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    ECHO CANCELLATION SYSTEM AND METHOD
    11.
    发明申请
    ECHO CANCELLATION SYSTEM AND METHOD 有权

    公开(公告)号：US20220407602A1

    公开(公告)日：2022-12-22

    申请号：US17821316

    申请日：2022-08-22

    Applicant: Cable Television Laboratories, Inc.

    Inventor： MU XU ,  ZHENSHENG JIA ,  JUNWEN ZHANG ,  HAIPENG ZHANG ,  LUIS ALBERTO CAMPOS

    IPC: H04B10/2507 ,  H04B10/69 ,  H04Q11/00 ,  H04B10/40

    Abstract: An echo cancellation method includes steps of (a) extracting phase-distortion estimates, (b) reconstructing an echo signal, (c) generating a clean signal, and (d) producing a primary signal. Step (a) includes extracting, from a first phase signal, a plurality of phase-distortion estimates, the first phase signal having been estimated from an echo-corrupted signal received at a first coherent transceiver of a coherent optical network. Step (b) includes reconstructing an echo signal from the plurality of phase-distortion estimates and a transmitted signal transmitted by the first coherent transceiver. Step (c) includes generating a clean signal as a difference between the reconstructed echo signal and the first phase signal. Step (d) includes producing a primary signal by mapping each of a plurality of clean-phase estimates of the clean signal to one of a plurality of constellation symbols associated with a modulation scheme of the primary signal.

    SYSTEM AND METHODS FOR DATA COMPRESSION AND NONUNIFORM QUANTIZERS
    13.
    发明申请
    SYSTEM AND METHODS FOR DATA COMPRESSION AND NONUNIFORM QUANTIZERS 有权

    公开(公告)号：US20220312045A1

    公开(公告)日：2022-09-29

    申请号：US17839060

    申请日：2022-06-13

    Applicant: CABLE TELEVISION LABORATORIES, INC.

    Inventor： ZHENSHENG JIA ,  LUIS ALBERTO CAMPOS ,  MU XU ,  JING WANG

    IPC: H04N19/94 ,  H04N19/126 ,  H03M3/00 ,  H04J14/04 ,  H03M1/00 ,  H03M3/04 ,  H03M1/66 ,  H03M1/12 ,  H03M7/30

    Abstract: An optical network includes a transmitting portion configured to (i) encode an input digitized sequence of data samples into a quantized sequence of data samples having a first number of digits per sample, (ii) map the quantized sequence of data samples into a compressed sequence of data samples having a second number of digits per sample, the second number being lower than the first number, and (iii) modulate the compressed sequence of data samples and transmit the modulated sequence over a digital optical link. The optical network further includes a receiving portion configured to (i) receive and demodulate the modulated sequence from the digital optical link, (ii) map the demodulated sequence from the second number of digits per sample into a decompressed sequence having the first number of digits per sample, and (iii) decode the decompressed sequence.

    NETWORK COMMUNICATIONS SYSTEMS AND METHODS
    14.
    发明申请
    NETWORK COMMUNICATIONS SYSTEMS AND METHODS 审中-公开

    公开(公告)号：US20200228207A1

    公开(公告)日：2020-07-16

    申请号：US16827792

    申请日：2020-03-24

    Applicant: CABLE TELEVISION LABORATORIES, INC.

    Inventor： LUIS ALBERTO CAMPOS

    IPC: H04B10/50 ,  H04B10/63 ,  H04B10/532 ,  H04B10/64 ,  H04J14/06 ,  H04J14/04

    Abstract: Methods, systems, and devices for network communications to reduce optical beat interference (OBI) in upstream communications are described. For example, a fiber node may provide a seed source to injection lock upstream laser diodes. Therefore, upstream communications from each injection locked laser diode may primarily include the wavelength associated with each seed source. The seed sources may be unique to each end device and configured to minimize OBI. That is, the upstream laser diodes may be generic, but the collected seed source may enable upstream communications at varying wavelengths. The end device may provide upstream communications by externally modulating a signal generated by the injection locked laser diode.

    NETWORK COMMUNICATIONS SYSTEMS AND METHODS
    18.
    发明申请
    NETWORK COMMUNICATIONS SYSTEMS AND METHODS 有权

    公开(公告)号：US20220123839A1

    公开(公告)日：2022-04-21

    申请号：US17562671

    申请日：2021-12-27

    Applicant: CABLE TELEVISION LABORATORIES, INC.

    Inventor： LUIS ALBERTO CAMPOS

    IPC: H04B10/50 ,  H04B10/63 ,  H04B10/532 ,  H04B10/64 ,  H04J14/06 ,  H04J14/04

    Abstract: Methods, systems, and devices for network communications to reduce optical beat interference (OBI) in upstream communications are described. For example, a fiber node may provide a seed source to injection lock upstream laser diodes. Therefore, upstream communications from each injection locked laser diode may primarily include the wavelength associated with each seed source. The seed sources may be unique to each end device and configured to minimize OBI. That is, the upstream laser diodes may be generic, but the collected seed source may enable upstream communications at varying wavelengths. The end device may provide upstream communications by externally modulating a signal generated by the injection locked laser diode.

    SYSTEMS AND METHODS FOR DELTA-SIGMA DIGITIZATION
    19.
    发明申请
    SYSTEMS AND METHODS FOR DELTA-SIGMA DIGITIZATION 审中-公开

    公开(公告)号：US20200374009A1

    公开(公告)日：2020-11-26

    申请号：US16989572

    申请日：2020-08-10

    Applicant: CABLE TELEVISION LABORATORIES, INC.

    Inventor： JING WANG ,  LUIS ALBERTO CAMPOS ,  ZHENSHENG JIA ,  CURTIS DEAN KNITTLE

    IPC: H04B10/2507 ,  H03M3/00

    Abstract: A baseband processing unit includes a baseband processor configured to receive a plurality of component carriers of a radio access technology wireless service, and a delta-sigma digitization interface configured to digitize at least one carrier signal of the plurality of component carriers into a digitized bit stream, for transport over a transport medium, by (i) oversampling the at least one carrier signal, (ii) quantizing the oversampled carrier signal into the digitized bit stream using two or fewer quantization bits.

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