公开(公告)号：WO2018053820A1

公开(公告)日：2018-03-29

申请号：PCT/CN2016/100002

申请日：2016-09-24

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： ZAMANI, Mahdi ,  TORBATIAN, Mehdi ,  MITRA, Jeebak ,  ZHANG, Zhuhong ,  LI, Chuandong

IPC: H04B10/61

CPC classification number: H04L7/0075 ,  H04B10/60 ,  H04B10/613 ,  H04B10/6161 ,  H04B10/6166 ,  H04L7/0029 ,  H04L7/0278

Abstract: The optical channel between a coherent optical transmitter and a coherent optical receiver may include one or more components that act as a bandpass filter with a passband that is narrower than the signal bandwidth. Such a narrow filter may significantly attenuate the signal content close to the band edge of the data signal. As a result, timing error detection may work less effectively, and therefore clock recovery may be less effective or fail. Methods and systems are disclosed in which a single optical carrier is used to transmit a data signal that has multiple bands, and timing error detection is performed at the receiver using one or more inner bands of the multiple bands. The timing error detection may therefore be made more robust to the effects of the narrow filtering.

Abstract translation: 相干光发射器和相干光接收器之间的光通道可以包括一个或多个充当带通滤波器的部件，其通带窄于信号带宽。 这种窄的滤波器可能会显着衰减接近数据信号的频带边缘的信号内容。 结果，定时错误检测可能效果较差，因此时钟恢复可能效率较低或失败。 公开了使用单个光载波来传输具有多个频带的数据信号的方法和系统，并且使用多个频带中的一个或多个内频带在接收机处执行定时误差检测。 因此，对于窄滤波的影响，定时误差检测可以更加稳健。

公开(公告)号：WO2018064815A1

公开(公告)日：2018-04-12

申请号：PCT/CN2016/101503

申请日：2016-10-08

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： ZAMANI, Mahdi ,  MITRA, Jeebak ,  NAJAFI, Hossein ,  ZHANG, Zhuhong ,  LI, Chuandong

IPC: H04B10/60

CPC classification number: H04B10/616 ,  H04B10/548 ,  H04B10/5561 ,  H04B10/613 ,  H04B10/614

Abstract: Aspects of the present disclosure are directed in part to a receiver DSP unit including an equalization module. The equalization module includes a trellis-based equalization module that may utilize multiple trellis-based processors (TBP), which can each be individually adaptively configured for performing a trellis-based equalization. The design of the TBPs allow them to be configured for compensating a residual Inter-Symbol Interference (ISI) as well as compensating a residual Phase Noise (PN). ISI is an example of an additive impairment and PN is an example of a multiplicative impairment that communication systems, particularly high speed transmission systems such as coherent optical systems, can suffer from.

Abstract translation: 本公开的各方面部分地针对包括均衡模块的接收机DSP单元。 均衡模块包括基于网格的均衡模块，其可以利用多个基于网格的处理器（TBP），其可以分别自适应地配置用于执行基于网格的均衡。 TBP的设计允许它们被配置为补偿残余符号间干扰（ISI）以及补偿残余相位噪声（PN）。 ISI是加性损伤的一个例子，PN是通信系统，特别是高速传输系统（如相干光学系统）可能遭受的倍增损伤的一个例子。

公开(公告)号：WO2017041626A1

公开(公告)日：2017-03-16

申请号：PCT/CN2016/096565

申请日：2016-08-24

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： MITRA, Jeebak ,  ZHANG, Zhuhong

IPC: G06F11/10

CPC classification number: H04L27/36 ,  H04L1/0047

Abstract: It is possible to compress log likelihood ratios (LLRs) by exploiting the mapping symmetry between bits in the same symbol. For example, two LLRs corresponding to the same dimension of a square Quadrature Amplitude Modulation (QAM) symbol can be compressed into a single compressed LLR that excludes the magnitude bits of one of the LLRs because the magnitude component of LLRs for bits corresponding to the same dimension of a square QAM symbol exhibit a piecewise linear relationship with one another. Similar techniques can be used to exploit piecewise linear relationships between a subset of constellation points in a non-square QAM constellation.

