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123 条记录 (耗时 0.014 秒)

    METHOD AND SYSTEM FOR NON-LINEARITY COMPENSATION IN OPTICAL TRANSMISSION SYSTEMS
    1.
    发明授权
    METHOD AND SYSTEM FOR NON-LINEARITY COMPENSATION IN OPTICAL TRANSMISSION SYSTEMS 有权

    公开(公告)号：EP2543150B1

    公开(公告)日：2018-05-30

    申请号：EP11750073.6

    申请日：2011-03-01

    申请人： Ofidium Pty Ltd

    发明人： LOWERY, Arthur James ,  DU, Liang Bangyuan

    IPC分类号： H04B10/61 ,  H04B10/2507

    CPC分类号： H04B10/25073 ,  H04B10/6161 ,  H04B10/6163 ,  H04B10/6971

    摘要： An equalizer (200) for equalization of a signal transmitted via an optical fiber link from a transmitter to a corresponding receiver employs a backpropagation model (300) which comprises one or more sequential segments collectively representing an inverse fiber link. Each sequential segment comprises a linear backpropagation element (304), and a non-linear backpropagation element (306) having an associated compensation bandwidth (312). The equalizer (200) generates a distortion-mitigated signal by computing, for each sequential segment in turn, a first linear compensated signal from a signal input to the segment in accordance with the linear backpropagation element (304), and a non-linear compensated signal from the first linear compensated signal in accordance with the non-linear backpropagation element (306). Computation of the non-linear compensation signal comprises limiting a bandwidth of a compensation signal derived from the first linear compensated signal in accordance with the associated compensation bandwidth (312).

    CLOCK RECOVERY FOR A CODED LIGHT RECEIVER
    2.
    发明授权
    CLOCK RECOVERY FOR A CODED LIGHT RECEIVER 有权

    公开(公告)号：EP3107225B1

    公开(公告)日：2018-01-31

    申请号：EP16174133.5

    申请日：2016-06-13

    申请人： Philips Lighting Holding B.V.

    发明人： HOEKSTRA, Peter ,  VOS, Benjamin, Johannes ,  BAGGEN, Constant, Paul, Marie, Jozef

    IPC分类号： H04B10/116

    CPC分类号： H04B10/116 ,  H04B10/691 ,  H04B10/6971 ,  H04L7/0012 ,  H04N5/2353 ,  H05B37/0272

    摘要： An apparatus, method and program for receiving a coded light signal comprising a periodically repeating message repeating with a message period. A portion of the message is received in each of a plurality of frames captured by a rolling-shutter camera, with different portions being received in different frames. Using each of a discrete group of trial values of the message period, the respective trial value is used to reconstruct a respective first version of the message from the portions received in a first subset of said frames, and to reconstruct a respective second version of the message from the portions received in a second subset of said frames. For each of the trial values, there is generate a respective value of a measure of similarity between the respective reconstructed first and second versions of the message. An estimate of the message period is determined based on this.

    SIGNAL COMPENSATION METHOD AND DEVICE
    3.
    发明公开
    SIGNAL COMPENSATION METHOD AND DEVICE 审中-公开

    公开(公告)号：EP3217618A4

    公开(公告)日：2017-10-18

    申请号：EP14908823

    申请日：2014-12-26

    申请人： HUAWEI TECH CO LTD

    发明人： CHEN WEI ,  MAN JIANGWEI ,  ZENG LI

    IPC分类号： H04L25/03

    CPC分类号： H04B10/6971 ,  G01R31/3004 ,  G01R31/3016 ,  H03M13/256 ,  H04B3/23 ,  H04L25/03038 ,  H04L25/03057 ,  H04L25/03267 ,  H04L2025/03617

    摘要： The present invention discloses a signal compensation method and device. The method includes: receiving an input signal sequence suffering from ISI interference, and using a first filtering coefficient to perform filtering compensation on the received signal sequence, to obtain a first compensation signal sequence; using a balance filtering coefficient to perform filtering compensation on the first compensation signal sequence, to obtain a balance compensation result, where the balance filtering coefficient is obtained by adjusting, according to a first compensation error, a balance filtering coefficient used last time; and performing sequence estimation on the received balance compensation result and outputting the balance compensation result. A first compensation error is generated by a back-end compensation module, the first compensation error is used to adjust a balance filtering coefficient in an iterative manner, and the balance filtering coefficient is used to perform filtering compensation on a first compensation signal sequence, thereby effectively compensating for a signal sequence suffering from ISI interference, and improving performance of an optical fiber communications system.

    OPTICAL COMMUNICATION SYSTEMS AND METHODS WITH CROSSTALK CANCELLATION
    7.
    发明公开
    OPTICAL COMMUNICATION SYSTEMS AND METHODS WITH CROSSTALK CANCELLATION 有权
    光通信系统和程序，SIDE TALK还原

    公开(公告)号：EP2812653A1

    公开(公告)日：2014-12-17

    申请号：EP13746831.0

    申请日：2013-02-06

    申请人： Adtran, Inc.

    发明人： JOFFE, daniel

    IPC分类号： G01C19/68

    CPC分类号： H04B10/00 ,  H04B10/071 ,  H04B10/6971

    摘要： An optical system (10) has an optical emitter (25) that transmits an optical signal through an optical fiber (15). An optical detector (27) detects light from the fiber and provides an analog signal indicative of such light. A crosstalk cancellation element (31 ) is configured to receive an electrical signal from the optical emitter and to adjust such signal in order to form a cancellation signal that models the optical and/or electrical crosstalk affecting the analog signal. The cancellation signal is subtracted from the analog signal thereby removing optical and/or electrical crosstalk from the analog signal.

    Method and device for performing channel estimation and equalization for an optical OFDM signal
    8.
    发明公开
    Method and device for performing channel estimation and equalization for an optical OFDM signal 有权
    用于执行信道估计和补偿的光OFDM信号的方法和装置

    公开(公告)号：EP2690812A1

    公开(公告)日：2014-01-29

    申请号：EP12177863.3

    申请日：2012-07-25

    申请人： Mitsubishi Electric R&D Centre Europe B.V. ,  Mitsubishi Electric Corporation

    发明人： Froc, Gwillerm ,  Weppe, Olivier

    IPC分类号： H04J14/02

    CPC分类号： H04B10/5563 ,  H04B10/6971 ,  H04L25/0232

    摘要： The invention relates to an optical receiver (102) adapted for receiving via a transmission channel an orthogonal frequency-division multiplex optical signal via a plurality of subcarriers. The optical receiver comprises means for performing channel estimation (150) and means for performing equalization (126) on the basis of coefficients representative of the transmission channel, said coefficients being provided by said means for performing channel estimation. The means for performing channel estimation comprise: means for processing a training sequence (151,152,153) received via a first subset among said plurality of subcarriers; and means for interpolating coefficients (160), the interpolated coefficients corresponding to subcarriers not processed by said means for processing the training sequence.