利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

80 条记录 (耗时 0.024 秒)

    Data transport using pairwise optimized multi-dimensional constellation with clustering
    2.
    发明授权
    Data transport using pairwise optimized multi-dimensional constellation with clustering 有权

    公开(公告)号：US10236989B2

    公开(公告)日：2019-03-19

    申请号：US15729021

    申请日：2017-10-10

    申请人： NEC Laboratories America, Inc. ,  NEC Corporation

    发明人： Shaoliang Zhang ,  Fatih Yaman ,  Eduardo Mateo Rodriguez ,  Yoshihisa Inada

    IPC分类号： H04B10/54 ,  H04Q11/00 ,  H04B10/079 ,  H04B10/516 ,  H04B10/532

    摘要： Systems and methods for data transport in an optical communications system, including generating a pairwise optimized (PO) multi-dimensional signal constellation in a single stage. The PO multi-dimensional signal constellation is generated by selecting a pair of symbols from a received constellation with M symbols, defining and minimizing an objective function with one or more constraints to optimize the selected pair of symbols, and iteratively selecting and optimizing one or more different pairs of symbols from the received constellation until a threshold condition is reached. Neighbor symbols from the generated PO multi-dimensional signal constellation in each polarization are clustered to formulate a clustered PO multi-dimensional signal constellation, and data is modulated and transmitted in accordance with the clustered PO multi-dimensional signal constellation.

    Polarization Switching for Optical Fiber Communications
    6.
    发明申请
    Polarization Switching for Optical Fiber Communications 有权
    光纤通信的极化切换

    公开(公告)号：US20130089327A1

    公开(公告)日：2013-04-11

    申请号：US13649161

    申请日：2012-10-11

    申请人： NEC Laboratories America, Inc. ,  NEC Corporation

    发明人： Shaoliang Zhang ,  Lei Xu ,  Junqiang Hu ,  Fatih Yaman ,  Ting Wang ,  Yoshihisa Inada ,  Takaaki Ogata ,  Yasuhiro Aoki

    IPC分类号： H04J14/06 ,  H04J14/08

    CPC分类号： H04B10/5055 ,  H04B10/5561 ,  H04J14/06

    摘要： A method implemented in a transmission apparatus used in an optical fiber communications system for a polarization switched differential quaternary phase-shift keying (DQPSK) signal is disclosed. The method comprises splitting data into two or more data streams, inputting said two or more data streams to 1-bit DQPSK precoders to perform 1-bit DQPSK precoding, and multiplexing inphase outputs of the 1-bit DQPSK precoders to generate a first output; and multiplexing quadrature outputs of the 1-bit DQPSK precoders to generate a second output. Other methods, apparatuses, and systems also are disclosed.

    摘要翻译： 公开了一种在用于偏振切换差分四相移键控（DQPSK）信号的光纤通信系统中使用的发送装置中实现的方法。 该方法包括将数据分成两个或更多个数据流，将所述两个或多个数据流输入到1比特DQPSK预编码器以执行1比特DQPSK预编码，以及复用1比特DQPSK预编码器的同相输出以产生第一输出; 以及复用1位DQPSK预编码器的正交输出以产生第二输出。 还公开了其它方法，装置和系统。

    Low density parity check coded modulation for optical communications
    7.
    发明授权
    Low density parity check coded modulation for optical communications 有权

    公开(公告)号：US10374632B2

    公开(公告)日：2019-08-06

    申请号：US15729110

    申请日：2017-10-10

    申请人： NEC Laboratories America, Inc. ,  NEC Corporation

    发明人： Shaoliang Zhang ,  Fatih Yaman ,  Ting Wang ,  Yoshihisa Inada

    IPC分类号： H03M13/11 ,  H03M13/29 ,  H03M13/00 ,  H04L1/00 ,  H04B10/27 ,  H04B10/516 ,  H04B10/61 ,  H03M13/27

    摘要： Systems and methods for data transport in optical communications systems, including a transmitter for encoding a received information sequence by constructing an outer and inner quasi cyclic-low-density parity check (QC-LDPC) code. The encoding includes dividing the received information sequence into a plurality of messages of equal length, encoding each of the messages into a codeword to generate a plurality of outer codewords, cascading the plurality of outer codewords to generate a bit sequence, and executing inner encoding to encode each of the plurality of outer codewords into codewords in QC-LDPC inner code. A receiver decodes a received data stream based on the QC-LDPC inner code using two-phase decoding including iteratively performing at least one of inner/outer and outer/inner decoding until a threshold condition is reached.