公开(公告)号：US20120216093A1

公开(公告)日：2012-08-23

申请号：US13402462

申请日：2012-02-22

申请人： Ivan B. Djordjevic ,  Shaoliang Zhang ,  Lei Xu ,  Fatih Yaman ,  Ting Wang

发明人： Ivan B. Djordjevic ,  Shaoliang Zhang ,  Lei Xu ,  Fatih Yaman ,  Ting Wang

IPC分类号： H03M13/29 ,  G06F11/10

CPC分类号： H03M13/1171 ,  H03M13/253 ,  H03M13/6561 ,  H04L1/0045 ,  H04L1/0055 ,  H04L1/0057 ,  H04L1/0071

摘要： Methods and systems for soft-decision non-binary low-density parity-check (LDPC) coding for ultra-long-haul optical transoceanic transmissions are provided. A receiver includes one or more maximum a posteriori (MAP) equalizers configured to decode one or more symbols of an encoded input stream to provide one or more symbol log-likelihood ratios (LLRs). One or more LLR estimators are configured to estimate the log-likelihood ratios of the one or more symbol LLRs to provide one or more bit LLRs. One or more non-binary LDPC decoders are configured to decode the input stream using the one or more bit LLRs to recover an original input stream.

摘要翻译： 提供了用于超长距离光学跨洋传输的软判决非二进制低密度奇偶校验（LDPC）编码的方法和系统。 接收机包括一个或多个最大后验（MAP）均衡器，其被配置为解码编码输入流的一个或多个符号以提供一个或多个符号对数似然比（LLR）。 一个或多个LLR估计器被配置为估计一个或多个符号LLR的对数似然比以提供一个或多个比特LLR。 一个或多个非二进制LDPC解码器被配置为使用一个或多个比特LLR解码输入流，以恢复原始输入流。

公开(公告)号：US20120207470A1

公开(公告)日：2012-08-16

申请号：US13270213

申请日：2011-10-10

申请人： Ivan B. Djordjevic ,  Lei Xu ,  Ting Wang

发明人： Ivan B. Djordjevic ,  Lei Xu ,  Ting Wang

IPC分类号： H04J14/04

CPC分类号： H04J14/0278 ,  H04B10/25 ,  H04B10/291 ,  H04J14/0201 ,  H04J14/04 ,  H04J14/06

摘要： An optical transport network based on multimode/multicore fibers includes a mode-multiplexer to multiplex independent data streams from one or more transmitters; a multimode erbium-doped fiber amplifier (MM EDFA) to compensate for MMF loss; a multimode optical add-drop multiplexer (MM OADM) to add and/or drop multimode channels in multimode networks; a multimode optical cross-connect; and a mode-demultiplexer to separate various mode streams to one or more receivers.

摘要翻译： 基于多模/多芯光纤的光传输网络包括：多路复用器，用于复用来自一个或多个发射机的独立数据流; 用于补偿MMF损耗的多模掺铒光纤放大器（MM EDFA）; 多模光分插复用器（MM OADM），用于在多模网络中添加和/或删除多模信道; 多模光交叉连接; 以及模式解复用器，用于将各种模式流分离到一个或多个接收器。

公开(公告)号：US08176381B2

公开(公告)日：2012-05-08

申请号：US12392374

申请日：2009-02-25

申请人： Ivan B. Djordjevic ,  Lei Xu ,  Ting Wang

发明人： Ivan B. Djordjevic ,  Lei Xu ,  Ting Wang

IPC分类号： H03M13/00

CPC分类号： H04L1/0066 ,  H03M13/296 ,  H04L1/005

摘要： A transmitter, a receiver, and corresponding methods are provided. The transmitter includes encoders configured to encode source bit streams from L information sources into bytes of codewords. Each encoder includes different (n, k) multidimensional turbo-product codes of code rate R=k/n, where k is a number of information bytes, and n is code word length. The encoders operate in at least two phases. A first phase involves operating ky column-encoders in parallel on kx bytes per column to generate the code words for a current dimension. A second phase involves operating nx row-encoders in parallel on ky memory locations per rows to generate the code words for the current dimension. The first and second phases are repeated for remaining layers of the current dimension and layers of other dimensions.

