公开(公告)号：US08538278B2

公开(公告)日：2013-09-17

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： H04B10/06

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：US08385439B2

公开(公告)日：2013-02-26

申请号：US12392294

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： H04K1/10 ,  H04K3/00 ,  H04B10/06

CPC分类号： H04L27/3405 ,  H04B10/2569 ,  H04B10/60 ,  H04B10/697 ,  H04B2210/252 ,  H04L1/005 ,  H04L1/0631 ,  H04L1/0656 ,  H04L5/0023 ,  H04L25/067 ,  H04L27/2649 ,  H04L2025/03426 ,  H04L2025/03611

摘要： Receivers and methods are provided for polarization mode dispersion compensation in multi-level coded-modulation schemes using a BLAST algorithm and iterative polarization cancellation. A receiver includes a vertical Bell Laboratories Layered Space-Time Architecture (V-BLAST) orthogonal frequency division multiplexing (OFDM) detector configured to receive input sequences and partially cancel polarization interference with respect to the input sequences to output symbol estimates for the input sequences. The receiver further includes one or more low-density parity-check (LDPC) decoders coupled to the V-BLAST OFDM detector configured to receive channel bit reliabilities and output code words. The channel bit reliabilities are indirectly calculated from the symbol estimates. The one or more LDPC decoders iteratively provide extrinsic soft information feedback to the V-BLAST OFDM detector to compensate for the polarization interference.

摘要翻译： 为使用BLAST算法和迭代偏振消除的多电平编码调制方案中的偏振模色散补偿提供接收机和方法。 接收机包括垂直的贝尔实验室分层时空架构（V-BLAST）正交频分复用（OFDM）检测器，其被配置为接收输入序列并部分地消除相对于输入序列的偏振干扰，以输出输入序列的符号估计。 接收机还包括耦合到V-BLAST OFDM检测器的一个或多个低密度奇偶校验（LDPC）解码器，被配置为接收信道位可靠性和输出码字。 信道位可靠性是从符号估计中间接计算的。 一个或多个LDPC解码器向V-BLAST OFDM检测器反复地提供外在的软信息反馈以补偿极化干扰。

公开(公告)号：US07992070B2

公开(公告)日：2011-08-02

申请号：US11950757

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

CPC分类号： H03M13/255 ,  H03M13/11 ,  H04L25/03171 ,  H04L25/067 ,  H04L27/183 ,  H04L27/186 ,  H04L2025/03611

摘要： A transmitter includes a plurality of encoders configured to receive source bit streams from m information sources, each of the plurality encoders including identical (n,k) low-density parity check (LDPC) codes of code rate r=k/n, where k is a number of information bits and n is codeword length. An interleaver is configured to collect m row-wise codewords from the plurality of encoders, and a mapper is configured to receive m bits at a time column-wise from the interleaver and to determine an M-ary signal constellation point. A modulator is configured to modulate a light source in accordance with the output of the mapper at a transmission rate Rs/r (Rs—the symbol rate, r—-the code rate). A receiver and transmission and receiving methods are also disclosed.

摘要翻译： 发射机包括被配置为从m个信息源接收源比特流的多个编码器，多个编码器中的每一个包括码率为r = k / n的相同（n，k）个低密度奇偶校验码（LDPC）码，其中k 是多个信息位，n是码字长度。 交织器被配置为从多个编码器收集m个逐行码字，并且映射器被配置为从交织器逐列地接收m个比特，并且确定M元信号星座点。 调制器被配置为根据映射器的输出以传输速率Rs / r（Rs-符号率，r-码率）调制光源。 还公开了接收机和发送和接收方法。

公开(公告)号：US20100232804A1

公开(公告)日：2010-09-16

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： H04B10/00 ,  H03K5/159 ,  H04B10/04 ,  H04B10/06

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，这有效消除了常规软均衡器引入的误码率（BER）的现象。

公开(公告)号：US20090177945A1

公开(公告)日：2009-07-09

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

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：US20080163025A1

公开(公告)日：2008-07-03

申请号：US11950757

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： H03M13/05 ,  G06F11/10

CPC分类号： H03M13/255 ,  H03M13/11 ,  H04L25/03171 ,  H04L25/067 ,  H04L27/183 ,  H04L27/186 ,  H04L2025/03611

摘要： A transmitter includes a plurality of encoders configured to receive source bit streams from m information sources, each of the plurality encoders including identical (n,k) low-density parity check (LDPC) codes of code rate r=k/n, where k is a number of information bits and n is codeword length. An interleaver is configured to collect m row-wise codewords from the plurality of encoders, and a mapper is configured to receive m bits at a time column-wise from the interleaver and to determine an M-ary signal constellation point. A modulator is configured to modulate a light source in accordance with the output of the mapper at a transmission rate Rs/r (Rs—the symbol rate, r—the code rate). A receiver and transmission and receiving methods are also disclosed.

