公开(公告)号：EP2725731B1

公开(公告)日：2018-07-18

申请号：EP12831376.4

申请日：2012-09-18

申请人： Nippon Telegraph And Telephone Corporation

发明人： KUDO Riichi ,  MURAKAMI Tomoki ,  ISHIHARA Koichi ,  ICHIKAWA Takeo ,  ASAI Yusuke ,  KUMAGAI Tomoaki ,  MIZOGUCHI Masato

IPC分类号： H04J99/00 ,  H04B7/04 ,  H04L25/02 ,  H04B7/06 ,  H04B7/0452 ,  H04B7/0417

CPC分类号： H04B7/0417 ,  H04B7/0452 ,  H04B7/0634 ,  H04L25/0204 ,  H04L25/0226

摘要： The number of training signals for channel estimation is reduced. A wireless communication method includes: a step of reading, by an access point apparatus, stored training weights for a station which performs channel estimation; a step of generating, by the access point apparatus, a weight training symbol by multiplying the training weights by a training symbol and transmitting the generated weight training symbol; a step of estimating, by a station apparatus, weight channel information from the received weight training symbol; a step of transmitting, by the station apparatus, the weight channel information to the access point apparatus; a step of calculating, by the access point apparatus, transmission weights using the received weight channel information and the stored training weights; a step of transmitting, by the access point apparatus, a data signal in accordance with the transmission weights; and a step of calculating and storing, by the access point apparatus, new training weights using the weight channel information and the stored training weights.

公开(公告)号：EP3094015A1

公开(公告)日：2016-11-16

申请号：EP15765440.1

申请日：2015-03-17

申请人： Nippon Telegraph and Telephone Corporation

发明人： OKAMOTO Seiji ,  ISHIHARA Koichi ,  YAMAZAKI Etsushi ,  YOSHIDA Mitsuteru ,  KATAOKA Tomoyoshi ,  YONENAGA Kazushige ,  KISAKA Yoshiaki ,  NAKAMURA Masanori ,  TOMIZAWA Masahito

IPC分类号： H04B10/077 ,  H04B10/2513 ,  H04B10/516 ,  H04J11/00 ,  H04L27/20 ,  H04L27/36

摘要： An optical signal transmission apparatus includes a modulation unit which modulates a transmission signal, a training signal sequence generation unit which generates a plurality of signal sequences having power concentrated in a plurality of different frequency bands, at least one of an amplitude and a phase of the plurality of signal sequences being modulated, as a training signal sequence, a signal multiplexing unit which appends the training signal sequence to the transmission signal, and an electro-optical conversion unit which converts a signal sequence obtained by appending the training signal sequence to the transmission signal into an optical signal and transmits the optical signal.

摘要翻译： 光信号传输装置包括：调制单元，其对发送信号进行调制;训练信号序列生成单元，生成具有集中在多个不同频带的功率的多个信号序列，所述训练信号序列生成单元的振幅和相位中的至少一个 多个信号序列作为训练信号序列被调制为将训练信号序列附加到传输信号的信号复用单元，以及电光转换单元，其将通过将训练信号序列附加到传输获得的信号序列 信号转换为光信号并发送光信号。

公开(公告)号：EP2978145A1

公开(公告)日：2016-01-27

申请号：EP14768156.3

申请日：2014-03-14

申请人： Nippon Telegraph and Telephone Corporation

发明人： KISAKA Yoshiaki ,  ISHIHARA Koichi ,  TOMIZAWA Masahito ,  YAMAZAKI Etsushi

IPC分类号： H04B10/077 ,  H04J11/00 ,  H04J14/00 ,  H04J14/04 ,  H04J14/06 ,  H04J14/08

CPC分类号： H04J14/06 ,  H04B10/077 ,  H04B10/50 ,  H04B10/516 ,  H04B10/532 ,  H04B10/614 ,  H04B10/6162 ,  H04L27/2096

摘要： An optical transmission and reception system includes a transmitter (10) and receiver (20). The transmitter (10) differentially encodes control information to generate a differentially coded signal; uses the differentially coded signal to modulate a signal sequence in which electric power concentrates at a particular frequency; applies time-division multiplexing on a primary signal in one of two polarized wave components, and applies time-division multiplexing on a primary signal in the other polarized wave components and the signal sequence itself; polarization-multiplexes the both of the time-division multiplexed polarized waves into an optical signal; and transmits the optical signal to the receiver (20).
The receiver (20) polarization-demultiplexes the received optical signal to generate two polarized wave signals; extracts the signal sequence in which electric power concentrates at the particular frequency from the two polarized wave signals; and applies differential detection on the extracted signal sequence to demodulate the control information.