摘要翻译： 提供发射机，接收机和相应的方法。 发射机包括被配置为将来自L个信息源的源比特流编码成码字的字节的编码器。 每个编码器包括码率R = k / n的不同（n，k）多维turbo乘积码，其中k是信息字节数，n是码字长度。 编码器至少运行两个阶段。 第一阶段涉及每列以kx字节并行运行ky列编码器，以生成当前维度的代码字。 第二阶段涉及在每行每个ky个存储单元上并行运行nx行编码器，以生成当前维度的代码字。 对于当前尺寸和其他尺寸的层的剩余层重复第一和第二阶段。

公开(公告)号：US08175466B2

公开(公告)日：2012-05-08

申请号：US12535329

申请日：2009-08-04

申请人： Ivan B. Djordjevic ,  Lybomir L. Minkov ,  Lei Xu ,  Ting Wang

发明人： Ivan B. Djordjevic ,  Lybomir L. Minkov ,  Lei Xu ,  Ting Wang

IPC分类号： H04B10/06 ,  H04J14/06

CPC分类号： H04L1/005 ,  H04B10/60 ,  H04L1/0047 ,  H04L25/03203 ,  H04L25/03318 ,  H04L27/3488 ,  H04L2025/03375

摘要： Multilevel soft-equalizer detectors, such as a maximum a posteriori probability (MAP) detector, suitable for use in polarization multiplexed optical communications using multilevel modulations and coherent detection are disclosed. Detection systems and methods may consider two symbols transmitted over two orthogonal polarization states as a two-component symbol, which is effective in eliminating the bit error ratio (BER) floor phenomenon introduced by conventional soft equalizers.

摘要翻译： 公开了适用于使用多级调制和相干检测的偏振复用光通信中的多级软均衡器检测器，例如最大后验概率（MAP）检测器。 检测系统和方法可以将以两个正交极化状态发送的两个符号视为双分量符号，这有效消除了传统的软均衡器引入的误码率（BER）现象。

公开(公告)号：US20120084617A1

公开(公告)日：2012-04-05

申请号：US12896524

申请日：2010-10-01

申请人： Ivan B. Djordjevic ,  Lei Xu ,  Ting Wang

发明人： Ivan B. Djordjevic ,  Lei Xu ,  Ting Wang

IPC分类号： H03M13/11 ,  G06F11/10

CPC分类号： H04L1/0057 ,  H03M13/033 ,  H03M13/116 ,  H04L1/0051

摘要： Systems and methods enabling ultra-high-speed optical transport The systems and methods include receiving a modulated, encoded input stream. Channel impairments are removed using MAP equalization. Symbols are detected in the input stream to produce a stream of encoded data. The stream of encoded data is decoded with one or more low density parity check (LDPC) decoders that use an LDPC code built by modified progressive edge growth. The LDPC code is built by iteratively expanding trees from each variable node until all check nodes are connected to the respective variable node, while controlling both the local girth and the global girth of the code.

摘要翻译： 实现超高速光传输的系统和方法系统和方法包括接收调制编码的输入流。 使用MAP均衡消除信道损伤。 在输入流中检测符号以产生编码数据流。 用一个或多个低密度奇偶校验（LDPC）解码器对编码数据流进行解码，该解码器使用通过改进的渐进边缘增长构建的LDPC码。 通过从每个变量节点迭代扩展树，直到所有校验节点连接到相应的变量节点，同时控制代码的局部周长和全局周长来构建LDPC码。

