公开(公告)号：US20130108270A1

公开(公告)日：2013-05-02

申请号：US13667708

申请日：2012-11-02

Applicant: NEC Laboratories America, Inc.

Inventor： Shaoliang ZHANG ,  Dayou QIAN ,  Junqiang HU ,  Lei XU ,  Ting WANG

IPC: H04J14/06

CPC classification number: H04J14/06 ,  H04B10/5055

Abstract: Disclosed are universal QPSK transmitter structures and methods for generating different QPSK signals exhibiting different polarization schemes, namely PolMux, PolMod and PolSw. The bit rate of the generated signals is variable, thereby allowing the transmitter to adjust to varying network traffic conditions. Advantageously, the generated signals may be detected by analog receivers (PolSw-QPSK) and coherent receivers (PolMux-QPSK, PolMod-QPSK, and PolSw-QPSK).

Abstract translation: 公开了用于产生表现出不同偏振方案的不同QPSK信号的通用QPSK发射机结构和方法，即PolMux，PolMod和PolSw。 所产生的信号的比特率是可变的，从而允许发射机适应不同的网络业务状况。 有利地，所产生的信号可以由模拟接收机（PolSw-QPSK）和相干接收机（PolMux-QPSK，PolMod-QPSK和PolSw-QPSK）来检测。

公开(公告)号：US20130091398A1

公开(公告)日：2013-04-11

申请号：US13646454

申请日：2012-10-05

Applicant: NEC Laboratories America, Inc.

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

IPC: H03M13/05

CPC classification number: H04L1/0057 ,  H03M13/116 ,  H03M13/255 ,  H03M13/2957 ,  H03M13/3905 ,  H03M13/3972 ,  H03M13/6331 ,  H04J14/06 ,  H04L1/0003

Abstract: Systems and methods for data transport, comprising encoding one or more streams of input data with one or more low density parity check (LDPC) encoders, corresponding to one or more polarization/spatial mode branches. One or more encoded data streams are mapped to symbols, wherein the mapper is configured to assign bits of the symbols to a signal constellation and to associate the bits of the symbols with signal constellation points. A signal constellation is formulated which minimizes a mean-square error of the signal constellation representing the source. The optimum signal constellation size is adjusted to improve transmission quality by adjusting the signal constellation an optical signal to noise ratio (OSNR), wherein the signal constellation is selected using a look-up table (LUT); and the symbols are modulated in accordance with the output of the mapper onto a transmission medium.

Abstract translation: 用于数据传输的系统和方法，包括对应于一个或多个极化/空间模式分支，用一个或多个低密度奇偶校验（LDPC）编码器编码一个或多个输入数据流。 将一个或多个编码数据流映射到符号，其中映射器被配置为将符号的位分配给信号星座并将符号的位与信号星座点相关联。 配置信号星座，其最小化表示源的信号星座的均方误差。 调整最佳信号星座大小以通过调整信号星座图的光信噪比（OSNR）来提高传输质​​量，其中使用查找表（LUT）来选择信号星座; 并且根据映射器的输出将符号调制到传输介质上。

公开(公告)号：US20130091399A1

公开(公告)日：2013-04-11

申请号：US13646470

申请日：2012-10-05

Applicant: NEC LABORATORIES AMERICA, INC.

Inventor： Junqiang HU ,  Lei XU ,  Ting WANG

IPC: H03M13/13

CPC classification number: H03M13/13 ,  H03M13/1117 ,  H03M13/1137 ,  H03M13/1145 ,  H03M13/116

Abstract: A Quasi-Cyclic, LDPC, large girth, soft-decision decoder and accompanying methods.

Abstract translation: 准循环，LDPC，大环，软判决解码器及其附带的方法。