知搜-全球专利检索

  1. 登录
  2. 注册

搜索结果

7 条记录 (耗时 0.013 秒)

    Training-aided feedforward channel equalization
    4.
    发明授权
    Training-aided feedforward channel equalization 有权

    公开(公告)号：US10938483B1

    公开(公告)日：2021-03-02

    申请号：US16903792

    申请日：2020-06-17

    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： H04B10/61 ,  H04B10/69

    摘要： An optical signal modulated with a stream of symbols comprising a sequence of training symbols is received at a receiver. First equalizer circuitry calculates and applies first coefficients to digital signals representative of the optical signal, thereby resulting in first compensated signals. Second equalizer circuitry calculates second coefficients based on a correlation between the first compensated signals and digital signals representative of the sequence of training symbols and applies the second coefficients to the first compensated signals, thereby resulting in second compensated signals. Third equalizer circuitry calculates and applies third coefficients to the second compensated signals, thereby resulting in third compensated signals. The first, second, and third coefficients compensate for impairments in the optical signal varying at respective first, second, and third rates, where the third rate is higher than the first rate and lower than the second rate.

    Approximation of recursive least squares equalization
    6.
    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
    7.
    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