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    Reverse concatenated encoding and decoding
    1.
    发明授权
    Reverse concatenated encoding and decoding 有权
    反向级联编码和解码

    公开(公告)号：US08595585B2

    公开(公告)日：2013-11-26

    申请号：US13116249

    申请日：2011-05-26

    Applicant: Ivan B. Djordjevic ,  Lei Xu ,  Ting Wang

    Inventor： Ivan B. Djordjevic ,  Lei Xu ,  Ting Wang

    IPC: H03M13/00 ,  G06F11/00

    CPC classification number: H03M13/2963 ,  H03M13/1102 ,  H03M13/1117 ,  H03M13/136 ,  H03M13/152 ,  H03M13/6331 ,  H04L1/005 ,  H04L1/0057

    Abstract: Methods and systems for transmitting and receiving data include reverse concatenated encoding and decoding. Reverse concatenated decoding includes inner decoding the encoded stream with an inner decoder that uses a low-complexity linear-block code to produce an inner-decoder output stream, outer decoding the inner-decoder output stream with an outer decoder that uses a low-density parity-check code to produce an information stream, and iterating extrinsic bit reliabilities from the outer decoding for use in subsequent inner decoding to improve decoding performance.

    Abstract translation: 发送和接收数据的方法和系统包括反向级联编码和解码。 反向级联解码包括使用内部解码器对编码流进行内部解码，内部解码器使用低复杂度线性块码来产生内部解码器输出流，使用外部解码器对内部解码器输出流进行外部解码，外部解码器使用低密度 奇偶校验码产生信息流，以及从外部解码中迭代外部位可靠性，用于随后的内部解码以提高解码性能。

    Reduced-complexity LDPC decoding
    2.
    发明授权
    Reduced-complexity LDPC decoding 有权
    降低复杂度的LDPC解码

    公开(公告)号：US08589755B2

    公开(公告)日：2013-11-19

    申请号：US13114793

    申请日：2011-05-24

    Applicant: Ivan B. Djordjevic ,  Lei Xu ,  Ting Wang

    Inventor： Ivan B. Djordjevic ,  Lei Xu ,  Ting Wang

    IPC: H03M13/00 ,  G06F11/00

    CPC classification number: H03M13/1117 ,  H03M13/6502 ,  H03M13/658 ,  H04L1/0047 ,  H04L1/0054 ,  H04L1/0057 ,  H04L1/0071

    Abstract: Methods and systems for reduced-complexity decoding of low-density parity-check (LDPC) information. An encoded input stream is received. The received stream is decoded with one or more reduced-complexity min-sum or a posteriori probability LDPC decoders. A v-node update rule in the reduced complexity decoder is omitted.

    Abstract translation: 用于低密度奇偶校验（LDPC）信息的降低复杂度解码的方法和系统。 接收编码的输入流。 所接收的流被解码为一个或多个复杂度较低的最小和或后验概率LDPC解码器。 省略了复杂度降低的解码器中的v节点更新规则。

    GLDPC encoding with Reed-Muller component codes for optical communications
    3.
    发明授权
    GLDPC encoding with Reed-Muller component codes for optical communications 有权
    用于光通信的Reed-Muller组件代码的GLDPC编码

    公开(公告)号：US08386879B2

    公开(公告)日：2013-02-26

    申请号：US12189759

    申请日：2008-08-11

    Applicant: Ivan B Djordjevic ,  Lei Xu ,  Ting Wang ,  Milorad Cvijetic

    Inventor： Ivan B Djordjevic ,  Lei Xu ,  Ting Wang ,  Milorad Cvijetic

    IPC: G06F11/00

    CPC classification number: H03M13/1174 ,  H03M13/136

    Abstract: A method of encoding for optical transmission of information includes encoding information with a generalized low-density parity-check (GLDPC) code for providing coding gains, and constructing the GLDPC code with a Reed-Muller RM code as a component code, the component code being decodable using a maximum posterior probability (MAP) decoding. In a preferred embodiment, the GLDPC code includes a codeword length of substantially 4096, an information word length of substantially 3201, a lower-bound on minimum distance of substantially greater than or equal to 16, a code rate of substantially 0.78 and the RM component code includes an order of substantially 4 and an r parameter of substantially 6.

