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公开(公告)号：US10938483B1
公开(公告)日：2021-03-02
申请号：US16903792
申请日：2020-06-17
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.
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公开(公告)号：US11239929B1
公开(公告)日：2022-02-01
申请号：US17203332
申请日：2021-03-16
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.
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公开(公告)号：US11233568B1
公开(公告)日：2022-01-25
申请号：US17090135
申请日：2020-11-05
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
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公开(公告)号：US11817873B1
公开(公告)日：2023-11-14
申请号：US17741139
申请日：2022-05-10
CPC分类号： H03M1/0617
摘要： A digital-to-analog converter (DAC) comprises circuitry configured to generate, based on a mapping, L signals representing an N-bit digital input, wherein N and L are positive integers, and wherein N
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公开(公告)号：US11876525B2
公开(公告)日：2024-01-16
申请号：US17741152
申请日：2022-05-10
IPC分类号： H03M1/06
CPC分类号： H03M1/0602
摘要： An apparatus comprises circuitry configured to generate a predicted error signal by applying to a digital signal a distortion model characterized by parameters configured to model circuit component mismatches in a digital-to-analog converter (DAC), circuitry configured to generate a pre-compensated digital signal using the digital signal and the predicted error signal, and circuitry configured to provide the pre-compensated digital signal to the DAC for conversion into an analog signal.
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公开(公告)号：US11201695B2
公开(公告)日：2021-12-14
申请号：US17226287
申请日：2021-04-09
摘要： A method performed at an electronic device comprises receiving information bits, a first nub, and a second nub, each nub comprising redundant values; calculating first calculated determiners from first subsets of the information bits along a first dimension; calculating first corrected determiners by applying first FEC decoding to a combination of the first calculated determiners and the first nub; correcting at least one error in the information bits using a difference between the first corrected determiners and the first calculated determiners; calculating second calculated determiners from second subsets of the information bits along a second dimension that differs from the first dimension; calculating second corrected determiners by applying second FEC decoding to a combination of the second calculated determiners and the second nub; and correcting at least one additional error in the information bits using a difference between the second corrected determiners and the second calculated determiners.
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公开(公告)号：US11126219B2
公开(公告)日：2021-09-21
申请号：US16599678
申请日：2019-10-11
摘要： A receiver apparatus comprises circuitry configured for storing a first sequence of values. At the receiver apparatus, a communications signal is received which conveys a second sequence of values, the second sequence of values being related to the first sequence of values. According to some examples, the second sequence of values is identical to the first sequence of values. At the receiver apparatus, P results are calculated from a cross-correlation of the first sequence of values with at least a portion of a representation of the communications signal, where P is a positive integer. According to some examples, P≥2. An estimate of a phase offset of a continuous clock is calculated as a function of the P results. According to some examples, the function is a non-linear function. The estimate of the clock phase offset may be used to achieve clock recovery at the receiver apparatus.
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公开(公告)号：US11038599B1
公开(公告)日：2021-06-15
申请号：US17064910
申请日：2020-10-07
IPC分类号： H04B10/00 , H04B10/61 , H04B17/391
摘要： A receiver applies first processing to a digital representation of a received signal to generate a first processed signal having first additive noise and first linear inter-symbol interference (ISI), the first processing comprising a substantially linear operation designed to substantially minimize a sum of variances of the first additive noise and the first linear ISI. The receiver applies second processing to the first processed signal to generate a second processed signal having second additive noise and second linear ISI, the second processing comprising a substantially nonlinear operation designed (i) to make a variance of the second additive noise substantially lower than the variance of the first additive noise, and (ii) to make a sum of the variance of the second additive noise and a variance of the second linear ISI substantially lower than the sum of the variances of the first additive noise and first linear ISI.
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9.发明授权Optical modulation schemes having reduced nonlinear optical transmission impairments 有权具有降低的非线性光传输损伤的光调制方案公开(公告)号：US09143238B2
公开(公告)日：2015-09-22
申请号：US13969694
申请日：2013-08-19
申请人： Kim B. Roberts , Maurice O'Sullivan , Mahmoud Taherzadehboroujeni , Shahab Oveis Gharan , Andrew D. Shiner , Michael Andrew Reimer
发明人： Kim B. Roberts , Maurice O'Sullivan , Mahmoud Taherzadehboroujeni , Shahab Oveis Gharan , Andrew D. Shiner , Michael Andrew Reimer
IPC分类号： H04B10/04 , H04B10/00 , H04B10/532 , H04B10/516
CPC分类号： H04B10/532 , H04B10/516
摘要： A method of transmitting a data signal using an optical transmitter of an optical communications system. The optical transmitter is configured to modulate an optical carrier in successive signalling intervals to generate an optical signal. A modulation scheme is provided which comprises a multi-dimensional symbol constellation. The modulation scheme is designed such that an average degree of polarization of a modulated optical signal output from the optical transmitter has a first value when averaged across a first signaling interval, and has a second value when averaged across more than one and fewer than 100 signaling intervals. The second value is less than 10 percent of the first value. During run-time, an encoder of the optical transmitter encoding a data signal to be transmitted as symbols of the constellation, and a modulator of the optical transmitter modulating available dimensions of the optical carrier in accordance with the symbols.
摘要翻译： 一种使用光通信系统的光发射机发送数据信号的方法。 光发射机被配置为在连续的信令间隔中调制光载波以产生光信号。 提供了一种包括多维符号星座的调制方案。 调制方案被设计成使得当从第一信令间隔平均时，从光发送器输出的调制光信号的平均偏振度具有第一值，并且当平均多于一个且少于100个信令时具有第二值 间隔 第二个值小于第一个值的10％。 在运行时间期间，光发送器的编码器编码要作为星座符号发送的数据信号，以及根据符号调制光载波的可用尺寸的光发射机的调制器。
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公开(公告)号：US09088387B2
公开(公告)日：2015-07-21
申请号：US13949627
申请日：2013-07-24
CPC分类号： H04L1/00 , H03M13/1515 , H03M13/251 , H03M13/6325
摘要： A method of recovering a value of a symbol received through an optical communications system. A multi-bit estimate of the symbol is subdivided into a first part and a second part, each part including at least one respective bit of the estimate. A most likely value of the first part is detected. The most likely value of the first part is processed using a Forward Error Correction (FEC) decoder to generate a corrected first part value, which is used to detect a most likely value of the second part. The most likely value of the second part is then processed by the FEC decoder to generate a corrected second part, which is combined with the corrected first part to recover the value of the symbol.
摘要翻译： 一种恢复通过光通信系统接收的符号的值的方法。 符号的多位估计被细分为第一部分和第二部分，每个部分包括估计的至少一个相应位。 检测到第一部分的最有可能的值。 使用前向纠错（FEC）解码器处理第一部分的最可能的值，以产生校正的第一部分值，其用于检测第二部分的最可能的值。 然后由FEC解码器处理第二部分的最可能的值，以产生校正的第二部分，其与校正的第一部分组合以恢复符号的值。
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