公开(公告)号：US09106339B2

公开(公告)日：2015-08-11

申请号：US14026351

申请日：2013-09-13

申请人： FUJITSU LIMITED

发明人： Meng Yan ,  Zhenning Tao ,  Lei Li

IPC分类号： H04B10/00 ,  H04B10/2507 ,  H04L7/04 ,  H04L25/03 ,  H04L27/00

CPC分类号： H04B10/2507 ,  H04L7/042 ,  H04L25/03006 ,  H04L2027/0026

摘要： Embodiments of the present invention provide a coefficient determining apparatus, equalizer, receiver and transmitter. The coefficient determining apparatus comprises: a synchronizer configured to find a position of a training sequence from signals containing the training sequence received by a transmitter; and a first processor configured to set an initial tap coefficient of an equalizer according to the received signals and the training sequence; wherein in each polarization state, the training sequence comprises n pairs of training symbols, in the n pairs of training symbols, the training symbols of the same pair being identical, the training symbols of the different pair being different, a cyclic prefix and a cyclic postfix being respectively inserted before and after each pair of training symbols, and n being an integer greater than 1. By using the training sequence contained in the transmitted signals to determine an initial tap coefficient of the equalizer relatively close to the optimal value, channel damages may be approximately compensated, and the receiver is facilitated in further processing the signals.

摘要翻译： 本发明的实施例提供一种系数确定装置，均衡器，接收器和发射器。 该系数确定装置包括：同步器，被配置为从包含由发射机接收的训练序列的信号中找到训练序列的位置; 以及第一处理器，被配置为根据接收的信号和训练序列来设置均衡器的初始抽头系数; 其中在每个偏振态中，训练序列包括n对训练符号，在n对训练符号中，同一对的训练符号相同，不同对的训练符号不同，循环前缀和循环 在每对训练符号之前和之后分别插入后缀，并且n是大于1的整数。通过使用包含在所发送的信号中的训练序列来确定相对接近最佳值的均衡器的初始抽头系数，信道损伤 可以近似地补偿，并且便于进一步处理信号的接收机。

公开(公告)号：US08977119B2

公开(公告)日：2015-03-10

申请号：US13934722

申请日：2013-07-03

申请人： Fujitsu Limited

发明人： Meng Yan ,  Zhenning Tao

IPC分类号： H04B10/08 ,  H04B10/564 ,  H04B10/50

CPC分类号： H04B10/564 ,  H04B10/50575

摘要： The embodiments provide an automatic bias control method and apparatus for an optical transmitter. The apparatus includes: a detecting unit configured to monitor output optical power of an I/Q modulator of the optical transmitter; a calculating unit configured to calculate bias voltage indicating values of the I modulator, Q modulator and phase modulator of the I/Q modulator according to the output optical power and known modulation data; and an adjusting unit configured to adjust respectively Direct-Current (DC) bias voltages of the I modulator, Q modulator and phase modulator according to the bias voltage indicating values of the I modulator, Q modulator and phase modulator. With the embodiments, known modulation data are used to realize automatic bias control by monitoring the evenness of distribution of the power of output optical signals of the transmitter in the four quadrants of an I/Q plane.

摘要翻译： 这些实施例提供了一种用于光发射机的自动偏置控制方法和装置。 该装置包括：检测单元，被配置为监视光发射机的I / Q调制器的输出光功率; 计算单元，被配置为根据输出光功率和已知调制数据计算指示I / Q调制器的I调制器，Q调制器和相位调制器的值的偏置电压; 以及调整单元，被配置为根据指示I调制器，Q调制器和相位调制器的值的偏置电压分别调整I调制器，Q调制器和相位调制器的直流（DC）偏置电压。 利用实施例，已知的调制数据用于通过监视I / Q平面的四个象限中的发射机的输出光信号的功率分布均匀度来实现自动偏置控制。

公开(公告)号：US10009096B2

公开(公告)日：2018-06-26

申请号：US14879381

申请日：2015-10-09

申请人： FUJITSU LIMITED

发明人： Meng Yan ,  Yinwen Cao ,  Zhenning Tao

IPC分类号： H04B17/00 ,  H04B10/00 ,  H04B10/04 ,  H04B10/079 ,  H04B10/61 ,  H04L27/00 ,  H04L27/26

CPC分类号： H04B10/0795 ,  H04B10/61 ,  H04B10/6164 ,  H04L27/0014 ,  H04L27/26 ,  H04L2027/0016 ,  H04L2027/0046 ,  H04L2027/0065 ,  H04L2027/0073

摘要： A method, apparatus and system for estimating frequency offset that includes: a first calculating unit to calculate a correlation value of each of multiple sequences with different lengths according to a received signal containing the sequences with different lengths, where each of the sequences is repeatedly transmitted many times in the signal; a second calculating unit to calculate a decimal frequency according to the correlation value; a first determining unit to determine an integer frequency offset according to the decimal frequency offset to which each of the sequences corresponds; and a second determining unit to determine a total frequency offset according to the decimal frequency offset and the integer frequency offset.

