公开(公告)号：EP3340723B1

公开(公告)日：2020-10-07

申请号：EP16839135.7

申请日：2016-08-15

申请人： Nippon Telegraph And Telephone Corporation

发明人： KUDO Riichi ,  ABEYSEKERA Hirantha Sithira ,  MATSUI Munehiro ,  SHINOHARA Shoko ,  TAKATORI Yasushi ,  ICHIKAWA Takeo ,  MIZOGUCHI Masato

IPC分类号： H04W74/08 ,  H04W72/12 ,  H04W74/04 ,  H04W84/12

公开(公告)号：EP3166352B1

公开(公告)日：2020-04-08

申请号：EP15833321.1

申请日：2015-08-20

申请人： Nippon Telegraph and Telephone Corporation

发明人： KUDO Riichi ,  ABEYSEKERA Hirantha Sithira ,  TAKATORI Yasushi ,  ICHIKAWA Takeo ,  ASAI Yusuke ,  MIZOGUCHI Masato

IPC分类号： H04W16/14 ,  H04W76/10

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：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：EP2690895B1

公开(公告)日：2015-12-30

申请号：EP12776532.9

申请日：2012-04-25

申请人： Nippon Telegraph And Telephone Corporation

发明人： ASAI Yusuke ,  KUDO Riichi ,  ICHIKAWA Takeo ,  INOUE Yasuhiko ,  ABEYSEKERA Hirantha Sithira ,  MIZOGUCHI Masato

IPC分类号： H04W76/00 ,  H04W8/18 ,  H04B7/04 ,  H04L12/18

CPC分类号： H04W72/04 ,  H04B7/0452 ,  H04L1/00 ,  H04L12/18 ,  H04L12/185 ,  H04L61/2046 ,  H04L61/2069 ,  H04W8/186 ,  H04W24/02 ,  H04W52/00 ,  H04W76/11 ,  H04W76/40 ,  H04W88/08

摘要： In a system which performs wireless communication from an access point to stations using group identification information, the frequency of uses of group identification information that overlaps with that of another access point is reduced. An association between a station apparatus included in a group that is a target for simultaneous transmission and group identification information is stored, each station apparatus included in the group is notified of the group identification information, group identification information that is being used in the other access point apparatus is acquired, and if group identification information that is being used by the access point apparatus itself overlaps with the group identification information used by the other access point apparatus, the group identification information is changed so as to reduce the number of pieces of overlapping group identification information.

公开(公告)号：EP2426977B1

公开(公告)日：2015-06-10

申请号：EP10797186.3

申请日：2010-07-08

申请人： Nippon Telegraph And Telephone Corporation

发明人： MURAKAMI Tomoki ,  ICHIKAWA Takeo ,  KUDO Riichi ,  TAKATORI Yasushi ,  MIZOGUCHI Masato ,  HIRAGURI Takefumi ,  NISHIMORI Kentaro

IPC分类号： H04B7/10 ,  H04B7/02 ,  H04B7/04 ,  H04W72/08 ,  H04B7/06 ,  H04W72/04

CPC分类号： H04W72/0453 ,  H04B7/024 ,  H04B7/0452 ,  H04B7/0617 ,  H04B7/0697 ,  H04B17/318 ,  H04B17/382 ,  H04W72/046 ,  H04W72/082

公开(公告)号：EP2584720B1

公开(公告)日：2015-03-11

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 ,  H04B10/00 ,  H04J11/00 ,  H04L27/14 ,  H04B7/10 ,  H04L27/00 ,  H04B10/61

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.

公开(公告)号：EP2790338A1

公开(公告)日：2014-10-15

申请号：EP13740940.5

申请日：2013-01-23

申请人： Nippon Telegraph and Telephone Corporation

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

IPC分类号： H04J11/00 ,  H04B7/04 ,  H04J99/00 ,  H04W16/28

CPC分类号： H04L5/0053 ,  H04B7/0456 ,  H04B7/0617 ,  H04B7/068 ,  H04B7/0684 ,  H04J11/003 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/0204 ,  H04L25/0226 ,  H04L25/0232 ,  H04W72/0453 ,  H04W88/08

摘要： The number of OFDM symbols for channel estimation is reduced, overhead due to a pilot signal and a feedback signal is reduced, and the throughput is improved. A wireless apparatus is provided with: an iterative coefficient setting unit which sets, for a plurality of transmission ports, an iterative coefficient representing the number of transmission ports which share a plurality of frequency channels of training signals for estimating the channel information; a training signal generating unit which allocates frequency channels to each transmission port so as to satisfy the set iterative coefficient and generates L training signals based on the allocated frequency channels; a channel information acquiring unit which acquires channel information estimated from the training signals from a communication partner for the frequency channels allocated to each transmission port; and a channel information interpolating unit which interpolates channel information of a remaining frequency channel other than the frequency channels allocated to each transmission port from the acquired channel information.

