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    Detecting Burst PIM in Downstream at Drop
    3.
    发明申请
    Detecting Burst PIM in Downstream at Drop 有权

    公开(公告)号：US20190222310A1

    公开(公告)日：2019-07-18

    申请号：US16125824

    申请日：2018-09-10

    Applicant: ARCOM DIGITAL, LLC

    Inventor： Victor M. Zinevich

    IPC: H04B10/079 ,  H04B10/2575 ,  H04B10/2507

    CPC classification number: H04B10/0795 ,  G01R23/20 ,  G01R31/2822 ,  H04B3/487 ,  H04B10/2507 ,  H04B10/25751 ,  H04L1/248 ,  H04M3/304

    Abstract: Detecting PIM in a downstream signal, wherein the downstream signal is received from a cable plant via a subscriber network and an upstream signal is transmitted to the cable plant via the subscriber network. The upstream signal is transmitted in bursts during active intervals. PIM arises from an interaction between the upstream signal and a nonlinear component in the subscriber network and occurs in bursts corresponding to the upstream signal. The detection steps are: (a) identifying the potentially affected downstream signal from the upstream signal; (b) receiving the downstream signal during an active interval; (c) measuring a metric of the downstream signal to obtain an active value; (d) receiving the downstream signal during a quiet interval; (e) measuring the metric of the downstream signal to obtain a quiet value; (f) comparing active and quiet values; and (g) determining whether PIM distortion has been detected based on the comparison.

    METHOD OF MEASURING CROSSTALK OF MULTICORE FIBER AND APPARATUS OF MEASURING THE SAME
    7.
    发明申请
    METHOD OF MEASURING CROSSTALK OF MULTICORE FIBER AND APPARATUS OF MEASURING THE SAME 审中-公开

    公开(公告)号：US20180246007A1

    公开(公告)日：2018-08-30

    申请号：US15755345

    申请日：2017-01-26

    Applicant: FUJIKURA LTD.

    Inventor： Shota Saito ,  Katsuhiro Takenaga

    IPC: G01M11/00 ,  G01M11/02 ,  H04B3/487 ,  G02B6/02

    CPC classification number: G01M11/33 ,  G01M11/0207 ,  G02B6/02042 ,  H04B3/487

    Abstract: A method of measuring crosstalk of a multicore fiber, the method including capturing an emitted light pattern at an end portion of a dummy fiber and obtaining a correlation data between a power of the light incident on the dummy fiber and the emitted light pattern, irradiating one core of the multicore fiber with a light through the dummy fiber, and measuring a power of a reference light emitted from the core, capturing a crosstalk light emitted from a different core different from the core on which the light is incident under a state where the reference light is masked, and estimating a power of the crosstalk light from a captured data of the crosstalk light and the correlation data, and calculating the crosstalk from the power of the reference light and the power of the crosstalk light.

    Multi-User Multiple-Input And Multiple-Output For Digital Subscriber Line
    8.
    发明申请
    Multi-User Multiple-Input And Multiple-Output For Digital Subscriber Line 审中-公开

    公开(公告)号：US20180234144A1

    公开(公告)日：2018-08-16

    申请号：US15953210

    申请日：2018-04-13

    Applicant: Futurewei Technologies, Inc.

    Inventor： Amir H. Fazlollahi ,  Xiang Wang

    IPC: H04B7/0456 ,  H04B3/487

    CPC classification number: H04B7/0456 ,  H04B3/32 ,  H04B3/487

    Abstract: A method implemented in a wireless network element (NE), comprising obtaining, via a processor of the wireless NE, a plurality of encoded signals associated with a plurality of downstream (DS) channels in a wireless communication network, wherein the plurality of DS channels form a plurality of DS multiple-input and multiple-output (MIMO) groups, performing, via the processor, MIMO pre-coding on the plurality of encoded signals according to the plurality of DS MIMO groups to produce MIMO pre-coder output signals of the plurality of DS MIMO groups, performing, via the processor, a crosstalk pre-coding across the MIMO groups using a crosstalk pre-coding matrix on the MIMO pre-coder output signals of the plurality of DS MIMO groups to produce a plurality of output signals, with the crosstalk pre-coding matrix computed according to a first DS channel matrix and a DS MIMO channel matrix, wherein the first DS channel matrix comprises first diagonal entries representing first direct channel estimates of the plurality of DS channels at a first subcarrier and first off-diagonal entries representing co-channel interference estimates of the plurality of DS channels at the first subcarrier, a first diagonal block of the first DS channel matrix representing MIMO channels in a first DS MIMO group of the plurality of DS MIMO groups, and wherein the DS MIMO channel matrix comprises a second diagonal block and off-diagonal blocks, the second diagonal block corresponding to the first diagonal block of the first DS channel matrix, and with the off-diagonal blocks comprising values of zeros, and synchronously transmitting, via one or more transmitters of the wireless NE, the plurality of output signals to a plurality of remote wireless NEs via the plurality of DS channels.

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