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1. 发明授权

US09871622B2 Method for increasing the probability of error correction in an optical communication channel 有权
公开(公告)号：US09871622B2
公开(公告)日：2018-01-16
申请号：US14662593
申请日：2015-03-19
申请人： MULTIPHY LTD.
发明人： Omri Levy , Udi Barzilai
IPC分类号： H04L1/00 , H04J14/08 , H04B10/27 , H03M13/00 , H04L25/03 , H04L25/14 , H03M13/15 , H03M13/27
CPC分类号： H04L1/0042 , H03M13/1515 , H03M13/27 , H04B10/27 , H04L1/0041 , H04L1/0071 , H04L25/03057 , H04L25/14
摘要： A method for improving the resilience of a communication channel (such as an optical communication channel) to correlated errors (e.g., burst errors), the channel is being formed by a time-multiplexed aggregation of a plurality of lower rate constituent lanes and employs a Forward Error-Correction (FEC) mechanism for forming codewords from data carried by the constituent lanes. Accordingly, the distribution of errors among the codewords is modified by introducing, at the transmitter side, specific delays to the transmission times via the constituent lanes, relative to each other.

2. 发明申请

US20170054510A1 ELECTRO-OPTICAL FINITE IMPULSE RESPONSE TRANSMIT FILTER 审中-公开
标题翻译：电光有源脉冲响应发射滤波器
公开(公告)号：US20170054510A1
公开(公告)日：2017-02-23
申请号：US15238608
申请日：2016-08-16
申请人： MULTIPHY LTD.
发明人： Anthony Eugene ZORTEA , Dan SADOT , Russell ROMANO
IPC分类号： H04B10/516 , H03H21/00
CPC分类号： H04B10/516 , H04B10/2507
摘要： An electro-optical FIR transmit filter comprising a segmented MZM including a plurality of MZM segments, for receiving an input optical traveling wave to be filtered; an electrical field driver, for applying a controlled electrical field required for modulation of each MZM using a control signal which controls the electrical field; delay cells associated with at least one MZM, for aligning the control signal with a travelling optical wave; and at least one electrical xT delay cell representing a filter delay, for electrically adjusting the timing of the control signal. The FIR filter's coefficients are implemented in the optical domain by determining the amount of MZM segments driven by each xT delay cell, with respect to the total number of MZM segments.
摘要翻译：一种电光FIR发射滤波器，包括包含多个MZM段的分段MZM，用于接收要滤波的输入光行波; 电场驱动器，用于使用控制电场的控制信号施加用于调制每个MZM所需的受控电场; 与至少一个MZM相关联的延迟单元，用于使控制信号与行进光波对齐; 以及表示滤波器延迟的至少一个电xT延迟单元，用于电调节控制信号的定时。 FIR滤波器的系数通过确定由每个xT延迟单元驱动的MZM段相对于MZM段的总数来实现在光域中。

3. 发明申请

US20170026284A1 SEAMLESS MATCH POINT SWITCHING IN MLSE-BASED MODEMS 有权
标题翻译：基于MLSE的模式的无缝匹配点切换
公开(公告)号：US20170026284A1
公开(公告)日：2017-01-26
申请号：US15213809
申请日：2016-07-19
申请人： MULTIPHY LTD.
发明人： Omri LEVY , Hanan LEIZEROVICH , Yaron BEBES , Nir SHEFFI
IPC分类号： H04L12/721 , H04L1/20 , H04L12/801 , H04L12/26 , H04L5/00
CPC分类号： H04L1/203 , H04L5/006 , H04L25/03178
摘要： Method and system for providing seamless match point switching in an adaptive decoder (e.g., an MLSE decoder) that is based on estimation of symbol sequences, according to which statistics regarding samples corresponding to different symbol sequences in alternative match points are collected by a statistics collector, to create a set of figures of merit representing the quality of each alternative match point, while different match points are obtained by changing the delay of symbols decoded by the adaptive decoder and samples entering the statistics collector. A figure of merit of the current match point is compared to the figure of merit of alternative match points. Whenever an alternative match point figure of merit is better than the current match point by a predefined threshold, a decision to switch to the alternative match point is made. Seamless switching to the alternative match point is performed by shifting the sampling phase forward or backward, until obtaining better performance, while performing adaptation of the decoder to the sampling phase shift.
摘要翻译：用于在基于符号序列的估计的自适应解码器（例如，MLSE解码器）中提供无缝匹配点切换的方法和系统，根据该方法和系统，与备选匹配点中的不同符号序列相对应的样本的统计信息由统计收集器，以创建表示每个替代匹配点的质量的一组品质因数，而通过改变由自适应解码器解码的符号的延迟和进入统计收集器的样本来获得不同的匹配点。将当前匹配点的品质因数与替代匹配点的品质因数进行比较。每当一个替代匹配点的品质因数比当前匹配点更好的预定阈值时，就进行切换到替代匹配点的决定。通过将采样相位向前或向后移位直到获得更好的性能，同时执行解码器到采样相移的调整来执行对替代匹配点的无缝切换。