公开(公告)号：US09264214B2

公开(公告)日：2016-02-16

申请号：US14048815

申请日：2013-10-08

申请人： Fujitsu Limited

发明人： Meng Yan ,  Zhenning Tao

IPC分类号： H04B10/40 ,  H04B10/66 ,  H04L7/00 ,  H04L7/033

CPC分类号： H04L7/0075 ,  H04B10/40 ,  H04B10/6165 ,  H04B10/66 ,  H04L7/0029 ,  H04L7/007 ,  H04L7/033

摘要： Embodiments of the present invention provide a phase detection method and apparatus. The apparatus comprises a phase detector, the phase detector comprising a calculation unit configured to calculate a phase difference according to a product of receiving power at different moments, so as to perform clock recovery by using the phase difference; wherein the receiving power is that obtained in sampling input signals at a predefined sampling rate, the predefined sampling rate being 2 times of a symbol rate. With the method and apparatus of the embodiments of the present invention, the problem that in case of a relatively large frequency difference or line width, or the transmitted signals are Nyquist signals of spectral widths close to the symbol rate, a conventional phase detection method will be invalid, is solved by calculating a phase difference only according to a product of receiving power at different moments.

摘要翻译： 本发明的实施例提供一种相位检测方法和装置。 所述装置包括相位检测器，所述相位检测器包括：计算单元，被配置为根据不同时刻的接收功率的乘积来计算相位差，以便通过使用相位差来执行时钟恢复; 其中接收功率是以预定采样率采样输入信号获得的功率，预定采样率是符号率的2倍。 利用本发明的实施例的方法和装置，在频率相对较大或线宽较大的情况下，或者发送的信号是接近符号率的频谱宽度的奈奎斯特信号的问题，常规相位检测方法将 无效，仅通过根据不同时刻的接收功率的乘积计算相位差来求解。

公开(公告)号：US08989324B2

公开(公告)日：2015-03-24

申请号：US14052070

申请日：2013-10-11

申请人： Fujitsu Limited

发明人： Meng Yan ,  Zhenning Tao

IPC分类号： H04L1/00 ,  H04L25/03 ,  H04L27/26 ,  H04J11/00

CPC分类号： H04L25/03 ,  H04J11/0046 ,  H04L25/03821 ,  H04L27/2647

摘要： Embodiments of the present invention provide a receiver and a receiving method. The receiver comprises: a branch forming unit a plurality of signal branches; each of the signal branches comprising a joint processing unit; and the joint processing unit being used to eliminate an inter-carrier interference of the subcarrier signal in a present signal branch and the subcarrier signals in other signal branches adjacent to the present signal branch. With the embodiments of the present invention, the inter-carrier interference may be eliminated and the performance of the system may be improved; and the sampling rate of the analog digital converter may also be lowered.

摘要翻译： 本发明的实施例提供一种接收机和接收方法。 接收机包括：分支形成单元，多个信号分支; 每个信号分支包括联合处理单元; 联合处理单元用于消除当前信号分支中的副载波信号和与本信号分支相邻的其它信号分支中的副载波信号的载波间干扰。 利用本发明的实施例，可以消除载波间干扰并且可以提高系统的性能; 并且模拟数字转换器的采样率也可能降低。

公开(公告)号：US09258077B2

公开(公告)日：2016-02-09

申请号：US14041640

申请日：2013-09-30

申请人： Fujitsu Limited

发明人： Meng Yan ,  Zhenning Tao

IPC分类号： H04B10/61 ,  H04J14/06 ,  H04L5/04 ,  H04L5/00 ,  H04L27/26

CPC分类号： H04J14/06 ,  H04B10/614 ,  H04B10/616 ,  H04B10/6163 ,  H04L5/0008 ,  H04L5/04 ,  H04L27/2607 ,  H04L27/2642 ,  H04L27/265 ,  H04L27/2655

摘要： The present invention relates to a butterfly filter coefficient setting method and device, a receiver, and a receiving method. The receiver is a DP-CO-OFDM receiver, comprising: a phase recovery device configured to perform a phase recovery of a received signal one OFDM symbol by one OFDM symbol, so as to obtain a phase-recovered first polarization signal and a phase-recovered second polarization signal; a butterfly filter configured to perform butterfly filtration of the phase-recovered first polarization signal and the phase-recovered second polarization signal one OFDM symbol by one OFDM symbol, so as to obtain a butterfly-filtered first polarization signal and a butterfly-filtered second polarization signal; a coefficient setting unit configured to set a filter coefficient used by the butterfly filter for the current OFDM symbol; and a data recovery device configured to recover data from the butterfly-filtered first polarization signal and the butterfly-filtered second polarization signal.

摘要翻译： 蝶形滤波器系数设定方法及装置本发明涉及一种蝶式滤波器系数设定方法及装置， 接收机是DP-CO-OFDM接收机，包括：相位恢复装置，被配置为执行一个OFDM符号的接收信号相位恢复一个OFDM符号，以获得相位恢复的第一极化信号和相位恢复装置， 恢复第二极化信号; 蝶形滤波器，被配置为对相位恢复的第一极化信号和相位恢复的第二极化信号执行蝶形滤波，一个OFDM符号乘以一个OFDM符号，以便获得蝴蝶滤波的第一极化信号和蝴蝶滤波的第二极化 信号; 系数设置单元，被配置为设置用于当前OFDM符号的蝶形滤波器使用的滤波器系数; 以及数据恢复装置，被配置为从蝶形滤波的第一极化信号和蝴蝶滤波的第二极化信号中恢复数据。