    Abstract translation: 用于信息的光传输的编码方法包括使用用于提供编码增益的广义低密度奇偶校验（GLDPC）码的编码信息，以及用作为分量代码的里德 - 穆勒RM码构建GLDPC码， 使用最大后验概率（MAP）解码来解码。 在优选实施例中，GLDPC代码包括基本上为4096的码字长度，基本为3201的信息字长度，基本上大于或等于16的最小距离的下限，码率基本上为0.78，并且RM分量 代码包括基本为4的顺序和基本为6的r参数。

    System, Devices and Methods for Subcarrier Recovery at Local Oscillator Frequency in Optical OFDM System
    5.
    发明申请
    System, Devices and Methods for Subcarrier Recovery at Local Oscillator Frequency in Optical OFDM System 审中-公开
    系统，器件和方法在光OFDM系统中本地振荡器频率下的副载波恢复

    公开(公告)号：US20120141138A1

    公开(公告)日：2012-06-07

    申请号：US12959874

    申请日：2010-12-03

    Applicant: Qi YANG ,  Zhixue HE ,  Wu LIU ,  William SHIEH ,  Ivan B. DJORDJEVIC ,  Zhu YANG ,  Shaohua YU

    Inventor： Qi YANG ,  Zhixue HE ,  Wu LIU ,  William SHIEH ,  Ivan B. DJORDJEVIC ,  Zhu YANG ,  Shaohua YU

    IPC: H04B10/02 ,  H04B10/00

    CPC classification number: H04L27/2096 ,  H04B10/548 ,  H04B10/611 ,  H04L1/0003 ,  H04L1/0057 ,  H04L27/223 ,  H04L27/2634 ,  H04L27/2697

    Abstract: The invention provides methods, devices and a system for recovering the corrupted subcarrier at the local oscillator (LO) frequency in coherent optical OFDM transmission. The method includes performing advanced coding on a data signal to obtain an encoded signal; performing high order modulation on the encoded signal to obtain a high-order-modulated signal; performing OFDM modulation on the high-order-modulated signal to obtain an electrical OFDM signal; and performing up-conversion on the electrical OFDM signal to obtain an optical OFDM signal to be output. The inventive technique of employing advanced coding with low rate combining with higher order modulation can be used to reduce the decoding bit error ratio (bit error rate) level, so that the LO subcarrier can be fully recovered while the bandwidth of the transmitted signal may be substantially the same as the existing optical OFDM system, and there is no need to add any feedback control module or feedback loop support or the like to the existing optical OFDM system, so that the complexity of the receiving side can be reduced.

    Abstract translation: 本发明提供用于在相干光OFDM传输中恢复本地振荡器（LO）频率处的损坏子载波的方法，装置和系统。 该方法包括对数据信号执行高级编码以获得编码信号; 对编码信号执行高阶调制以获得高阶调制信号; 对高阶调制信号进行OFDM调制以获得电子OFDM信号; 并对电子OFDM信号执行上变频以获得要输出的光OFDM信号。 可以使用以较低速率组合高阶调制的高级编码的本发明技术来减少解码误码率（误码率）电平，使得LO子载波可以完全恢复，而发射信号的带宽可以是 与现有的光学OFDM系统基本相同，并且不需要向现有的光学OFDM系统添加任何反馈控制模块或反馈环路支持等，从而可以减少接收侧的复杂性。

    WAVELENGTH TRANSMISSION SYSTEM AND METHOD USING 3-DIMENSIONAL LDPC-CODED MODULATION
    6.
    发明申请
    WAVELENGTH TRANSMISSION SYSTEM AND METHOD USING 3-DIMENSIONAL LDPC-CODED MODULATION 有权
    波长传输系统和使用三维LDPC编码调制的方法

    公开(公告)号：US20090052907A1

    公开(公告)日：2009-02-26

    申请号：US12050507

    申请日：2008-03-18

    Applicant: HUSSAM G. BATSHON ,  IVAN B. DJORDJEVIC ,  LEI XU ,  TING WANG ,  MILORAD CVIJETIC

    Inventor： HUSSAM G. BATSHON ,  IVAN B. DJORDJEVIC ,  LEI XU ,  TING WANG ,  MILORAD CVIJETIC

    IPC: H04B10/04 ,  H04B10/06 ,  G06F11/00

    CPC classification number: H04L27/3416 ,  H04L1/005 ,  H04L1/0057 ,  H04L1/0071 ,  H04L25/03178 ,  H04L25/067 ,  H04L2025/03611

    Abstract: A transmitter and method include a LDPC encoder configured to encode source data, and a mapper configured to generate three coordinates in accordance with a 3D signal constellation where the coordinates include an amplitude coordinate and two phase coordinates. A laser source is modulated in accordance with each of the three coordinates to provide a transmission signal. A receiver, includes a demapper receives an input signal from three branches to demap the input signal using a three-dimensional signal constellation having three coordinates. The three branches include a direct detection branch, and two coherent detection branches such that the direct detection branch detects an amplitude coordinate of the input signal and the two coherent detection branches detect in-phase and quadrature coordinates of the input signal. A bit prediction module and at least one LDPC decoder are configured to iteratively decode bits by feeding back extrinsic LLRs to the demapper.

