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    Approximation of recursive least squares equalization
    1.
    发明授权
    Approximation of recursive least squares equalization 有权

    公开(公告)号：US11239929B1

    公开(公告)日：2022-02-01

    申请号：US17203332

    申请日：2021-03-16

    申请人： Ramin Babaee ,  Shahab Oveis Gharan ,  Martin Bouchard ,  Kim B. Roberts

    发明人： Ramin Babaee ,  Shahab Oveis Gharan ,  Martin Bouchard ,  Kim B. Roberts

    IPC分类号： H04B3/46 ,  H04B17/318

    摘要： A receiver is configured to detect, at a communication interface, a received signal that suffers from degradations incurred over a communication channel. The receiver applies an adaptive filter to a series of received blocks of a digital representation of the received signal, thereby generating respective filtered blocks, where each received block represents 2N frequency bins, and where N is a positive integer. The receiver calculates coefficients for use by the adaptive filter on a jth received block as a function of (i) error estimates associated with an (j−D−1)th filtered block, where D is a positive integer representing a number of blocks, and where j is a positive integer greater than (D−1); and (ii) an inverse of an approximate covariance matrix associated with the (j−D−1)th received block, where the approximate covariance matrix is a diagonal matrix of size L×L, and where L is a positive integer lower than 2N.

    Feedback equalization with delay compensation
    2.
    发明授权
    Feedback equalization with delay compensation 有权

    公开(公告)号：US11233568B1

    公开(公告)日：2022-01-25

    申请号：US17090135

    申请日：2020-11-05

    申请人： Shahab Oveis Gharan ,  Ramin Babaee ,  Martin Bouchard ,  Kim B. Roberts

    发明人： Shahab Oveis Gharan ,  Ramin Babaee ,  Martin Bouchard ,  Kim B. Roberts

    IPC分类号： H04B10/06 ,  H04B10/2507 ,  H04B10/2569 ,  H04B10/67 ,  H04B10/532 ,  H04B10/69

    摘要： A receiver is configured to detect, at a communication interface, a received signal that suffers from degradations incurred over a communication channel. The receiver applies an adaptive filter to a series of received blocks of a digital representation of the received signal, thereby generating respective filtered blocks. The receiver calculates coefficients for use by the adaptive filter on an jth received block as a function of (i) error estimates associated with an (j−D−1)th filtered block, where D is a positive integer representing a number of blocks, and where j is a positive integer greater than (D−1); and (ii) delay compensation terms dependent on an estimate of a difference between coefficients used by the adaptive filter on an (j−D−1)th received block and coefficients used by the adaptive filter on an (j−1)th received block

    Parity frame
    5.
    发明授权
    Parity frame 有权

    公开(公告)号：US10200149B2

    公开(公告)日：2019-02-05

    申请号：US15250553

    申请日：2016-08-29

    申请人： Kim B. Roberts ,  Amir K. Khandani

    发明人： Kim B. Roberts ,  Amir K. Khandani

    IPC分类号： H04L1/00 ,  H04B10/61 ,  H03M13/29 ,  H03M13/37 ,  H04B10/50

    摘要： A super-frame for transmission in an optical communications system comprises two or more data frames and a parity frame. All frames in the super-frame have been encoded in accordance with a first Forward Error Correction (FEC) scheme. The parity frame is computed over the two or more data frames (prior to or concurrently with or after encoding via the first FEC scheme) according to a second FEC scheme. At a receiver, the super-frame is decoded in accordance with the first FEC scheme to generate a set of FEC decoded frames in which residual errors are clustered, that is, are non-Poisson. The second FEC scheme, which is particularly suited or designed to correct the clustered non-Poisson residual errors, is used to correct the residual errors.

    MITIGATION OF NARROW-BAND DEGRADATIONS IN A BROADBAND COMMUNICATION SYSTEM
    9.
    发明申请
    MITIGATION OF NARROW-BAND DEGRADATIONS IN A BROADBAND COMMUNICATION SYSTEM 审中-公开
    宽带通信系统中窄带衰减的减缓

    公开(公告)号：US20170012704A1

    公开(公告)日：2017-01-12

    申请号：US14794944

    申请日：2015-07-09

    申请人： Shahab OVEIS GHARAN ,  Kim B. ROBERTS

    发明人： Shahab OVEIS GHARAN ,  Kim B. ROBERTS

    IPC分类号： H04B10/2507 ,  H04B10/61

    CPC分类号： H04B10/2507 ,  H04B10/697 ,  H04L27/2634

    摘要： In a communications system having an analog channel configured to convey a data signal from a transmitter to a receiver, a method of mitigating narrow-band impairment imposed by the analog channel on the data signal within a bounded spectral region of a spectrum of the data signal. A transmitter digital signal processor (Tx DSP) applying a first adaptation function to the data signal prior to transmitting the data signal through the analog channel. A receiver digital signal processor (Rx DSP) applying a second adaptation function to the data signal received through the analog channel. The first and second adaptation functions are selected to cooperatively mitigate effects of the narrow-band impairment imposed by the analog channel.

    摘要翻译： 在具有被配置为将数据信号从发射机传送到接收机的模拟信道的通信系统中，减少由模拟信道施加的窄带损伤对数据信号的频谱的有界频谱区域内的数据信号的方法 。 发射机数字信号处理器（Tx DSP），在通过模拟信道发送数据信号之前，将第一适应功能应用于数据信号。 接收机数字信号处理器（Rx DSP），将第二适配功能应用于通过模拟通道接收的数据信号。 选择第一和第二适配功能以协同地减轻由模拟通道施加的窄带损伤的影响。