公开(公告)号：US09036723B2

公开(公告)日：2015-05-19

申请号：US14032449

申请日：2013-09-20

Applicant: NEC Laboratories America, Inc.

Inventor： Shaoliang Zhang ,  Ting Wang

IPC: H04L7/04 ,  H04L27/26

CPC classification number: H04L7/042 ,  H04L27/2601 ,  H04L27/2613 ,  H04L27/2657 ,  H04L27/2663 ,  H04L27/2671 ,  H04L27/2672 ,  H04L27/2675

Abstract: A training symbol with two identical halves as well as a pilot-tone at a center frequency is used for both timing synchronization and carrier frequency offset estimation. A timing synchronization is achieved by finding a peak of a cross-correlation function of the two halves in the first symbol. A fraction part of the frequency offset FO is then calculated from a phase difference between the two halves of the first training symbol. Then, the received signal is compensated for the fraction part of FO, and, an integer part of the FO is obtained by counting the shifted positions of the pilot-tone peak in the frequency domain.

Abstract translation: 具有两个相同的一半的训练符号以及中心频率的导频被用于定时同步和载波频率偏移估计。 通过找到第一符号中两个半部的互相关函数的峰值来实现定时同步。 然后根据第一训练符号的两半之间的相位差来计算频率偏移FO的分数部分。 然后，对FO的分数部分补偿接收到的信号，并且通过对频域中的导频音峰的偏移位置进行计数来获得FO的整数部分。

公开(公告)号：US09014568B2

公开(公告)日：2015-04-21

申请号：US13768487

申请日：2013-02-15

Applicant: NEC Laboratories America, Inc.

Inventor： Dayou Qian ,  Ting Wang

IPC: H04B10/00 ,  H04B10/04 ,  H04B10/06 ,  H04B10/27 ,  H04B10/61 ,  H04B10/50 ,  H04B10/40 ,  H04B10/272 ,  H04B10/516 ,  H04B10/2507 ,  H04B10/2513

CPC classification number: H04B10/27 ,  H04B10/2507 ,  H04B10/25137 ,  H04B10/272 ,  H04B10/40 ,  H04B10/50 ,  H04B10/516 ,  H04B10/61 ,  H04B10/613 ,  H04B10/616

Abstract: An optical access network with centralized digital optical line termination OLT including an optical line termination unit having a digital transmitter and a coherent receiver for downstream signal transmitting and upstream signal receiving, and at least one optical network unit ONU with transceiver functions for communicating with the OLT over an optical path, the ONU including intensity modulation and single photodiode detection, wherein the digital transmitter includes digital signal processing DSP, digital-to-analog conversion DAC and analog-to-digital conversion ADC functions that can be shared by all multiple ones of the ONU in the network, the DSP reducing or removing dispersion and non-linearity effects in the network and the coherent receiver enabling performance of the downstream stream signal transmitting to match that of the upstream signal receiving in the OLT.

Abstract translation: 具有集中数字光线路终端OLT的光接入网络，包括具有数字发射机的光线路终端单元和用于下行信号发射和上行信号接收的相干接收机，以及具有用于与OLT通信的收发机功能的至少一个光网络单元ONU 通过光路，ONU包括强度调制和单光电二极管检测，其中数字发射器包括数字信号处理DSP，数/模转换DAC和模数转换ADC功能，可由所有多个 在网络中的ONU，DSP减少或去除网络中的色散和非线性效应以及相干接收机，使下游流信号发送的性能能够匹配在OLT中接收的上行信号。

公开(公告)号：US20150093111A1

公开(公告)日：2015-04-02

申请号：US14504639

申请日：2014-10-02

Applicant: NEC Laboratories America, Inc.

Inventor： Ting Wang ,  Ryuji Aida ,  Philip Ji

IPC: H04Q11/00 ,  H04B10/80

CPC classification number: H04Q11/0005 ,  H04B10/80 ,  H04J14/0205 ,  H04J14/0212 ,  H04J14/0213 ,  H04J14/0221 ,  H04Q11/0062 ,  H04Q2011/0037

Abstract: Systems and methods for method for data transport using secure reconfigurable branching units, including receiving signals from a first trunk terminal and a second trunk terminal by branching units. Broadcasting is prevented for secure information delivery by dividing, within the branching units, the signals from the first trunk terminal and the second trunk terminal into three or more sections. Signals may be received from a branch terminal by one or more branching units using a single branch fiber pair, and the signals from the branch terminals may be divided into three or more groups of optical channels, wherein at least e of the channels includes dummy light. The divided signals from the first trunk terminal, the second trunk terminal, and dummy light from the branch terminal may be merged, and the merged signal sent to the branch terminal.