    Abstract translation: 发射机和方法包括被配置为对源数据进行编码的LDPC编码器，以及映射器，被配置为根据其中坐标包括振幅坐标和两个相位坐标的3D信号星座生成三个坐标。 根据三个坐标中的每一个调制激光源，以提供发送信号。 接收机包括解映射器，接收来自三个分支的输入信号，以使用具有三个坐标的三维信号星座对输入信号进行解映射。 三个分支包括直接检测分支和两个相干检测分支，使得直接检测分支检测输入信号的幅度坐标，并且两个相干检测分支检测输入信号的同相和正交坐标。 比特预测模块和至少一个LDPC解码器被配置为通过将外部LLR反馈到解映射器来迭代地解码比特。

    Generalized OFDM (GOFDM) for ultra-high-speed serial optical transport networks
    9.
    发明授权
    Generalized OFDM (GOFDM) for ultra-high-speed serial optical transport networks 有权
    用于超高速串行光传输网络的广义OFDM（GOFDM）

    公开(公告)号：US08699625B2

    公开(公告)日：2014-04-15

    申请号：US13270211

    申请日：2011-10-10

    Applicant: Ivan B. Djordjevic ,  Lei Xu ,  Ting Wang

    Inventor： Ivan B. Djordjevic ,  Lei Xu ,  Ting Wang

    IPC: H03K9/00 ,  H04Q11/02 ,  H04B3/20

    CPC classification number: H04L1/0057 ,  H04L1/0042 ,  H04L5/0016 ,  H04L5/04 ,  H04L25/067 ,  H04L27/2628 ,  H04L27/3427

    Abstract: A coded multidimensional modulation system called generalized OFDM (GOFDM) uses orthogonal subcarriers as bases functions, and the signal constellation points of corresponding multidimensional constellation diagram are obtained as N-dimensional Cartesian product of one-dimensional PAM/two-dimensional QAM. In GOFDM, the N-dimensional/2N-dimensional signal constellation point is transmitted over all N subcarriers/2N-subcarriers, which serve as individual bases functions. Even if some of the subcarriers are severely affected by channel distortion, the overall signal constellation point will face only small distortion, when strong channel capacity achieving channel codes are used. In addition, because the channel capacity is a linear function of number of dimensions, the spectral efficiency of optical transmission systems is significantly improved. Finally, since Euclidean distance of multidimensional signal constellation is much larger that that of two-dimensional signal constellations, OSNR sensitivity is dramatically improved.

    Abstract translation: 称为广义OFDM（GOFDM）的编码多维调制系统使用正交子载波作为基本功能，并且获得相应多维星座图的信号星座点作为一维PAM /二维QAM的N维笛卡尔乘积。 在GOFDM中，N维/ 2N维信号星座点在用作各个基本功能的所有N个子载波/ 2N个子载波上发送。 即使某些子载波受到信道失真的严重影响，当使用实现信道码的强信道容量时，整个信号星座点也只会面临小的失真。 另外，由于信道容量是维数的线性函数，所以光传输系统的频谱效率显着提高。 最后，由于多维信号星座的欧几里德距离远大于二维信号星座的距离，因此OSNR灵敏度得到显着提高。

    ENERGY EFFICIENT CONSTELLATION METHOD AND SYSTEM
    10.
    发明申请
    ENERGY EFFICIENT CONSTELLATION METHOD AND SYSTEM 有权
    能源有效的方法和系统

    公开(公告)号：US20120307933A1

    公开(公告)日：2012-12-06

    申请号：US13487246

    申请日：2012-06-03

    Applicant: Ivan B. DJORDJEVIC ,  Lei XU ,  Ting WANG

    Inventor： Ivan B. DJORDJEVIC ,  Lei XU ,  Ting WANG

    IPC: H04L27/00

    CPC classification number: H04L27/3411

    Abstract: 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.

    Abstract translation: 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。

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