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    • 63. 发明授权
    • Hybrid wireless optical and radio frequency communication link
    • 混合无线光和射频通信链路
    • US07110678B2
    • 2006-09-19
    • US10840172
    • 2004-05-05
    • Heinz WillebrandMaha Achour
    • Heinz WillebrandMaha Achour
    • H04B10/00
    • H04B10/1123H04B10/114
    • A hybrid wireless optical and radio frequency (RF) communication link utilizes parallel free-space optical and RF paths for transmitting data and control and status information. The optical link provides the primary path for the data, and the RF link provides a concurrent or backup path for the network data, as well as a reliable and primary path for the control and status information. When atmospheric conditions degrade the optical link to the point at which optical data transmission fails, the hybrid communication link switches to the RF link to maintain availability of data communications. The switch may occur automatically, based on an assessment of the quality of the optical signal communicated through the optical path.
    • 混合无线光和射频(RF)通信链路利用并行的自由空间光和RF路径来发送数据和控制和状态信息。 光链路为数据提供主要路径,RF链路为网络数据提供并行或备份路径,以及用于控制和状态信息的可靠和主路径。 当大气条件使光链路降级到光数据传输失败的时候,混合通信链路切换到RF链路,以保持数据通信的可用性。 基于通过光路传送的光信号的质量的评估,开关可以自动发生。
    • 64. 发明授权
    • Anti-Geolocation
    • 反地理位置
    • US09201132B2
    • 2015-12-01
    • US13462514
    • 2012-05-02
    • Mark HsuDavid SmithJeremy RodeAnis HusainMaha Achour
    • Mark HsuDavid SmithJeremy RodeAnis HusainMaha Achour
    • G01S1/72G01S7/481H04B7/04
    • G01S7/282G01S1/725G01S7/4814H04B7/0413
    • Methods, apparatus, and articles of manufacture make Geolocation of a source transmitter more difficult or impossible. Scatterers common to a source transmitter and an intended receiver are identified using a variety of techniques, such as iterative time reversal (ITR) and Singular Value Decomposition (SVD) of a scatter matrix. The source transmitter then uses time reversal and knowledge of the signatures of the scatterers to focus its transmissions on one or more of the scatterers, instead of the intended receiver. The source transmitter may have multiple antennas or antenna elements. The source transmitter and/or the intended receiver may include antenna elements with Near-Field Scatterers to enable spatial focusing below the diffraction limit at the frequencies of interest. The source transmitter may be a plurality of ad hoc nodes cooperating with each other.
    • 方法,装置和制品使得源发射器的地理定位更加困难或不可能。 使用各种技术来识别源发射机和预期接收机共同的散射体,例如散射矩阵的迭代时间反演(ITR)和奇异值分解(SVD)。 然后,源发射机使用时间反转和散射体的签名的知识来将其传输聚焦在一个或多个散射体上,而不是预期的接收器。 源发射机可以具有多个天线或天线元件。 源发射机和/或预期接收机可以包括具有近场散射体的天线元件,以使得在感兴趣的频率处的衍射极限以下的空间聚焦。 源发射机可以是彼此协作的多个自组织节点。
    • 65. 发明申请
    • ANTI-GEOLOCATION
    • 反地理
    • US20120328037A1
    • 2012-12-27
    • US13462514
    • 2012-05-02
    • Mark HsuDavid SmithJeremy RodeAnis HusainMaha Achour
    • Mark HsuDavid SmithJeremy RodeAnis HusainMaha Achour
    • H04L9/00H04B7/02
    • G01S7/282G01S1/725G01S7/4814H04B7/0413
    • Methods, apparatus, and articles of manufacture make Geolocation of a source transmitter more difficult or impossible. Scatterers common to a source transmitter and an intended receiver are identified using a variety of techniques, such as iterative time reversal (ITR) and Singular Value Decomposition (SVD) of a scatter matrix. The source transmitter then uses time reversal and knowledge of the signatures of the scatterers to focus its transmissions on one or more of the scatterers, instead of the intended receiver. The source transmitter may have multiple antennas or antenna elements. The source transmitter and/or the intended receiver may include antenna elements with Near-Field Scatterers to enable spatial focusing below the diffraction limit at the frequencies of interest. The source transmitter may be a plurality of ad hoc nodes cooperating with each other.
