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1. 发明公开

EP1645093A1 CHANNEL ESTIMATION AND SEQUENCE ESTIMATION FOR THE RECEPTION OF OPTICAL SIGNAL 有权
标题翻译：信道估计和序列的估计值用于接收光信号
公开(公告)号：EP1645093A1
公开(公告)日：2006-04-12
申请号：EP04740522.0
申请日：2004-07-01
申请人： Langenbach, Stefan , Stojanovic, Nebojsa , CoreOptics, Inc., c/o The Corporation Trust Center
发明人： LANGENBACH, Stefan , STOJANOVIC, Nebojsa
IPC分类号： H04L25/03
CPC分类号： H04L25/03197 , H04L7/0004 , H04L7/007
摘要： The invention relates to a method for channel estimation. The method comprises digitizing an analog signal representing a sequence of symbols thereby associating one digital word out to the level of said analog signal at each sampling time. The most likely sequence of said symbols is detected. To this end branch metrics are provided. According to one embodiment, a symbol period comprises at least two sampling times. Moreover, the branch metrics are obtained from frequencies of digital words resulting from a digitizing and the symbols of the most likely sequence. According to another embodiment, a symbol period comprises at least one sampling time. Events are counted wherein each event is defined by a channel state and a current digital word. Each channel state is defined by a pattern of symbols relative to a current symbol determined at the time of a current digital word. A model distribution is fitted to event counts and a branch metrics is obtained from the fitted model distribution. Moreover, the invention relates to corresponding symbol detectors for optical receivers.

2. 发明申请

WO2021249650A1 A DEVICE AND A METHOD FOR CANCELLING NOISE IN A COMMUNICATION SYSTEM 审中-公开
公开(公告)号：WO2021249650A1
公开(公告)日：2021-12-16
申请号：PCT/EP2020/066259
申请日：2020-06-12
申请人： HUAWEI TECHNOLOGIES CO., LTD. , STOJANOVIC, Nebojsa
发明人： STOJANOVIC, Nebojsa
IPC分类号： H04L25/03 , H04B1/10 , H04B1/1027 , H04L25/03006
摘要： The invention relates to a device and a method for processing a plurality of input samples being affected by noise and cancelling the noise for these input samples. The device is configured to buffer a first and a second input sample among the plurality of input samples, and to determine a first and a second decision sample representing the first and second input sample, respectively. After obtaining the first and second decision samples, the device is configured to determine a first and a second noise sample from a difference between the input sample and the decision sample. Further, the device determines a sign pattern comprising a sign of the first and a sign of the second decision sample and a first and second processed noise sample is obtained. Finally, the device superimposes the first and the second processed noise sample to obtain a noise-cancelled sample.

3. 发明申请

WO2020020463A1 AUXILIARY CHANNEL IN PAM/QAM SYSTEMS USING REDUNDANT CONSTELLATION POINTS 审中-公开
公开(公告)号：WO2020020463A1
公开(公告)日：2020-01-30
申请号：PCT/EP2018/070314
申请日：2018-07-26
申请人： HUAWEI TECHNOLOGIES CO., LTD. , STOJANOVIC, Nebojsa
发明人： STOJANOVIC, Nebojsa , ZHANG, Liang , PRODANIUC, Cristian , WEI, Jinlong , XIE, Changsong
IPC分类号： H04B10/54 , H04L27/34
摘要： An optical communication system that comprises a transmitter adapted to generate a signal by modulating a transmission data as low power consumption symbols of an amplitude modulation format and a monitoring data (MD) as high power consumption symbols of the amplitude modulation format, the MD comprising at least one transmitter parameter and/or at 5 least one receiver parameter of communicating the transmission data. A binary logarithm of a total number of the low power consumption symbols and the high power consumption symbols is a non-integer.

4. 发明申请

WO2019001686A1 PULSE AMPLITUDE MODULATION LEVEL OPTIMIZATION AND EQUALIZATION IN OPTICAL SYSTEMS 审中-公开
公开(公告)号：WO2019001686A1
公开(公告)日：2019-01-03
申请号：PCT/EP2017/065767
申请日：2017-06-27
申请人： HUAWEI TECHNOLOGIES CO., LTD. , STOJANOVIC, Nebojsa
发明人： STOJANOVIC, Nebojsa
IPC分类号： H04B10/54 , H04B10/588 , H04B10/69
摘要： An optical communication system includes a transmission side system for multi-level PAM and a corresponding receiver side system. The transmission side comprises a laser source (50) providing an optical beam (52), a signal source of electircal signals (56) to be modulated onto said optical beam; and a modulator (54) connected to the laser source (50) and the signal source, to modulate said electrical signals (56) onto said optical beam (50) using amplitude modulation and at least four signal levels, wherein the at least four signal levels are non-uniformly distributed. The receiver side includes a corresponding equalizer which may be implemented as a filter of the form f 1y + f 2y 2 + F 0