摘要翻译： 光传输和接收系统包括发射机（10）和接收机（20）。 发射机（10）差分编码控制信息以产生差分编码的信号; 使用差分编码信号来调制电力集中在特定频率的信号序列; 对两个极化波分量之一的主信号进行时分复用，对其他极化波分量和信号序列本身的主信号进行时分复用; 将时分复用偏振波的两个偏振复用为光信号; 并将光信号发送到接收器（20）。 接收器（20）对所接收的光信号进行偏振解复用以产生两个偏振波信号; 从两个极化波信号中提取电力集中在特定频率的信号序列; 对所提取的信号序列应用差分检测来解调控制信息。

公开(公告)号：EP2456097A1

公开(公告)日：2012-05-23

申请号：EP10799861.9

申请日：2010-07-14

申请人： Nippon Telegraph And Telephone Corporation

发明人： ISHIHARA Koichi ,  KOBAYASHI Takayuki ,  KUDO Riichi ,  TAKATORI Yasushi ,  MATSUI Munehiro ,  MIZOGUCHI Masato ,  NAKAGAWA Tadao ,  YAMAZAKI Etsushi ,  SANO Akihide ,  MIYAMOTO Yutaka ,  YOSHIDA Eiji ,  YAMANAKA Shogo

IPC分类号： H04B10/02 ,  H04B3/06 ,  H04B10/18

CPC分类号： H04B10/0775 ,  H04B3/06 ,  H04B10/25133

摘要： In order to compensate for chromatic dispersion caused by optical fiber transmission in a communication system with coherent detection using optical signals, specific frequency band signals are used to enable estimation of a chromatic dispersion value. The chromatic dispersion value calculating apparatus is provided with: a signal distributing circuit which distributes, into a plurality of signal sequences, an electrical digital signal converted from received optical signals of an optical signal transmitted by an optical signal transmitting apparatus, in which a known signal with concentrated frequency components of a plurality of specific frequencies is appended to a signal generated from a transmission data sequence; a plurality of frequency band pass filter circuits, each of which separating only each of a plurality of specific frequency components in which the known signal is included from each of the signal sequences distributed by the signal distributing circuit, and passing each of the specific frequency components therethrough; a plurality of power calculating circuits which are provided so as to correspond respectively to the plurality of frequency band pass filter circuits and which calculate power values of signals output from the corresponding frequency band pass filter circuits; a delay time calculating circuit which detects times at which power has the maximum value or times at which the power exceeds a predetermined threshold value, respectively from signal sequences of the power values output from the plurality of power calculating circuits, and which compares the detected times; and a chromatic dispersion value calculating circuit which calculates a chromatic dispersion value based on a comparison result of the times by the delay time calculating circuit.

摘要翻译： 为了补偿色散光纤通过传输与使用的光信号相干检测的通信系统中引起的，特定频带信号被用于使色散值的估计。 波长色散值计算装置设置有：信号分配电路用于分配成信号序列从由在光信号发送装置mitted的光信号的反式的接收的光信号转换电数字信号，多个在其中的已知信号 与被附加到从发送数据序列而生成的信号的特定频率的多个频率分量集中; 频率的带通滤波器电路的复数，每个的其中仅分离每个在其中已知信号从由所述信号分配的信号序列包括分配电路特定频率分量的多个，并且每个传递的特定频率分量的 那里通过; 的功率计算提供哪些电路，以便分别对应于频率带通滤波电路的多元性并且计算从相应的频率的带通滤波器电路的输出信号的功率值的多个; 其中在哪个功率检测时间的延迟时间计算电路具有最大值或倍其中功率从功率计算电路的所述多个输出的功率值的信号序列超过预定阈值，分别和其比较所检测到的次 ; 和色散值计算电路，其计算基于由所述延迟时间计算电路的时间的比较结果的色散值。

公开(公告)号：EP2521293B1

公开(公告)日：2016-04-13

申请号：EP11739836.2

申请日：2011-02-03

申请人： Nippon Telegraph And Telephone Corporation

发明人： NAKAGAWA Tadao ,  YAMAZAKI Etsushi ,  ISHIHARA Koichi ,  KOBAYASHI Takayuki ,  KUDO Riichi ,  TAKATORI Yasushi ,  MATSUI Munehiro ,  MIYAMOTO Yutaka ,  SANO Akihide ,  YOSHIDA Eiji ,  MIZOGUCHI Masato