4. 发明授权

US09485121B2 Digital baud rate clock recovery of heavily ISI-induced signals 有权
标题翻译：数字波特率时钟恢复严重的ISI诱发信号
公开(公告)号：US09485121B2
公开(公告)日：2016-11-01
申请号：US14605199
申请日：2015-01-26
申请人： Multiphy Ltd.
发明人： Guy Dorman , Dan Sadot , Albert Gorshtein
IPC分类号： H03H7/30 , H04L25/03 , H04L25/49
CPC分类号： H04L25/03076 , H04L25/4917 , H04L2025/0342 , H04L2025/03636
摘要： System and method for digitally equalizing a data channel having wide channel impulse response for clock recovery of heavily ISI-induced received signals operating at one sample per symbol, according to which the received signal is pre-processed to provide a received signal with modified constellation, which is pre-processed for the decision process of signal with Inter-Symbol Interference by introducing controlled ISI to the received signal. The decision process is performed, based on a higher order vocabulary according to the introduced controlled ISI.
摘要翻译：用于对具有宽信道脉冲响应的数据信道进行数字均衡的系统和方法，用于对每个符号一个样本进行操作的大量ISI诱发的接收信号的时钟恢复，根据该信号对接收信号进行预处理以提供具有修改的星座图的接收信号，其通过将受控ISI引入到接收信号中而被预处理用于具有符号间干扰的信号的判定处理。根据引入的受控ISI，基于较高阶的词汇表执行决策过程。

5. 发明授权

US10129053B2 Steepest descent FFE computation and tracking 有权
公开(公告)号：US10129053B2
公开(公告)日：2018-11-13
申请号：US15166654
申请日：2016-05-27
申请人： MULTIPHY LTD.
发明人： Or Vidal
IPC分类号： H04L27/18 , H04L25/03
摘要： A nonlinear equalizer for iteratively equalizing a data communication channel, which comprises a transmitter at the input of the channel, for transmitting data and one or more training sequences over the channel; a receiver at the output of the channel, for receiving the data and the one or more training sequences; a sampling circuit for sampling received data; a processor, for processing the samples. The processor is adapted to calculate the derivative of the MSE for each of the FFE taps; calculate the derivative of the variance of the enhanced noise with the FFE taps; iteratively update the FFE coefficients, while during each update, injecting samples of a known training sequence into the channel. During each update, the processor computes the derivative of the output noise variance, by applying convolution between the noise correlation and the current FFE taps; computes the effective channel and the modified effective channel; computes the derivative of the residual ISI, by applying correlation between the original channel h and the modified effective channel; and updates the FFE coefficients, with a step proportional to the opposite of the gradient.

