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    • 4. 发明申请
    • PORTABLE RADIO FREQUENCY IDENTIFICATION (RFID) READER
    • 便携式无线电频率识别(RFID)读取器
    • WO2011088009A1
    • 2011-07-21
    • PCT/US2011/020759
    • 2011-01-11
    • THE BOEING COMPANYCHEN, MingSHI, FongVOYCE, Kenneth G.
    • CHEN, MingSHI, FongVOYCE, Kenneth G.
    • G01S3/32G01S13/75G01S13/44
    • G01S13/4445G01S3/043G01S13/4454G01S13/75
    • A particular portable radio frequency identification (RFID) reader includes an active antenna array including a plurality of antenna elements to receive RFID signals from RFID devices. The antenna elements include control circuitry to control a beam pattern generated by the active antenna array. The portable RFID reader further includes sum circuitry and difference circuitry. The sum circuitry is operable to determine a sum signal by summing the RFID signals received by at least two of the plurality of antenna elements. The difference circuitry is operable to determine a difference signal between the RFID signals received by at least two of the plurality of antenna elements. The portable RFID reader also includes a controller to electronically steer the beam pattern and to determine a direction from the RFID reader to a particular RFID device.
    • 特定便携式射频识别(RFID)读取器包括有源天线阵列,其包括用于从RFID设备接收RFID信号的多个天线元件。 天线元件包括用于控制由有源天线阵列产生的波束图案的控制电路。 便携式RFID读取器还包括和电路和差分电路。 总和电路可操作以通过将由多个天线元件中的至少两个接收的RFID信号相加来确定和信号。 差分电路可操作以确定由多个天线元件中的至少两个天线元件接收的RFID信号之间的差分信号。 便携式RFID读取器还包括控制器,用于电子地操纵光束图案并确定从RFID读取器到特定RFID设备的方向。
    • 7. 发明申请
    • DIRECT-SEQUENCE CDMA METHOD AND DEVICE
    • 直接序列CDMA方法和设备
    • WO2005057824A2
    • 2005-06-23
    • PCT/IB2004/003284
    • 2004-10-08
    • NOKIA CORPORATIONNOKIA INC.WANG, HaifengXU, JingCHEN, MingCHENG, Shixin
    • WANG, HaifengXU, JingCHEN, MingCHENG, Shixin
    • H04L
    • H04L25/03159H04L5/026H04L27/2607H04L2025/03522H04L2025/03617
    • In code division multiple access communications wherein a plurality of data streams carrying a plurality of transmit symbols are spread by a plurality of assigned spread code, the data streams are divided into a plurality of data blocks and a plurality of prefixes in symbol-level are added to the data blocks prior to the data streams being spread and combined for transmission. At the receive side, the prefixes are removed from the received data stream in the time domain and the prefix-removed data stream is converted into a transformed signal in the frequency domain. A feed-forward filter is used to implement a joint equalization and despreading operation by element-by-element multiplications in frequency domain. A feedback filter is used to remove the inter-symbol interference and update the feed-forward filter through a feedback loop.
    • 在码分多址通信中,其中携带多个发送符号的多个数据流由多个分配的扩展码扩展,将数据流分成多个数据块,并且添加符号级中的多个前缀 在数据流被传播和组合用于传输之前到数据块。 在接收侧,在时域中从接收的数据流中去除前缀​​,并将前缀去除的数据流转换成频域中的变换信号。 前馈滤波器用于通过频域中的逐个元素乘法来实现联合均衡和解扩操作。 反馈滤波器用于消除符号间干扰,并通过反馈回路更新前馈滤波器。