IPC分类号： G02F1/01 ,  H04J14/06 ,  H04J11/00 ,  H04B10/532 ,  H04B10/60 ,  H04B10/50

CPC分类号： H04B10/5053 ,  G02F1/0136 ,  H04B10/532 ,  H04B10/60 ,  H04J14/06

公开(公告)号：EP2800416A1

公开(公告)日：2014-11-05

申请号：EP13746689.2

申请日：2013-02-04

申请人： Nippon Telegraph and Telephone Corporation

发明人： MURAKAMI Tomoki ,  ASAI Yusuke ,  KUDO Riichi ,  ISHIHARA Koichi ,  MIZOGUCHI Masato ,  ICHIKAWA Takeo

IPC分类号： H04W28/16 ,  H04B7/06 ,  H04B7/10 ,  H04J11/00 ,  H04J99/00 ,  H04W16/28

CPC分类号： H04B7/0452 ,  H04B7/024 ,  H04B7/0456 ,  H04B7/0617 ,  H04J11/0053 ,  H04L5/0035 ,  H04L5/005 ,  H04L27/2613 ,  H04L27/2626 ,  H04W28/16 ,  H04W88/08

摘要： Interference in preamble signals and pilot signals in cooperative transmission using interference suppressing technology is avoided. A wireless apparatus for transmitting a wireless signal on which directivity control has been performed to stations in a wireless system including at least one wireless apparatus is provided with a known signal generating unit which generates a known signal to be added to the wireless signal, a weighting processing unit which performs weighting on the known signal generated by the known signal generating unit, and a wireless processing unit which transmits the known signal on which the weighting has been performed by the weighting processing unit.

摘要翻译： 避免了使用干扰抑制技术的协作传输中的前导码信号和导频信号的干扰。 一种用于向包括至少一个无线装置的无线系统中的站发送方向性控制的无线信号进行发送的无线装置，具有产生要添加到无线信号的已知信号的已知信号生成部， 处理单元，其对由已知信号生成单元生成的已知信号进行加权，以及无线处理单元，其发送由加权处理单元执行了加权的已知信号。

公开(公告)号：EP2456097B1

公开(公告)日：2014-08-06

申请号：EP10799861.9

申请日：2010-07-14

申请人： Nippon Telegraph And Telephone Corporation

发明人： ISHIHARA Koichi ,  KOBAYASHI Takayuki ,  KUDO Riichi ,  TAKATORI Yasushi ,  MATSUI Munehiro ,  MIZOGUCHI Masato ,  NAKAGAWA Tadao ,  YAMAZAKI Etsushi ,  SANO Akihide ,  MIYAMOTO Yutaka ,  YOSHIDA Eiji ,  YAMANAKA Shogo

IPC分类号： H04B10/50

CPC分类号： H04B10/0775 ,  H04B3/06 ,  H04B10/25133

公开(公告)号：EP2456107B1

公开(公告)日：2014-02-26

申请号：EP10799887.4

申请日：2010-07-15

申请人： Nippon Telegraph and Telephone Corporation

发明人： KUDO Riichi ,  KOBAYASHI Takayuki ,  ISHIHARA Koichi ,  TAKATORI Yasushi ,  NOSAKA Hideyuki ,  MATSUI Munehiro ,  MIZOGUCHI Masato ,  NAKAGAWA Tadao ,  YAMAZAKI Etsushi ,  SANO Akihide ,  MIYAMOTO Yutaka ,  YOSHIDA Eiji

IPC分类号： H04L25/03 ,  H04L27/26

CPC分类号： H04L27/2672 ,  H04L25/03159 ,  H04L27/2633 ,  H04L27/265 ,  H04L27/266 ,  H04L2025/03414

公开(公告)号：EP2584720A1

公开(公告)日：2013-04-24

申请号：EP11795834.8

申请日：2011-06-17

申请人： Nippon Telegraph And Telephone Corporation

发明人： NAKAGAWA Tadao ,  MATSUI Munehiro ,  ISHIHARA Koichi ,  KUDO Riichi ,  KOBAYASHI Takayuki ,  YAMAZAKI Etsushi ,  SANO Akihide ,  YOSHIDA Eiji ,  MIZOGUCHI Masato ,  MIYAMOTO Yutaka ,  TAKATORI Yasushi

IPC分类号： H04B17/00 ,  H04B10/04 ,  H04B10/06 ,  H04B10/142 ,  H04B10/152 ,  H04J11/00

CPC分类号： H04L27/14 ,  H04B7/10 ,  H04B10/611 ,  H04B10/6164 ,  H04B17/327 ,  H04L27/2659 ,  H04L2027/0026 ,  H04L2027/0032 ,  H04L2027/0046