Abstract translation: 使用安全可重配置分支单元的数据传输方法的系统和方法，包括通过分支单元从第一中继线端子和第二干线端子接收信号。 通过在分支单元内将来自第一干线端子和第二干线端子的信号分成三个或更多个部分来防止广播，从而进行安全的信息传递。 可以通过使用单个分支光纤对的一个或多个分支单元从分支终端接收信号，并且来自分支终端的信号可以被划分为三组或更多组光信道，其中至少e个信道包括伪光 。 来自第一中继线端子，第二干线端子和来自分支端子的虚拟光的分频信号可以被合并，并且合并信号被发送到分支终端。

公开(公告)号：US20150071636A1

公开(公告)日：2015-03-12

申请号：US14479398

申请日：2014-09-08

Applicant: NEC Laboratories America, Inc.

Inventor： Junqiang Hu ,  Konstantinos Kanonakis ,  Ting Wang ,  Philip Ji

IPC: H04L12/825 ,  H04B10/40 ,  H04Q11/00 ,  H04L12/815

CPC classification number: H04L47/25 ,  H04B10/40 ,  H04L47/225 ,  H04Q11/0062 ,  H04Q2011/0086

Abstract: Methods and systems for variable rate control include determining a new communications rate in response to measured data traffic patterns. A receive change message is transmitted to a receiver that triggers the receiver to wait for an end of transmission (EoT) message and to set a new communications rate. A transmit change message is transmitted to a transmitter that triggers the transmitter to send the EoT message to the receiver, to set the new communications rate, and to send a start of transmission (SoT) message to the receiver before resuming data communications.

Abstract translation: 用于可变速率控制的方法和系统包括响应于测量的数据业务模式来确定新的通信速率。 接收改变消息被发送到触发接收机等待传输结束（EoT）消息并设置新的通信速率的接收机。 发送改变消息被发送到发射机，触发发射机向接收机发送EoT消息，设置新的通信速率，并在恢复数据通信之前向接收机发送开始的发送（SoT）消息。

公开(公告)号：US08917998B2

公开(公告)日：2014-12-23

申请号：US13649161

申请日：2012-10-11

Applicant: NEC Laboratories America, Inc.

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

IPC: H04B10/04 ,  H04B10/12 ,  H04B10/50 ,  H04J14/06 ,  H04B10/556

CPC classification number: H04B10/5055 ,  H04B10/5561 ,  H04J14/06

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US08880985B2

公开(公告)日：2014-11-04

申请号：US13646470

申请日：2012-10-05

Applicant: NEC Laboratories America, Inc.

Inventor： Junqiang Hu ,  Lei Xu ,  Ting Wang

IPC: H03M13/03 ,  H03M13/13 ,  H03M13/11

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。

公开(公告)号：US08873958B2

公开(公告)日：2014-10-28

申请号：US13628320

申请日：2012-09-27

Applicant: NEC Laboratories America, Inc.

Inventor： Jingjing Zhang ,  Ting Wang ,  Naoto Maeda

IPC: H04J14/02 ,  H04Q11/00 ,  H04L12/12

CPC classification number: H04L12/12 ,  H04Q11/0067 ,  H04Q2011/0079 ,  Y02D50/40 ,  Y02D50/42

Abstract: A method sets certain downstream traffic scheduling rules at an optical line terminal OLT and certain sleep control rules at optical network units ONUs. Both downstream traffic scheduling rules and sleep control rules are common information owned by both the OLT and ONUs. The method sets the traffic scheduling rules that each ONU is allocated with some time slots every cycle if the ONU has downstream traffic. Rather than using a control message to notify ONUs with their queue status, the method lets ONUs infer whether its downstream queue is empty or not based on downstream traffic scheduling and lets the OLT infer the status of an ONU based on sleep control rules.