    • 方法,装置和制品使得源发射器的地理定位更加困难或不可能。 使用各种技术来识别源发射机和预期接收机共同的散射体,例如散射矩阵的迭代时间反演(ITR)和奇异值分解(SVD)。 然后,源发射机使用时间反转和散射体的签名的知识来将其传输聚焦在一个或多个散射体上,而不是预期的接收器。 源发射机可以具有多个天线或天线元件。 源发射机和/或预期接收机可以包括具有近场散射体的天线元件,以使得在感兴趣的频率处的衍射极限以下的空间聚焦。 源发射机可以是彼此协作的多个自组织节点。
    • 69. 发明授权
    • Method and apparatus for 45.degree. phase ambiguity resolution for one
coded bit per symbol 8PSK modulation
    • 用于45码相位模糊度分辨率的方法和装置,每码元8PSK调制一个编码位
    • US6061408A
    • 2000-05-09
    • US293251
    • 1999-04-16
    • Maha Achour
    • Maha Achour
    • H04L27/18H04L5/12
    • H04L27/18
    • A method and apparatus for 45.degree. phase ambiguity resolution for one coded bit per symbol 8PSK modulation resolves phase ambiguity by selection of pre-differential encoders. A trellis encoder for 8PSK modulation of the type in which input data bits are encoded to a three-bit symbols includes a differential encoder, a convolutional encoder and first and second encoding assemblies. A decoder for decoding trellis coded data of 8PSK modulation includes a Viterbi decoder, a differential decoder, a convolutional decoder and first and second decoder assemblies. Each of the encoding and decoding assemblies includes multiplexing logic for selecting from among possible data paths according to a phase invariant scheme.
    • 一个符号编码比特的45°相位模糊度分辨方法和装置8PSK调制通过选择预差分编码器来解决相位模糊。 输入数据位被编码为三位符号的类型的8PSK调制格子编码器包括差分编码器,卷积编码器和第一和第二编码组件。 用于解码8PSK调制的格状编码数据的解码器包括维特比解码器,差分解码器,卷积解码器和第一和第二解码器组件。 每个编码和解码组件包括用于根据相位不变方案从可能的数据路径中进行选择的多路复用逻辑。
    • 70. 发明申请
    • DISTRIBUTED CO-OPERATING NODES USING TIME REVERSAL
    • 使用时间反转的分销合作伙伴
    • US20140126567A1
    • 2014-05-08
    • US14114901
    • 2012-05-02
    • Anis HusainJeremy RodeDavid SmithMark HsuMaha Achour
    • Anis HusainJeremy RodeDavid SmithMark HsuMaha Achour
    • H04W56/00H04W84/18
    • H04W56/0065H04B7/024H04J3/0638H04J3/0682H04W56/001H04W56/0015H04W56/0025H04W84/18
    • Methods and systems for coherent distributed communication techniques using time reversal are disclosed. In one aspect, cooperating nodes of a cluster can move relative to each other and relative to an intended receiver of the nodes' data transmissions. The nodes are synchronized to a common time reference, and data for transmission from the cluster is distributed to the nodes. The intended receiver sends a sounding signal to the nodes. Each node receives the sounding signal, obtains the channel response between the intended receiver and itself, and time-reverses the channel response. Each node then convolves its time-reversed channel response with the data to obtain the node's convolved data Each node waits a predetermined time following the time reference signal, as determined based on the common time reference. At the expiration of the predetermined time period, the nodes simultaneously transmit their convolved data
    • 公开了使用时间反转的相干分布式通信技术的方法和系统。 在一个方面,集群的协作节点可以相对于彼此并相对于节点的数据传输的预期接收器移动。 节点被同步到公共时间参考,并且用于从集群传输的数据被分发到节点。 预期的接收器向节点发送一个探测信号。 每个节点接收探测信号,获得目标接收机与其本身之间的信道响应,并对信道响应进行时间反向。 然后,每个节点将其时间反转的信道响应与数据进行卷积,以获得节点的卷积数据。每个节点等待基于公共时间参考确定的时间参考信号之后的预定时间。 在预定时间段到期时,节点同时发送它们的卷积数据