公开(公告)号：US20120051452A1

公开(公告)日：2012-03-01

申请号：US12873915

申请日：2010-09-01

申请人： Ivan B. Djordjevic ,  Lei Xu ,  Ting Wang

发明人： Ivan B. Djordjevic ,  Lei Xu ,  Ting Wang

IPC分类号： H04L27/00 ,  H04L27/06

CPC分类号： H04L5/0028 ,  H04L1/0057 ,  H04L5/04 ,  H04L25/03171 ,  H04L25/067 ,  H04L27/2096 ,  H04L27/2627 ,  H04L27/2697 ,  H04L27/32 ,  H04L2025/03388 ,  H04L2025/03401 ,  H04L2025/03414

摘要： Methods and systems for optical communication using hybrid subcarrier/amplitude/phase/polarization modulation are shown that include LDPC encoding a plurality of groups of bitstreams. The groups of bitstreams are mapped to the points of a three-dimensional constellation that is represented by the vertices of a regular polyhedron and its dual. Each group of bitstreams is then modulated onto a respective subcarrier beam and the subcarrier beams are combined into a carrier beam using a power combiner.

摘要翻译： 示出了使用混合子载波/幅度/相位/偏振调制的光通信的方法和系统，其包括对多组比特流进行LDPC编码。 比特流组被映射到由正多面体的顶点及其双重表示的三维星座的点。 然后将每组比特流调制到相应的子载波波束上，并且使用功率组合器将子载波波束组合成载波波束。

公开(公告)号：US08006163B2

公开(公告)日：2011-08-23

申请号：US11950720

申请日：2007-12-05

申请人： Ivan B. Djordjevic ,  Milorad Cvjetic ,  Lei Xu ,  Ting Wang

发明人： Ivan B. Djordjevic ,  Milorad Cvjetic ,  Lei Xu ,  Ting Wang

IPC分类号： H03M13/00 ,  H04L27/06 ,  H04B10/00

CPC分类号： H03M13/2957 ,  H03M13/1102 ,  H03M13/116 ,  H03M13/3905 ,  H03M13/6331 ,  H04B10/2569 ,  H04B10/58 ,  H04B10/6971

摘要： A turbo equalizer includes a Bahl-Cocke-Jelinek-Raviv (BCJR) equalizer configured to receive a transmitted signal and partially cancel inter-symbol interference (ISI) due to polarization-mode dispersion (PMD). A low-density parity check (LDPC) decoder is coupled to the BCJR equalizer to receive channel bit reliabilities therefrom. The LDPC decoder iteratively provides extrinsic soft information feedback to the BCJR equalizer to compensate for PMD.

摘要翻译： 一个Turbo均衡器包括一个Bahl-Cocke-Jelinek-Raviv（BCJR）均衡器，配置成接收发射信号，并部分地消除由于偏振模色散（PMD）引起的符号间干扰（ISI）。 低密度奇偶校验（LDPC）解码器耦合到BCJR均衡器以从其接收信道位可靠性。 LDPC解码器向BCJR均衡器迭代地提供外部软信息反馈以补偿PMD。

公开(公告)号：US20110194855A1

公开(公告)日：2011-08-11

申请号：US12702895

申请日：2010-02-09

申请人： HUSSAM G. BATSHON ,  Lei Xu ,  Ting Wang ,  Ivan B. Djordjevic

发明人： HUSSAM G. BATSHON ,  Lei Xu ,  Ting Wang ,  Ivan B. Djordjevic

IPC分类号： H04J14/06

CPC分类号： H04J14/06 ,  H04B10/60 ,  H04B10/6161 ,  H04B10/6162

摘要： In a polarization-multiplexing optical communications system, a method and system for coherent reception of polarization-multiplexed optical communications. Training and data sequences are recovered from a plurality of orthogonally polarized signals, such that training and data sequences may be used on a single channel without loss of spectral efficiency. This is accomplished by estimating a channel response for each orthogonally polarized signal based on the mean of the signal and distinguishing between a data sequence and a training sequence in each orthogonally polarized signal. Such distinguishing is accomplished according to an iterative linear minimum mean-square equalization based on the respective channel response estimate.

