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34 条记录 (耗时 0.017 秒)

    MULTIDIMENSIONAL CODED-MODULATION FOR HIGH-SPEED OPTICAL TRANSPORT OVER FEW-MODE FIBERS
    1.
    发明申请
    MULTIDIMENSIONAL CODED-MODULATION FOR HIGH-SPEED OPTICAL TRANSPORT OVER FEW-MODE FIBERS 有权
    用于高速光纤传输的多模式编码调制

    公开(公告)号：US20140205283A1

    公开(公告)日：2014-07-24

    申请号：US13901766

    申请日：2013-05-24

    申请人： NEC Laboratories America, Inc.

    发明人： IVAN B. DJORDJEVIC ,  Lei Xu ,  Ting Wang

    IPC分类号： H04B10/2581

    CPC分类号： H04B10/2581 ,  H04B10/516 ,  H04L1/0041 ,  H04L5/0008 ,  H04L5/0023 ,  H04L27/3405 ,  H04L27/3422

    摘要： Systems and methods for data transport are provided which encode streams of data using low density parity check (LDPC) encoders and map data streams to symbols, by assigning bits of symbols to a signal constellation and associating bits with constellation points. Constellation points are generated using a D-dimensional optimum signal constellation design (OSCD) method. The OSCD determines an optimum source distribution for an optical channel, generates D-dimensional training sequences from the optimum source distribution, determines new signal constellation points as the center of mass for each D-dimensional cluster of points, and repeats these steps until convergence or until a predetermined number of iterations is reached. Coordinates obtained by the D-dimensional OSCD method are stored in a look-up-table (LUT), points are selected from the LUT using encoded data streams, coordinates are input into a D-dimensional modulator after digital-to-analog conversion (DAC), and a modulated signal is transmitted over an optical medium.

    摘要翻译： 提供了用于数据传输的系统和方法，其通过使用低密度奇偶校验（LDPC）编码器将数据流编码并将数据流映射到符号，通过将符号的位分配给信号星座并将比特与星座点相关联。 使用D维最佳信号星座设计（OSCD）方法生成星座点。 OSCD确定光通道的最佳光源分布，从最佳光源分布生成D维训练序列，将新的信号星座点确定为每个D维聚类点的质心，并重复这些步骤直到收敛或 直到达到预定次数的迭代。 通过D维OSCD方法获得的坐标被存储在查找表（LUT）中，使用编码数据流从LUT中选择点，在数模转换之后将坐标输入到D维调制器（ DAC），并且调制信号通过光学介质传输。

    Transmission system for transmitting a multilevel signal
    2.
    发明申请
    Transmission system for transmitting a multilevel signal 审中-公开
    用于发送多电平信号的传输系统

    公开(公告)号：US20020136318A1

    公开(公告)日：2002-09-26

    申请号：US10046633

    申请日：2002-01-14

    发明人： Alexei Gorokhov ,  Marten Erik Van Dijk ,  Arie Geert Cornelis Koppelaar

    IPC分类号： H04L005/12

    CPC分类号： H04L1/005 ,  H04L1/006 ,  H04L1/0071 ,  H04L27/3422

    摘要： Described is a transmission system for transmitting a multilevel signal (xk) from a transmitter (10) to a receiver (20). The transmitter (10) comprises a mapper (16) for mapping an input signal (ik) according to a signal constellation onto the multilevel signal (xk). The receiver (20) comprises a demapper (22) for demapping the received multilevel signal (yk) according to the signal constellation. The signal constellation comprises a number of signal points with corresponding labels. The signal constellation is constructed such that Da>Df, with Da being the minimum of the Euclidean distances between all pairs of signal points whose corresponding labels differ in a single position, and with Df being the minimum of the Euclidean distances between all pairs of signal points. By using this signal constellation a significantly lower error rate can be achieved than by using a prior-art signal constellation.

    摘要翻译： 描述了一种用于从发射机（10）向接收机（20）发送多电平信号（xk）的传输系统。 发射机（10）包括映射器（16），用于将根据信号星座的输入信号（ik）映射到多电平信号（xk）上。 接收器（20）包括用于根据信号星座解映射所接收的多电平信号（yk）的解映射器（22）。 信号星座包括具有相应标签的多个信号点。 信号星座被构造为使得Da> Df，其中Da是在相应标签在单个位置不同的所有信号点对之间的欧几里德距离的最小值，并且Df是所有信号对之间的欧几里德距离的最小值 积分 通过使用该信号星座，可以通过使用现有技术的信号星座来实现显着更低的误码率。

    Trellis shaping for modulation systems
    3.
    发明授权
    Trellis shaping for modulation systems 失效
    调制系统的网格整形

    公开(公告)号：US5150381A

    公开(公告)日：1992-09-22

    申请号：US421610

    申请日：1989-10-13

    申请人： G. David Forney, Jr. ,  Vedat M. Eyuboglu

    发明人： G. David Forney, Jr. ,  Vedat M. Eyuboglu

    IPC分类号： H04L27/34

    CPC分类号： H04L27/3411 ,  H04L27/3422 ,  H04L1/0042

    摘要： A digital data sequence is mapped into a signal point sequence for transmission, by selecting the signal point sequence from a subset of all possible signal point sequences based on the digital data sequence, all possible signal point sequences in the subset lying in a fundamental region of a trellis code, the fundamental region being other than a simple Cartesian product of finite-dimensional regions. In another aspect, a digital data sequence is mapped into a sequence of signal points for transmission, by specifying a class of possible sequences based on the digital data, and selecting the signal point sequence from the class, the selection being based on the respective average powers of the possible sequences of the class, the selection being based on not only a fixed-length block of the digital data.

