出

    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。