Abstract translation: 可以通过利用相同符号中的位之间的映射对称来压缩对数似然比（LLR）。 例如，对应于正方形正交幅度调制（QAM）符号的相同维度的两个LLR可以被压缩为排除一个LLR的幅度比特的单个压缩LLR，因为对应于同一个比特的比特的LLR的幅度分量 平方QAM符号的尺寸彼此呈现分段线性关系。 可以使用类似的技术来利用非正方形QAM星座中星座点的子集之间的分段线性关系。

公开(公告)号：WO2017059783A1

公开(公告)日：2017-04-13

申请号：PCT/CN2016/100836

申请日：2016-09-29

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： ZAMANI, Mahdi ,  NAJAFI, Hossein ,  YAO, Demin ,  MITRA, Jeebak ,  LI, Chuandong ,  ZHANG, Zhuhong

IPC: H04L27/00

CPC classification number: H04L25/03273 ,  H04L25/03203 ,  H04L27/0014 ,  H04L27/2275 ,  H04L27/3836 ,  H04L2027/0038

Abstract: A method and apparatus for performing residual phase noise compensation is described. A coarse carrier compensation of a received modulated signal is performed to obtain a coarse carrier compensated signal and a trellis-based residual carrier recovery is performed to estimate a residual phase noise of the coarse carrier compensated signal. The coarse carrier compensated signal is compensated based on the estimated residual phase noise.

Abstract translation: 描述了执行剩余相位噪声补偿的方法和装置。 执行接收的调制信号的粗略载波补偿以获得粗略的载波补偿信号，并且执行基于网格的残余载波恢复以估计粗略载波补偿信号的残余相位噪声。 基于估计的残余相位噪声来补偿粗略载波补偿信号。

公开(公告)号：WO2017059776A1

公开(公告)日：2017-04-13

申请号：PCT/CN2016/100421

申请日：2016-09-27

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： MITRA, Jeebak ,  ZHANG, Zhuhong

IPC: H04L25/03

CPC classification number: H04L25/03203 ,  H04L2025/0342

Abstract: Embodiment reduced-state trellis equalization techniques compute accumulated path metrics (APMs) for a subset of candidate states for at least some stages in the trellis based on a neighborhood map of an ML state. This reduces the number of APMs that are computed and stored during trellis equalization. Other embodiments select a subset of candidate states for which APMs are transported to the next stage of the trellis based on the neighborhood map. This eliminates the need to sort the remaining APMs during reduced state trellis equalization. The neighborhood map identifies a subset of the highest probability neighbors for an ML state. The subset of candidate states identified as highest probability neighbors may be saved in a look-up table. The look-up table may be generated offline and/or generated/updated dynamically during run-time operation.

Abstract translation: 实施方式的缩减状态网格均衡技术基于ML状态的邻域映射来计算网格中的至少一些阶段的候选状态子集的累积路径度量（APM）。 这减少了网格均衡期间计算和存储的APM的数量。 其他实施例基于邻域图选择APM被传输到网格的下一阶段的候选状态的子集。 这消除了在减少状态网格均衡期间对剩余的APM进行排序的需要。 邻域图识别ML状态的最高概率邻居的子集。 识别为最高概率邻居的候选状态的子集可以保存在查找表中。 可以在运行时操作期间离线查看和/或动态地生成/更新查找表。

公开(公告)号：WO2017005120A1

公开(公告)日：2017-01-12

申请号：PCT/CN2016/087484

申请日：2016-06-28

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： MITRA, Jeebak ,  ZHANG, Zhuhong

IPC: H04L25/03

CPC classification number: H04B10/6161 ,  H04B10/25133 ,  H04L25/03197 ,  H04L25/03203 ,  H04L25/03216 ,  H04L25/067

Abstract: Quasi-reduced state trellis equalization techniques achieve low-latency inter-symbol interference (ISI) equalization by selecting a subset of accumulated path metrics (APMs) for a leading symbol to propagate over a trellis to candidate states of a trailing symbol. This simplifies the computation of APMs for candidate states of the trailing symbol. Thereafter, APMs for candidate states of the trailing symbol are computed based on the subset of APMs for the leading symbol that were propagated over the trellis. Propagating fewer than all APMs for the leading symbol to the trailing symbol reduces the complexity of APM computation at the trailing symbol.