Abstract translation: 一种方法在光线路终端OLT设置某些下行流量调度规则，并在光网络单元ONU设置某些睡眠控制规则。 下行流量调度规则和睡眠控制规则都是OLT和ONU拥有的常用信息。 如果ONU具有下行流量，则该方法每个周期设置每个ONU分配了一些时隙的流量调度规则。 该方法不是使用控制消息通知其具有队列状态的ONU，而是使ONU根据下游业务调度来推断其下行队列是否为空，并允许OLT根据睡眠控制规则来推断ONU的状态。

公开(公告)号：US20140147120A1

公开(公告)日：2014-05-29

申请号：US14085000

申请日：2013-11-20

Applicant: NEC Laboratories America, Inc.

Inventor： Ankitkumar N. Patel ,  Philip Nan Ji ,  Ting Wang

IPC: H04J14/02

CPC classification number: H04J14/0238 ,  H04J14/0257 ,  H04J14/0267 ,  H04L45/16

Abstract: The present invention is directed to a solution for grooming multicast traffic in flexible optical wavelength division multiplexing WDM networks. The invention includes a solution for grooming multicast traffic in flexible optical wavelength division multiplexing networks into a solving a multicast routing sub-problem, solving a a grooming sub-problem; and solving a wavelength assignment and spectrum allocation sub-problem.

Abstract translation: 本发明涉及一种用于在柔性光波分复用WDM网络中整理组播业务的解决方案。 本发明包括将柔性光波分复用网络中的组播流量整理为解决组播路由子问题，解决梳理子问题的解决方案; 并解决波长分配和频谱分配子问题。

公开(公告)号：US20130259174A1

公开(公告)日：2013-10-03

申请号：US13855168

申请日：2013-04-02

Applicant: NEC LABORATORIES AMERICA, INC.

Inventor： Dayou Qian ,  Ting Wang

IPC: H04L7/00

CPC classification number: H04L7/0079 ,  H04B10/6165 ,  H04B2210/075 ,  H04L27/223 ,  H04L27/2272 ,  H04L27/26 ,  H04L27/2657 ,  H04L27/2671 ,  H04L27/2675 ,  H04L27/2697 ,  H04L2027/0026

Abstract: A method for phase noise mitigation for a coherent receiver in either an OFDM or single carrier based transmission system including applying a frequency offset and coarse phase noise compensation based on a radio frequency RF tone or using a phase lock loop PLL m-th power procedure, responsive to a signal from a digital signal processed transmission with an added pilots signal over an optical system, applying fine phase noise compensation based on comparison of the pilots signal in a time domain, removing the pilots, and demodulating the remaining pilotless signal.

Abstract translation: 一种用于在基于OFDM或单载波的传输系统中的相干接收机的相位噪声减轻的方法，包括基于射频RF频调应用频偏和粗相位噪声补偿或使用锁相环PLL第m个功率过程， 响应来自具有在光学系统上添加的导频信号的数字信号处理的传输的信号，基于时域中的导频信号的比较，去除导频以及解调剩余的无引导信号来应用精细相位噪声补偿。

公开(公告)号：US20130148963A1

公开(公告)日：2013-06-13

申请号：US13712465

申请日：2012-12-12

Applicant: NEC Laboratories America, Inc.

Inventor： Milorad Cvijetic ,  Ivan B. Djordjevic ,  Neda Cvijetic ,  Ting Wang

IPC: H04J14/04

CPC classification number: H04J14/04 ,  H04B10/2581 ,  H04B10/532 ,  H04B10/548

Abstract: An optical network includes a multidimensional coder and modulator for handling multiple-in-multiple-out MIMO spatial lightpath properties and content of any specific supercarrier, a spatial mode multiplexer responsive to orthogonal frequency division multiplexing OFDM transmissions and the multidimensional coder, a spatial-spectral routing node coupled over a fiber link to the spatial mode multiplexer for performing switching granularity by a spatial mode reconnection, a multidimensional decoder and demodulator; and a spatial mode demultiplexer coupled over a fiber link to the spatial-spectral routing node and responsive to the multidimensional decoder and demodulator.

Abstract translation: 光网络包括用于处理多重多输出MIMO空间光路特性和任何特定超载波的内容的多维编码器和调制器，响应于正交频分复用OFDM传输的空间模式多路复用器和多维编码器，空间光谱 通过光纤链路耦合到空间模式多路复用器的路由节点，用于通过空间模式重新连接来执行交换粒度;多维解码器和解调器; 以及空间模式解复用器，其通过光纤链路耦合到空间光谱路由节点并响应于多维解码器和解调器。