6. 发明授权

US09948435B2 Seamless match point switching in MLSE-based modems 有权
公开(公告)号：US09948435B2
公开(公告)日：2018-04-17
申请号：US15213809
申请日：2016-07-19
申请人： MULTIPHY LTD.
发明人： Omri Levy , Hanan Leizerovich , Yaron Bebes , Nir Sheffi
IPC分类号： H04B1/00 , H04L1/20 , H04L5/00 , H04L25/03
CPC分类号： H04L1/203 , H04L5/006 , H04L25/03178
摘要： Method and system for providing seamless match point switching in an adaptive decoder (e.g., an MLSE decoder) that is based on estimation of symbol sequences, according to which statistics regarding samples corresponding to different symbol sequences in alternative match points are collected by a statistics collector, to create a set of figures of merit representing the quality of each alternative match point, while different match points are obtained by changing the delay of symbols decoded by the adaptive decoder and samples entering the statistics collector. A figure of merit of the current match point is compared to the figure of merit of alternative match points. Whenever an alternative match point figure of merit is better than the current match point by a predefined threshold, a decision to switch to the alternative match point is made. Seamless switching to the alternative match point is performed by shifting the sampling phase forward or backward, until obtaining better performance, while performing adaptation of the decoder to the sampling phase shift.

7. 发明授权

US09608735B2 MIMO equalization optimized for baud rate clock recovery in coherent DP-QPSK metro systems 有权
公开(公告)号：US09608735B2
公开(公告)日：2017-03-28
申请号：US14643746
申请日：2015-03-10
申请人： MULTIPHY LTD.
发明人： Albert Gorshtein , Guy Dorman , Dan Sadot
IPC分类号： H04B10/00 , H04B10/61 , H04B10/2575 , H04J14/06 , H04B10/40 , H04L27/18 , H04L25/03 , H04B7/0413 , H04L7/00 , H04L27/20
CPC分类号： H04B10/6166 , H04B7/0413 , H04B10/2575 , H04B10/40 , H04J14/06 , H04L7/0062 , H04L25/03 , H04L25/03114 , H04L25/03968 , H04L27/18 , H04L27/2096
摘要： The present invention is directed to a MIMO equalization system and method, optimized for baud rate clock recovery in coherent symbol-spaced DP-QPSK Metro systems. According to this method, the Mueller & Muller timing function is extended to cope with controlled ISI induced signals, while decoupling between MIMO equalization and clock recovery loops, using a midpoint output of the equalizer for timing estimation, instead of its final output. At least a portion of controlled Inter-Symbol Interference (ISI) is kept intact and the controlled ISI is compensated by an MLSE, right after carrier timing synchronization.

8. 发明申请

US20170019219A1 EYE DIAGRAM ESTIMATION, BASED ON SIGNAL STATISTICS COLLECTION 有权
标题翻译：基于信号统计收集的眼图估计
公开(公告)号：US20170019219A1
公开(公告)日：2017-01-19
申请号：US15210835
申请日：2016-07-14
申请人： MULTIPHY LTD.
发明人： Hanan LEIZEROVICH
IPC分类号： H04L1/20
CPC分类号： H04L1/205 , H04L1/244
摘要： Method and system for estimating an eye diagram display of a real signal passing through a data communication channel, according to which decoded symbols of the transmitted real signal are captured, along with their corresponding ADC sample values and sampled at a rate of 1 SPS or more. Then statistic data is collected for each captured sequence of bits/symbols for each particular phase and a synthetic signal is created, based on the collected statistics, using a signal generator that produces samples by randomly creating a bit stream by generating a corresponding one or more samples for any symbol sequences in the bit stream according to the number of collected phases. Interpolation on the corresponding samples is then performed, according to required display time resolution and the synthetic signal is then displayed as a two-dimensional eye diagram image, representing all the statistics collected at all phases.
摘要翻译：用于估计通过数据通信信道的实际信号的眼图显示的方法和系统，根据其发送的实信号的解码符号及其对应的ADC采样值，并以1 SPS或更多的速率采样。然后针对每个特定阶段的每个捕获的比特/符号序列收集统计数据，并且基于所收集的统计信息，使用信号发生器创建合成信号，所述信号发生器通过随机地产生比特流而产生样本，生成对应的一个或多个根据收集阶段的数量，比特流中的任何符号序列的样本。然后根据所需的显示时间分辨率对相应样本进行插值，然后将合成信号显示为二维眼图图像，代表所有阶段收集的所有统计信息。

