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    RADIO FREQUENCY LEAKAGE DETECTION IN A CABLE PLANT
    51.
    发明申请
    RADIO FREQUENCY LEAKAGE DETECTION IN A CABLE PLANT 有权
    电缆厂无线电频率检测

    公开(公告)号：US20170019148A1

    公开(公告)日：2017-01-19

    申请号：US15276263

    申请日：2016-09-26

    Applicant: Cable Television Laboratories, Inc.

    Inventor： Thomas H. Williams

    IPC: H04B3/46 ,  G01S13/06 ,  G01R31/02 ,  G01R29/08

    CPC classification number: H04B3/46 ,  G01R29/0835 ,  G01R31/025 ,  G01R31/08 ,  G01R31/083 ,  G01S5/02 ,  G01S13/06 ,  H04B1/525 ,  H04B17/354

    Abstract: Embodiments provided describe detections of RF leakage test signal emanating from cable plant. In one embodiment a single mobile receive antenna, connected to a complex demodulator mobile receiver, receives a stabilized test signal radiating from the cable plant. The test signal may be a known continuous wave (CW) carrier or other deterministic signal. The received test signal varies in phase as a function of a position of the mobile receive antenna relative to the location of a leakage antenna. The phase variance forms a Doppler shift as the test antenna moves relative to the leakage antenna. The receiver generates multiple in-phase (I) and quadrature (Q) test signal samples over a SPA (synthetic phased array) distance as the test antenna's travels, and the samples are inserted into a Fourier transform. The result of the transform is instantaneous Doppler frequency shift, from which a bearing angle can be computed.

    Abstract translation: 提供的实施例描述了从电缆设备发出的RF泄漏测试信号的检测。 在一个实施例中，连接到复杂解调器移动接收机的单个移动接收天线接收从电缆设备辐射的稳定的测试信号。 测试信号可以是已知的连续波（CW）载波或其它确定性信号。 接收到的测试信号作为移动接收天线相对于泄漏天线的位置的位置的函数而相位变化。 当测试天线相对于漏电天线移动时，相位变化形成多普勒频移。 当测试天线行进时，接收机通过SPA（合成相控阵）距离产生多个同相（I）和正交（Q）测试信号样本，并将样本插入傅里叶变换。 变换的结果是瞬时多普勒频移，从中可以计算出一个方位角。

    RADIO FREQUENCY LEAKAGE DETECTION IN A CABLE PLANT
    52.
    发明申请
    RADIO FREQUENCY LEAKAGE DETECTION IN A CABLE PLANT 有权
    电缆厂无线电频率检测

    公开(公告)号：US20160036492A1

    公开(公告)日：2016-02-04

    申请号：US14812916

    申请日：2015-07-29

    Applicant: CABLE TELEVISION LABORATORIES, INC.

    Inventor： Thomas H. Williams ,  Colin Justis

    IPC: H04B3/46 ,  G01S3/14 ,  H04B1/16

    CPC classification number: H04B3/46 ,  G01R31/025 ,  G01R31/08 ,  G01R31/083 ,  G01S5/02 ,  H04B1/16

    Abstract: Embodiments described provide detection of RF leaks in a coaxial cable of a cable plant. One embodiment comprises a mobile device that includes an antenna, a quadrature demodulator, and a controller. The antenna receives an RF signal from an RF leak in the coaxial cable. The quadrature demodulator demodulates the RF signal to generate IQ data. The controller determines changes in a phase angle of the RF signal based on the IQ data generated as the mobile device is in motion, and identifies that the mobile device is travelling toward the RF leak responsive to determining that the phase angle is advancing. The controller identifies that the mobile device is travelling away from the RF leak responsive to determining that the phase angle is retarding.

    Abstract translation: 所描述的实施例提供了对电缆设备的同轴电缆中的RF泄漏的检测。 一个实施例包括包括天线，正交解调器和控制器的移动设备。 天线从同轴电缆中的RF泄漏接收RF信号。 正交解调器解调RF信号以产生IQ数据。 控制器基于随着移动设备在运动中生成的IQ数据来确定RF信号的相位角的变化，并且响应于确定相位角正在前进，识别移动设备正朝向RF泄漏行进。 响应于确定相位角正在延迟，控制器识别移动设备正在远离RF泄漏。

    Analysis of captured random data signals to measure linear and nonlinear distortions
    53.
    发明授权
    Analysis of captured random data signals to measure linear and nonlinear distortions 有权
    分析捕获的随机数据信号以测量线性和非线性失真

    公开(公告)号：US09209863B2

    公开(公告)日：2015-12-08

    申请号：US13963957

    申请日：2013-08-09

    Applicant: Cable Television Laboratories, Inc.

    Inventor： Thomas H. Williams ,  Luis Alberto Campos

    IPC: H03D1/04 ,  H04B3/46 ,  H04L12/26 ,  H04B10/079 ,  H04W24/08

    CPC classification number: H04B3/46 ,  H04B10/07953 ,  H04B10/6163 ,  H04L43/08 ,  H04W24/08

    Abstract: A method to capture random data signals at an end point in a broadband network and process them via digital signal processing (DSP) techniques to determine both linear distortions and nonlinear distortions. In a distribution network, such as a tree and branch cable network, the location of the impairment addition can be identified by determining location of terminals have a distortion and locations of terminals that do not have a distortion. Linear distortions may be determined by an autocorrelation of the captured signal with itself. Nonlinear distortions may be determined by processing measured energy in a vacant band with manufactured energy in the vacant band. If a vacant band is not available, one can be created by demodulating a signal occupying the band, and subtracting the demodulated signal from the measured signal plus interference in a band, leaving only the interference.

    Abstract translation: 一种在宽带网络终端捕获随机数据信号的方法，并通过数字信号处理（DSP）技术对其进行处理，以确定线性失真和非线性失真。 在诸如树和分支电缆网络的分配网络中，可以通过确定终端的位置具有失真和不具有失真的终端的位置来识别损害附加的位置。 线性失真可以通过捕获的信号与其自身的自相关来确定。 可以通过在空带中制造能量的空带中处理测量的能量来确定非线性失真。 如果空闲频带不可用，可以通过解调占用频带的信号，并从测量信号中减去解调信号加上频带中的干扰来创建，只留下干扰。

    Hybrid full duplex communications in a radio frequency cable network
    56.
    发明授权
    Hybrid full duplex communications in a radio frequency cable network 有权

    公开(公告)号：US11569973B1

    公开(公告)日：2023-01-31

    申请号：US17140072

    申请日：2021-01-02

    Applicant: CABLE TELEVISION LABORATORIES, INC.

    Inventor： Belal Hamzeh ,  Thomas H. Williams ,  Daniel Rice ,  Luis Alberto Campos

    IPC: H04L5/14 ,  H04L5/00 ,  H04L12/28 ,  H04N21/61 ,  H04B3/487 ,  H04B3/32

    Abstract: Systems and methods presented herein provide for improved duplex communications in an RF cable network comprising a plurality of CMs. In one embodiment, a system includes a CMTS operable to transmit downstream communications to the CMs and to process upstream communications from the CMs. The system also includes a duplex RF communication path between the CMTS and the CMs. The CMTS is further operable to transmit a control signal that directs a first of the CMs to transmit, to direct the remaining CMs to receive the transmission from the first CM, to direct the CMs to report received power levels of the transmission from the first CM, and to calculate RF isolations of the remaining CMs with respect to the first CM based on the reported power levels.

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