Abstract translation: 准减速状态网格均衡技术通过选择一个先行符号的累积路径度量（APM）的子集来实现低等待时间间符号间干扰（ISI）均衡，从而将网格传播到尾随符号的候选状态。 这简化了尾随符号的候选状态的APM的计算。 此后，基于在网格上传播的领先符号的APM的子集来计算用于候选状态的尾随符号的APM。 传播较少的前导符号的所有APM到尾随符号减少了尾随符号的APM计算的复杂性。

公开(公告)号：WO2023284617A1

公开(公告)日：2023-01-19

申请号：PCT/CN2022/104267

申请日：2022-07-07

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： MITRA, Jeebak ,  JANA, Mrinmoy ,  LAMPE, Lutz Hans-Joachim ,  WANG, Jin ,  LI, Chuandong

IPC: H04L27/06

Abstract: Methods and systems for low complexity interference cancellation in multichannel optical transmission are disclosed. Local or self-iteration is performed one or more times between an expected propagation decision feedback equalizer and a soft demapper. Following local iteration, a soft decision forward error correction decoder determines bit log-likelihood ratios, which are fed back to the expected propagation decision feedback equalizer and soft demapper for further self-iteration. Global iteration involving the decoder can also be performed one or more times before a bitstream is decoded.

公开(公告)号：WO2020233537A1

公开(公告)日：2020-11-26

申请号：PCT/CN2020/090730

申请日：2020-05-17

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： JANICEK, Rene ,  MITRA, Jeebak

IPC: H04B10/2543

Abstract: The disclosed structures and methods are directed to a method for compensation of linear and nonlinear effects in optical fiber of a coherent optical signal transmitted through an optical link. The method comprises receiving a coherent optical signal having carriers; determining values of intensity vectors for each carrier; determining values of filtered intensity vectors for each carrier by filtering the values of the intensity vectors at frequencies lower than a cut-off frequency of a filter; determining nonlinear compensation coefficients for each carrier based on the filtered intensity vectors; and modifying the digital coherent optical signal based on the nonlinear compensation coefficients.

公开(公告)号：WO2017045364A1

公开(公告)日：2017-03-23

申请号：PCT/CN2016/074345

申请日：2016-02-23

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： AHMED, Reaz ,  MITRA, Jeebak ,  CHOWDHURY, Shihabur ,  SHAHRIAR, Nashid ,  BOUTABA, Raouf

IPC: H04L12/46 ,  H04L12/24

CPC classification number: H04L41/12 ,  H04L12/4641

Abstract: Techniques for virtual network embedding (VNE) with dedicated protection of multiple virtual networks against a single node or link failure are described. The virtual network embedding provides dedicated protection without using redundant substrate network resources for each of the individual virtual networks (VNs) elements.

Abstract translation: 描述了具有针对单个节点或链路故障的多个虚拟网络专用保护的虚拟网络嵌入（VNE）技术。 虚拟网络嵌入提供专用保护，而不需要为每个单独的虚拟网络（VN）元件使用冗余的底层网络资源。

公开(公告)号：WO2022040775A1

公开(公告)日：2022-03-03

申请号：PCT/CA2020/051222

申请日：2020-09-10

Applicant: HUAWEI TECHNOLOGIES CO., LTD. ,  JANA, Mrinmoy ,  MITRA, Jeebak ,  LAMPE, Lutz Hans-Joachim ,  WANG, Jin ,  ZHANG, Zhuhong

Inventor： JANA, Mrinmoy ,  MITRA, Jeebak ,  LAMPE, Lutz Hans-Joachim ,  WANG, Jin ,  ZHANG, Zhuhong

IPC: H04B10/64 ,  H04J14/02 ,  H04L1/00

Abstract: A receiver architecture is described for phase noise compensation in the presence of inter-channel interference (ICI) and inter-symbol interference (ISI), particularly for time-frequency packing (TFP) transmissions. The receiver includes a coarse phase noise (PN) estimator, a PN compensation module, an ICI cancellation module, an ISI compensation module, a FEC decoder, and an iterative PN estimator. The iterative PN estimator receives log likelihood ratio (LLR) information from the decoder and provides an iterative PN estimation to the PN compensation module. The decoder also provides LLR to the ISI compensation module, and to at least one other receiver for another subchannel that is immediately adjacent in frequency. The ICI cancellation module receives decoder output from at least one adjacent subchannel, which the ICI cancellation module uses to provide a ICI-cancelled signal.