    摘要翻译： 通过从基于数字数据序列的所有可能的信号点序列的子集中选择信号点序列，数字数据序列被映射到用于传输的信号点序列中，子集中的所有可能的信号点序列位于 网格码，基本区域不同于有限维区域的简单笛卡尔乘积。 在另一方面，通过基于数字数据指定一类可能的序列，并从该类中选择信号点序列，将数字数据序列映射到用于传输的信号点序列中，该选择基于相应的平均值 该类的可能序列的功率，该选择不仅基于数字数据的固定长度块。

    TRANSMISSION DEVICE
    6.
    发明申请
    TRANSMISSION DEVICE 有权
    传输设备

    公开(公告)号：US20100251061A1

    公开(公告)日：2010-09-30

    申请号：US12738621

    申请日：2008-10-30

    申请人： Shutai Okamura ,  Yutaka Murakami ,  Naoya Yosoku ,  Masayuki Orihashi

    发明人： Shutai Okamura ,  Yutaka Murakami ,  Naoya Yosoku ,  Masayuki Orihashi

    IPC分类号： H03M13/27 ,  G06F11/10

    CPC分类号： H03M13/1102 ,  H03M13/23 ,  H03M13/255 ,  H03M13/356 ,  H03M13/373 ,  H03M13/6362 ,  H04L1/005 ,  H04L1/0057 ,  H04L1/0059 ,  H04L1/0069 ,  H04L1/0071 ,  H04L1/06 ,  H04L5/0044 ,  H04L27/2626 ,  H04L27/3422

    摘要： Provided is a transmission device which improves the error rate characteristic upon decoding when performing error correction encoding by using a self-orthogonal code or an LDPC-CC in a communication system using a communication path having a fading fluctuation, multi-value modulation, or MIMO transmission. In the transmission device, the self-orthogonal encoding unit (110) encodes a self-orthogonal code having a constriction length K and an interleave unit (130) rearranges a code word sequence so that the same modulation symbol includes an information bit of a moment i and a non-correlated bit of the information bit of the moment i in a multi-value modulation unit (150).

    摘要翻译： 提供一种传输装置，其在使用具有衰落波动，多值调制或MIMO的通信路径的通信系统中通过使用自正交码或LDPC-CC进行纠错编码时，提高解码时的错误率特性 传输。 在发送装置中，自正交编码单元（110）编码具有收缩长度K的自正交码和交织单元（130）重新排列码字序列，使得相同的调制符号包括一个信息位 i和多值调制单元（150）中的时刻i的信息比特的非相关比特。

    Two-dimensional constellation generation, pruning, and partial gray coding for bandwidth and power efficiency
    7.
    发明授权
    Two-dimensional constellation generation, pruning, and partial gray coding for bandwidth and power efficiency 有权
    二维星座生成，修剪和部分灰度编码的带宽和功率效率

    公开(公告)号：US06567477B1

    公开(公告)日：2003-05-20

    申请号：US08959811

    申请日：2000-03-14

    申请人： David D. Feldman ,  Frank Chethik

    发明人： David D. Feldman ,  Frank Chethik

    IPC分类号： H04L2736

    CPC分类号： H04L27/3422

    摘要： An improved constellation pruning and partial Gray coding method for generating constellations that are transmitted by a transmitter. The approximate symbol error rate (SER) for each possible subconstellation is first determined. Then, each of the subconstellations are scaled in terms of power so that each subconstellation has the same symbol error rate. Then, the subconstellation that requires the least amount of power to generate is selected as the pruned constellation for use by the transmitter. After the pruned constellation is determined, it is then coded a single time, and this coded pruned constellation is used by the transmitter.

    摘要翻译： 改进的星座修剪和部分格雷编码方法，用于生成由发射机发射的星座。 首先确定每个可能的子星座的近似符号错误率（SER）。 然后，根据功率对每个子结构进行缩放，使得每个子星座具有相同的符号错误率。 然后，选择需要最少功率产生的子星座被选择为被发射机使用的修剪的星座。 在确定了修剪的星座之后，将其编码为一次，并且该编码的修剪星座由发射机使用。

    Probabilistic shaping QAM dynamic equalization and digital signal processing method
    9.
    发明授权
    Probabilistic shaping QAM dynamic equalization and digital signal processing method 有权

    公开(公告)号：US12063138B2

    公开(公告)日：2024-08-13

    申请号：US18196209

    申请日：2023-05-11

    申请人： SOOCHOW UNIVERSITY

    发明人： Mingyi Gao ,  Fengchu Cao ,  Pengfei Wang ,  Xiaodi You ,  Gangxiang Shen

    IPC分类号： H04L27/34 ,  H04L27/00 ,  H04L27/36

    CPC分类号： H04L27/363 ,  H04L27/3422 ,  H04L27/3494 ,  H04L2027/0036

    摘要： Probabilistic shaping quadrature amplitude modulation (QAM) based on Maxwell-Boltzmann distribution is particularly important in coherent optical communication, which can approach the Shannon limit more desirably in the case of a finite signal-to-noise ratio. However, standard coherent optical digital signal processing algorithms are not optimal for demodulation of PS higher-order QAM signals. The invention provides a probabilistic shaping QAM dynamic equalization method that intercepts multiple inner rings after clock recovery and updates the convergence radius and area of a conventional blind dynamic channel equalization algorithm using a peak density K-means clustering algorithm. The clustering algorithm gives centroid labels and a quantity of classifications required for K-means, which does not require a large number of iterations of K-means, thereby reducing the complexity and improving the accuracy. The updated decision area and decision radius reduce errors in the dynamic equalization algorithm, thereby improving the accuracy of probabilistic shaping QAM digital signal processing.