摘要翻译： 用于信道估计的OFDM符号的数量减少，由于导频信号和反馈信号的开销降低，并且提高了吞吐量。 无线装置具有：迭代系数设定单元，对于多个发送端口，设定表示共享用于估计信道信息的训练信号的多个频率信道的发送端口的数量的迭代系数; 训练信号生成单元，其向每个发送端口分配频率信道，以满足所设置的迭代系数，并且基于所分配的频率信道生成L个训练信号; 频道信息获取单元，从分配给每个传输端口的频道的通信对方获取从训练信号估计的频道信息; 以及频道信息内插单元，其从所获取的频道信息中插入除了分配给每个传输端口的频道之外的剩余频道的频道信息。

公开(公告)号：EP2642781A1

公开(公告)日：2013-09-25

申请号：EP11842236.9

申请日：2011-11-15

申请人： Nippon Telegraph And Telephone Corporation

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

IPC分类号： H04W16/28 ,  H04B7/04 ,  H04J11/00 ,  H04J99/00 ,  H04W24/10 ,  H04W28/18

摘要： Communication quality is prevented from being deteriorated due to interference caused by low accuracy of channel information or interference from another base station or another wireless communication system. A wireless communication system includes a first wireless station including a plurality of antenna elements, transmission units corresponding to the plurality of antenna elements, and a transmission directivity control unit that controls transmission directivity of the plurality of antenna elements, and a plurality of second wireless stations each including a reception power measurement unit that measures a reception power. The transmission directivity control unit determines the transmission directivity of each of the plurality of antenna elements so that a signal does not reach a particular second wireless station among the plurality of second wireless stations. The transmission units generate wireless signals using the transmission directivity. The plurality of antenna elements transmit the generated wireless signals. The reception power measurement unit measures the reception power in a period that is set so that a signal does not reach the particular second wireless station, and detect the presence or absence of interference.

摘要翻译： 防止由于信道信息的低精度或来自另一基站或另一无线通信系统的干扰而引起的干扰而导致通信质量恶化。 无线通信系统包括：第一无线站，包括多个天线元件，对应于多个天线元件的发送单元;以及控制多个天线元件的发送方向性的发送方向性控制单元，以及多个第二无线站 每个包括测量接收功率的接收功率测量单元。 发送方向性控制单元确定多个天线元件中的每一个的发送方向性，使得在多个第二无线站中信号没有到达特定的第二无线站。 传输单元使用传输方向性产生无线信号。 多个天线元件发送生成的无线信号。 接收功率测量单元在被设置为使得信号不到达特定的第二无线站的时间段内测量接收功率，并且检测是否存在干扰。

公开(公告)号：EP2521293A1

公开(公告)日：2012-11-07

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： H04J11/00 ,  G02F2/00 ,  H04B10/02 ,  H04B10/04 ,  H04B10/06 ,  H04B10/142 ,  H04B10/152 ,  H04B10/18 ,  H04J14/00 ,  H04J14/04 ,  H04J14/06

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

摘要： A polarization state of a transmission signal can be changed at a high speed based on a symbol-rate By switching a first switch, a second switch, and a third switch with time, one of an X-polarized wave_I-signal as a Y-polarized wave_I-signal, a signal caused by performing logical inversion for an X-polarized wave_I-signal, an X-polarized wave_Q-signal and a signal caused by logical inversion for an X-polarized wave_Q-singal is input to a second modulator. Further, by switching the first switch, the second switch and the third switch with time, the second modulator is input one of the X-polarized wave_I-singal as the Y-polarized wave_Q-signal, the X-polarized wave_I-signal, the signal caused by performing logical inversion for the X-polarized wave_I-signal, the X-polarized wave_Q-signal and the signal caused by performing logical inversion for the X-polarized wave_Q-signal. Thereby, a polarization state of a transmission signal can be changed at high speed based on a symbol-rate speed.

摘要翻译： 传输信号的偏振状态可以基于符号速率以高速度改变。通过随时间切换第一开关，第二开关和第三开关，X极化波I_信号之一作为Y轴， 通过对X偏振波I_信号进行逻辑反转而产生的信号，X偏振波Q信号以及由X偏振波Q_信号的逻辑反相引起的信号被输入到第二调制器。 此外，通过随时间切换第一开关，第二开关和第三开关，第二调制器输入X偏振波I-单位之一作为Y偏振波Q_信号，X偏振波I信号， 通过对X偏振波_I信号进行逻辑反转而产生的信号，X偏振波Q信号和由X偏振波Q_信号执行逻辑反相引起的信号。 由此，可以基于符号速度速度高速地改变发送信号的偏振状态。