5. 发明申请

WO2016012036A1 TIMING RECOVERY IN DIRECT-DETECTION MLSE RECEIVERS 审中-公开
标题翻译：直接检测接收器的定时恢复
公开(公告)号：WO2016012036A1
公开(公告)日：2016-01-28
申请号：PCT/EP2014/065666
申请日：2014-07-22
申请人： HUAWEI TECHNOLOGIES CO.,LTD , STOJANOVIC, Nebojsa , XIE, Changsong
发明人： STOJANOVIC, Nebojsa , XIE, Changsong
IPC分类号： H04L7/00 , H03L7/087
CPC分类号： H04L7/0029 , H03L7/235 , H04L7/0062 , H04L7/0335
摘要： A timing recovery apparatus for receivers is disclosed. The apparatus includes a feedback loop with two parallel branches, each branch having an interpolation filter and a phase detector. The feedback loop additionally includes a combiner to combine a signal from each of the branches.
摘要翻译：公开了一种用于接收机的定时恢复装置。该装置包括具有两个并行分支的反馈回路，每个分支具有内插滤波器和相位检测器。反馈回路还包括组合器以组合来自每个分支的信号。

6. 发明申请

WO2014194940A1 COHERENT OPTICAL RECEIVER 审中-公开
标题翻译：相关光接收机
公开(公告)号：WO2014194940A1
公开(公告)日：2014-12-11
申请号：PCT/EP2013/061533
申请日：2013-06-05
申请人： HUAWEI TECHNOLOGIES CO., LTD. , STOJANOVIC, Nebojsa
发明人： STOJANOVIC, Nebojsa
IPC分类号： H04L7/00 , H04B10/61
CPC分类号： H04L7/0029 , H04B10/616
摘要： The invention relates to a coherent optical receiver (800), comprising: analog-to-digital conversion means (801) configured for sampling an analog coherent optical signal (802) into a digital coherent optical signal (804); channel equalization means (803) configured for equalizing the digital coherent optical signal (804); channel transfer function calculation means (801) configured for calculating a channel transfer function (808) based on the digital coherent optical signal (804) and the equalized digital coherent optical signal (801) interpolated by interpolation means (807a, 807b) and configured for adjusting the channel equalization means (803) based on the calculated channel transfer function (808); phase detection means (809) configured for providing a timing error detection characteristic, TEDC, signal (810), based on the equalized digital coherent optical signal (806); feed- backward timing recovery means (811) configured for adjusting the sampling of the analog-to-digital conversion means (801) based on the TEDC signal (810) with respect to a frequency offset compensation criterion; and feed-forward timing recovery means (813) configured for adjusting the interpolation means (807a, 807b) with respect to a phase offset compensation criterion.
摘要翻译：本发明涉及一种相干光接收机（800），包括：模拟 - 数字转换装置（801），被配置为将模拟相干光信号（802）采样成数字相干光信号（804）; 通道均衡装置（803），用于均衡数字相干光信号（804）; 信道传递函数计算装置（801），被配置为基于由内插装置（807a，807b）内插的数字相干光信号（804）和均衡数字相干光信号（801）来计算信道传递函数（808）基于所计算的信道传递函数（808）来调整信道均衡装置（803）; 相位检测装置（809），被配置为基于均衡的数字相干光信号（806）提供定时误差检测特性TEDC，信号（810）; 反馈定时恢复装置（811），被配置为基于相对于频率偏移补偿标准的TEDC信号（810）来调整模数转换装置（801）的采样; 以及配置用于相对于相位偏移补偿标准调整内插装置（807a，807b）的前馈定时恢复装置（813）。

7. 发明申请

WO2014032711A1 METHOD AND DEVICE FOR PERFORMANCE EVALUATION OF FORWARD ERROR CORRECTION (FEC) CODES 审中-公开
标题翻译：用于前向纠错（FEC）编码的性能评估的方法和装置
公开(公告)号：WO2014032711A1
公开(公告)日：2014-03-06
申请号：PCT/EP2012/066790
申请日：2012-08-29
申请人： HUAWEI TECHNOLOGIES CO., LTD. , STOJANOVIC, Nebojsa , YU, Zhao
发明人： STOJANOVIC, Nebojsa , YU, Zhao
IPC分类号： H03M13/01
CPC分类号： G06F11/079 , H03M13/015 , H03M13/116 , H03M13/118 , H03M13/1515 , H03M13/152 , H03M13/2906
摘要： Method for evaluating the performance of different forward error correction codes in communication systems which require low bit error rates, in particular in optical transmission systems, comprising: receiving from a transmission channel uncoded data symbols; separating a codeword vector and a noise vector, so that the noise vector is dependent on the transmitted data when non-linear effects occur; encoding known data bits using a parity check matrix of the code to obtain parity symbols; adding the noise vector to the encoded bits; and providing the performance of the forward error correction for ex¬ ample by counting errors.
摘要翻译：特别是在光传输系统中，用于评估需要低误码率的通信系统中的不同前向纠错码的性能的方法，包括：从传输信道接收未编码的数据符号; 分离码字向量和噪声向量，使得当出现非线性效应时，噪声向量依赖于所发送的数据; 使用代码的奇偶校验矩阵对已知数据位进行编码以获得奇偶校验符号; 将噪声向量加到编码比特; 并通过计数错误提供前向纠错的执行。