摘要翻译： 在偏振复用光通信系统中，用于偏振复用光通信的相干接收的方法和系统。 从多个正交极化信号恢复训练和数据序列，使得训练和数据序列可以在单个信道上使用而不损失频谱效率。 这通过基于信号的平均值估计每个正交极化信号的信道响应并且在每个正交极化信号中区分数据序列和训练序列来实现。 这种区分是根据相应的信道响应估计的迭代线性最小均方均衡完成的。

公开(公告)号：US20110085624A1

公开(公告)日：2011-04-14

申请号：US12860659

申请日：2010-08-20

申请人： Ivan B. Djordjevic ,  Lei Xu ,  Ting Wang

发明人： Ivan B. Djordjevic ,  Lei Xu ,  Ting Wang

IPC分类号： H04L27/06

CPC分类号： H04L25/03171 ,  H04B10/532 ,  H04B10/6971 ,  H04J14/002 ,  H04J14/06 ,  H04L1/005 ,  H04L1/0057 ,  H04L1/0071 ,  H04L27/3405

摘要： Systems and methods for optical communication that use a transmitter/receiver. The systems and methods include receiving a modulated, encoded input stream. Channel memory is reduced using coarse digital backpropagation and other channel impairments are removed using turbo equalization. Symbols are detected in the input stream that conform to a non-uniform, polar constellation having a Gaussian source distribution to produce a stream of encoded data. The stream of encoded data is decoded with one or more low density parity check (LDPC) decoders.

摘要翻译： 使用发射机/接收机的光通信系统和方法。 系统和方法包括接收经调制的编码的输入流。 使用粗数字反向传播减少信道存储，并且使用turbo均衡消除其他信道损伤。 在符合具有高斯源分布的非均匀极坐标的输入流中检测符号以产生编码数据流。 编码数据流用一个或多个低密度奇偶校验（LDPC）解码器解码。

公开(公告)号：US20100050048A1

公开(公告)日：2010-02-25

申请号：US12392335

申请日：2009-02-25

申请人： Ivan B. Djordjevic ,  Lei Xu ,  Ting Wang

发明人： Ivan B. Djordjevic ,  Lei Xu ,  Ting Wang

IPC分类号： H03M13/29 ,  G06F11/10

CPC分类号： H03M13/1117 ,  H03M13/2957 ,  H03M13/6331 ,  H04L1/005 ,  H04L1/0057 ,  H04L1/0071 ,  H04L5/0008 ,  H04L25/03171 ,  H04L25/03203 ,  H04L25/067 ,  H04L27/223 ,  H04L27/2649 ,  H04L2025/03363 ,  H04L2025/03414 ,  H04L2025/03611

摘要： A receiver and method are provided for mitigation of finer non-linearities in multilevel coded-modulation schemes. The receiver includes a multilevel Bahl-Cocke-Jelinek-Raviv (BCJR) equalizer configured to receive channel samples of an input signal, partially mitigate fiber non-linearities, and provide symbol reliabilities. The receiver further includes a bit probabilities module coupled to the BCJR equalizer configured to calculate soft bit reliabilities from the symbol reliabilities. The receiver also includes one or more low-density parity-check (LDPC) decoders coupled to the bit probabilities module and the BCJR equalizer, configured to receive the soft bit reliabilities and output code words. The one or more LDPC decoders iteratively provide extrinsic soft information feedback to the BCJR equalizer to compensate for the fiber non-linearities.

摘要翻译： 提供了一种用于缓解多电平编码调制方案中更精细的非线性的接收机和方法。 接收机包括一个多层次Bahl-Cocke-Jelinek-Raviv（BCJR）均衡器，被配置为接收输入信号的信道样本，部分地减轻光纤非线性并提供符号可靠性。 接收机还包括耦合到BCJR均衡器的位概率模块，其被配置为从符号可靠性计算软比特可靠性。 接收机还包括耦合到比特概率模块和BCJR均衡器的一个或多个低密度奇偶校验（LDPC）解码器，被配置为接收软比特可靠性和输出码字。 一个或多个LDPC解码器向BCJR均衡器迭代地提供外部软信息反馈以补偿光纤非线性。