摘要： Provided is a frequency offset estimation apparatus that appropriately estimates and compensates for a frequency offset of a received signal when estimating the frequency offset which is the difference between a carrier frequency of the received signal and the frequency of an output signal of a local oscillator. The frequency offset estimation apparatus converts the received signal sampled in advance with a predetermined sampling frequency into a frequency spectrum having N frequency components, limits a frequency band of negative frequency components from 1 to N /2 of the frequency spectrum and a frequency band of positive frequency components from N /2+1 to N of the frequency spectrum, calculates the sum of the squares of the positive frequency components of the frequency spectrum that have been subjected to frequency band limitation and the sum of the squares of the negative frequency components of the frequency spectrum that have been subjected to frequency band limitation to calculate power of the positive frequency components and power of the negative frequency components, and cyclically shifts all frequency components of the frequency spectrum in a frequency domain until the absolute value of a power difference between the power of the positive frequency components and the power of the negative frequency components is less than or equal to a predetermined threshold value, and estimates the frequency offset based on a shift amount until the absolute value is less than or equal to the threshold value.

摘要翻译： 本发明提供一种频率偏移估计装置没有适当地估计和补偿的频率的接收信号的偏移在估计频率偏移的所有它是接收信号的载波频率和本机振荡器的输出信号的频率之间的差。 所述频率偏移估计装置预先与预定的采样频率到具有N个频率分量的频谱采样的接收的信号转换，从1至N / 2的频谱的和的正的频带限制负频率分量的频带 从N个频率分量/ 2 + 1到频谱的N，计算的频谱的正频率分量的平方的总和thathave进行了频率带限制和负频率分量的平方之和 频谱thathave进行了频率带宽限制来计算正频率分量的功率与负频率成分的功率，以及循环移位在频域中的频谱的所有频率成分，直到之间的功率差的绝对值 正频率分量的功率和的功率 负频率分量小于或等于预定的阈值，并估计频率偏移基于偏移量，直到绝对值小于或等于所述阈值。

公开(公告)号：EP2942917A1

公开(公告)日：2015-11-11

申请号：EP14752142.1

申请日：2014-02-13

申请人： Nippon Telegraph and Telephone Corporation

发明人： YOSHIDA Mitsuteru ,  YAMAZAKI Etsushi ,  OKAMOTO Seiji ,  UZAWA Hiroyuki ,  HORIKOSHI Kengo ,  ISHIHARA Koichi ,  KOBAYASHI Takayuki ,  KISAKA Yoshiaki ,  TOMIZAWA Masahito ,  FUJIWARA Naoki ,  KATAOKA Tomoyoshi ,  YONENAGA Kazushige

IPC分类号： H04L27/38 ,  H04B10/2507 ,  H04B10/61

CPC分类号： H04B10/6165 ,  H04B10/2507 ,  H04B10/516 ,  H04B10/61 ,  H04J14/06 ,  H04L27/38 ,  H04L2027/0067 ,  H04L2027/0095

摘要： An increase in circuit scale is suppressed and a phase variation caused in a transmission path or the like is compensated for. An optical transmission system includes: a pilot symbol detection unit which detects a plurality of pilot symbols intermittently inserted into a received complex electric field signal that is obtained through coherent detection for a received optical signal; an error signal computation unit which calculates a complex electric field error signal indicating a phase variation at each pilot symbol based on the pilot symbols detected by the pilot symbol detection unit and a predetermined reference symbol; a compensation electric field signal generation unit which estimates a phase variation between the pilot symbols in the received complex electric field signal using filter processing based on the complex electric field error signal calculated by the error signal computation unit; and a phase noise compensation unit which performs phase compensation for the received complex electric field signal based on the phase variation between the pilot symbols estimated by the compensation electric field signal generation unit.

摘要翻译： 抑制电路规模的增加，并补偿在传输路径等中引起的相位变化。 光传输系统包括：导频符号检测单元，其检测间接插入到通过接收的光信号的相干检测获得的接收复电场信号中的多个导频符号; 误差信号计算单元，其基于由导频符号检测单元检测的导频符号和预定的参考符号来计算指示每个导频符号的相位变化的复电场误差信号; 补偿电场信号生成单元，其基于由所述误差信号计算单元计算出的复电场误差信号，使用滤波处理来估计所述接收复电场信号中的导频符号之间的相位变化; 以及相位噪声补偿单元，其基于由补偿电场信号生成单元估计的导频符号之间的相位变化，对接收到的复数电场信号进行相位补偿。