8. 发明申请

WO2013083190A1 METHOD FOR RECOVERING CLOCK INFORMATION FROM A RECEIVED OPTICAL SIGNAL 审中-公开
标题翻译：从收到的光信号中恢复时钟信息的方法
公开(公告)号：WO2013083190A1
公开(公告)日：2013-06-13
申请号：PCT/EP2011/072047
申请日：2011-12-07
申请人： HUAWEI TECHNOLOGIES CO., LTD. , STOJANOVIC, Nebojsa
发明人： STOJANOVIC, Nebojsa
IPC分类号： H04L7/027 , H04B10/61 , H04B10/25
CPC分类号： H04L7/027 , H04B10/6161 , H04L7/0335
摘要： The invention relates to a method (100) for recovering clock information from a received optical signal, the received optical signal having a first (x) and a second (y) principal state of polarization. The method comprises modifying (101) the first and the second principal state of polarization according to an optimization criterion and detecting (103) the clock information based on the modified first and second principal states of polarization.
摘要翻译：本发明涉及一种用于从接收的光信号中恢复时钟信息的方法（100），所接收的光信号具有第一（x）和第二（y）主要的偏振态。该方法包括根据优化标准修改（101）第一和第二主要极化状态，并且基于修改的第一和第二主要偏振态检测（103）时钟信息。

9. 发明申请

WO2011156124A1 METHODS FOR OBTAINING A SET OF PATH METRICS AND EQUALIZER FOR A RECEIVER FOR DIGITAL DATA 审中-公开
标题翻译：用于获取数字数据接收器的路径度量和均衡器的方法
公开(公告)号：WO2011156124A1
公开(公告)日：2011-12-15
申请号：PCT/US2011/037531
申请日：2011-05-23
申请人： CISCO TECHNOLOGY, INC. , LANGENBACH, Stefan , STOJANOVIC, Nebojsa
发明人： LANGENBACH, Stefan , STOJANOVIC, Nebojsa
IPC分类号： H04L25/03
CPC分类号： H04L25/03178 , H04L25/03248
摘要： This invention relates to methods for obtaining a bin number of path metrics. When performing such methods, a histogram is provided, which comprises a bin number of values, a maximum value and a tail region left or right of the maximum value. A bin number of path metrics is obtained from said values. According to an embodiment a local extremum is removed from said tail region. According to another embodiment the tail region is forced to be convex. According to a further embodiment a maximum metric difference between neighboring metrics is ensured.
摘要翻译：本发明涉及获取路数量度的箱数的方法。当执行这种方法时，提供直方图，其包括最大值的左边或右边的值的数量，最大值和尾部区域。从所述值获得二进制数的路径度量。根据实施例，从所述尾部区域移除局部极值。根据另一个实施例，尾部区域被迫凸起。根据另一实施例，确保相邻度量之间的最大度量差异。

10. 发明申请

WO2005011220A8 CHANNEL ESTIMATION AND SEQUENCE ESTIMATION FOR THE RECEPTION OF OPTICAL SIGNAL 审中-公开
标题翻译：光信号接收的信道估计和序列估计
公开(公告)号：WO2005011220A8
公开(公告)日：2005-03-24
申请号：PCT/EP2004007155
申请日：2004-07-01
申请人： LANGENBACH STEFAN , STOJANOVIC NEBOJSA , COREOPTICS INC
发明人： LANGENBACH STEFAN , STOJANOVIC NEBOJSA
IPC分类号： H04L25/03
CPC分类号： H04L25/03197 , H04L7/0004 , H04L7/007
摘要： The application relates to channel estimation. The method comprises digitizing an analogue signal representing a sequence of symbols thereby associating one digital word with the level of said analogue signal at each sampling time. The most likely sequence of symbols is detected. To this end branch metrics are provided. According to one embodiment, a symbol period comprises at least two sampling times. Moreover the branch metrics are obtained from frequencies of digital words resulting from a digitizing and the symbols of the most likely sequence. According to another embodiment a symbol period comprises at least one sampling time. Events are counted wherein each event is defined by a channel state and a current digital word. Each channel state is defined by a pattern of symbols relative to a current symbol determined at the time of a current digital word. A model distribution is fitted to event counts and a branch metrics is obtained from the fitted model distribution. Moreover the invention relates to corresponding symbol detectors for optical receivers.
摘要翻译：该应用涉及信道估计。该方法包括数字化表示一系列符号的模拟信号，由此在每个采样时间将一个数字字与所述模拟信号的电平相关联。检测到最可能的符号序列。为此提供了分支指标。根据一个实施例，符号周期包括至少两个采样时间。此外，分支度量是从数字化产生的数字字的频率和最可能的序列的符号中获得的。根据另一个实施例，符号周期包括至少一个采样时间。事件被计数，其中每个事件由信道状态和当前数字字定义。每个信道状态由相对于当前数字字时确定的当前符号的符号模式定义。模型分布符合事件计数，分支度量从拟合模型分布中获得。此外，本发明涉及用于光接收机的对应符号检测器。

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