9. 发明申请

US20160359644A1 FRAMING SCHEME FOR CONTINUOUS OPTICAL TRANSMISSION SYSTEMS 有权
标题翻译：连续光传输系统的框架方案
公开(公告)号：US20160359644A1
公开(公告)日：2016-12-08
申请号：US15175968
申请日：2016-06-07
申请人： MULTIPHY LTD.
发明人： Or VIDAL
IPC分类号： H04L25/03 , H04B10/27 , H04L5/00 , H04L1/06 , H04B10/58 , H04B10/66
CPC分类号： H04L25/03019 , H04B10/2507 , H04B10/27 , H04B10/58 , H04B10/66 , H04L25/0228 , H04L25/03114 , H04L25/03146
摘要： An optical communication system with nonlinear equalization capability for equalizing distortions of a data communication channel, which comprises a processor for periodically gathering a predetermined number of consecutive data segments from an input data stream to a group and adding a known pilot sequence to the group, thereby forming a data frame; an optical transmitter at the input of the channel, for transmitting the data frames to a receiver, over the channel; a receiver at the output of the channel, for detecting the transmitted frames, the receiver including a demodulator. The demodulator is adapted to recover the pilot sequence of each frame; compare each recovered pilot sequence which its corresponding original transmitted pilot sequence; extract the current Channel State Information indicative of changes in the channel distortion, using the comparison results; use changes in the Channel State Information for updating the coefficients of the estimator and of the equalizer, every time a frame is received; and equalize the channel estimator and of said equalizer, every time a frame is received; and equalize the channel using the equalizer coefficients, and based on the current Channel State Information.
摘要翻译：一种具有用于均衡数据通信信道失真的非线性均衡能力的光通信系统，其包括用于从输入数据流周期性地收集预定数量的连续数据段到组并将已知导频序列添加到组的处理器，由此形成数据帧; 在信道的输入处的光发射机，用于通过信道将数据帧发射到接收机; 在信道的输出处的接收机，用于检测所发送的帧，所述接收机包括解调器。解调器适于恢复每帧的导频序列; 比较其对应的原始发送导频序列的每个恢复的导频序列; 使用比较结果提取当前信道状态信息，指示信道失真的变化; 在每次接收到帧时，使用信道状态信息中的改变来更新估计器和均衡器的系数; 并且每当接收到帧时，均衡所述信道估计器和所述均衡器; 并使用均衡器系数对信道进行均衡，并且基于当前信道状态信息。

10. 发明授权

US09680489B2 Background calibration of sampler offsets in analog to digital converters 有权
公开(公告)号：US09680489B2
公开(公告)日：2017-06-13
申请号：US15280963
申请日：2016-09-29
申请人： MULTIPHY LTD.
发明人： Anthony Eugene Zortea , Russell Romano
IPC分类号： H03M1/10 , H03M1/12
CPC分类号： H03M1/1023 , H03M1/1004 , H03M1/1245 , H03M1/361
摘要： A method for background calibration of sampler offsets in an Analog to Digital Converter (ADC), according to which one of the samplers of the ADC is established as a reference sampler, whose threshold and timing offsets will be the criterion for adjusting threshold offsets and timing offsets of all other samplers. Then each of the other samplers of the ADC, one at a time, is calibrated by selecting an uncalibrated sampler and establishing it as the current Sampler Under Calibration (SUC); disregarding contribution of the SUC to the output of the ADC; adjusting the threshold of the SUC to be identical to the threshold of the reference sampler; performing one-bit cross-correlation between the reference sampler and the SUC; establishing an error surface representing the threshold offset and timing offset of the SUC with respect to the reference sampler; adjusting the threshold and the timing of the SUC to be equal to the threshold and timing of the reference sampler; restoring level of the SUC to its original threshold with respect to the overall ADC and restoring contribution of the SUC to the output of the ADC.

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