摘要翻译： 发射机包括被配置为从m个信息源接收源比特流的多个编码器，多个编码器中的每一个包括码率为r = k / n的相同（n，k）个低密度奇偶校验码（LDPC）码，其中k 是多个信息位，n是码字长度。 交织器被配置为从多个编码器收集m个逐行码字，并且映射器被配置为从交织器逐列地接收m个比特，并且确定M元信号星座点。 调制器被配置为根据映射器的输出以传输速率R / R（R s） - 符号率r-调制光源 码率）。 还公开了接收机和发送和接收方法。

公开(公告)号：US08768175B2

公开(公告)日：2014-07-01

申请号：US13251214

申请日：2011-10-01

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

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

IPC分类号： H04L27/26 ,  H04B10/548 ,  H04J14/06

CPC分类号： H04B10/548 ,  H04J14/06 ,  H04L27/2628 ,  H04L27/265 ,  H04L27/2697

摘要： Systems and methods are disclosed to perform four-dimensional optical multiband OFDM communication by organizing an N-dimensional (ND) signal constellation points as a signal matrix; performing 2D-inverse FFT and 2D-FFT to perform modulation and demodulation, respectively; and applying both orthogonal polarizations in the OFDM communication to deal with chromatic dispersion, PMD and PDL effects, and multidimensional signal constellation to improve optical signal-to-noise ratio (OSNR) sensitivity.

摘要翻译： 公开了通过组织N维（ND）信号星座点作为信号矩阵来执行四维光多频带OFDM通信的系统和方法; 分别执行2D反FFT和2D-FFT以进行调制和解调; 并且在OFDM通信中应用正交偏振以处理色散，PMD和PDL效应以及多维信号星座以提高光信噪比（OSNR）灵敏度。

公开(公告)号：US08660205B2

公开(公告)日：2014-02-25

申请号：US13487246

申请日：2012-06-03

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

CPC分类号： H04L27/3411

摘要： A method and apparatus employing statistical physics energy minimization methods to signal constellation design. By using statistical physics concepts, an energy-efficient signal constellation design algorithm (EE-SCDA) is described. In the presence of amplified spontaneous emission (ASE) noise and channel impairments, we use EE-SCDA to determine a source distribution, and represent the signal constellation design as a center of mass problem. Furthermore a discrete-time implementation of D-dimensional transceiver as well as corresponding EE polarization-division multiplexed (PDM) system is described.

摘要翻译： 采用统计物理能量最小化方法来信号星座设计的方法和装置。 通过使用统计物理概念，描述了一种节能信号星座设计算法（EE-SCDA）。 在放大的自发发射（ASE）噪声和信道损伤的存在下，我们使用EE-SCDA来确定源分布，并将信号星座设计表示为质心问题。 此外，描述了D维收发器的离散时间实现以及相应的EE偏振分复用（PDM）系统。

公开(公告)号：US08381065B2

公开(公告)日：2013-02-19

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： H03M13/00

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：US20120260142A1

公开(公告)日：2012-10-11

申请号：US13441808

申请日：2012-04-06

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

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

IPC分类号： H03M13/05 ,  G06F11/10

CPC分类号： H04L1/0058 ,  H03M13/1171 ,  H03M13/255 ,  H04B10/5055 ,  H04L1/0047 ,  H04L27/2096

摘要： Systems and methods are disclosed for communicating signals, by receiving a K-symbol-long input block from a 2m-ary source channel; encoding the input block into a 2m-ary non-binary low-density parity-check (LDPC) codeword of length N; and mapping each 2m-ary symbol to a point in a signal constellation comprised of 2m points, wherein a non-binary LDPC code is used as the component code for forward error correction in a coded modulation scheme capable of achieving optical fiber communication at rates beyond 100 Gb/s.

摘要翻译： 公开了通过从2m源信道接收K符号长的输入块来传送信号的系统和方法; 将输入块编码为长度为N的2m元非二进制低密度奇偶校验（LDPC）码字; 并将每个2m元符号映射到由2m点组成的信号星座中的一个点，其中使用非二进制LDPC码作为能够以超出速率实现光纤通信的编码调制方案中的前向纠错的分量码 100 Gb / s。