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    WAVELENGTH DISPERSION AMOUNT CALCULATION DEVICE, OPTICAL SIGNAL RECEPTION DEVICE, OPTICAL SIGNAL TRANSMISSION DEVICE, AND WAVELENGTH DISPERSION AMOUNT CALCULATION METHOD
    4.
    发明公开
    WAVELENGTH DISPERSION AMOUNT CALCULATION DEVICE, OPTICAL SIGNAL RECEPTION DEVICE, OPTICAL SIGNAL TRANSMISSION DEVICE, AND WAVELENGTH DISPERSION AMOUNT CALCULATION METHOD 有权
    装置：用于光信号的实用计算的波长色散量的转让和方法计算的波长色散量，接收装置中，DEVICE

    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。

    WIRELESS ENVIRONMENT INFORMATION COLLECTING SYSTEM AND METHOD
    6.
    发明公开
    WIRELESS ENVIRONMENT INFORMATION COLLECTING SYSTEM AND METHOD 审中-公开

    公开(公告)号：EP3334202A1

    公开(公告)日：2018-06-13

    申请号：EP16833002.5

    申请日：2016-08-01

    申请人： Nippon Telegraph and Telephone Corporation

    发明人： KUDO Riichi ,  ABEYSEKERA Hirantha Sithira ,  Matsui Munehiro ,  ICHIKAWA Takeo ,  MIZOGUCHI Masato

    IPC分类号： H04W24/00 ,  H04W84/12

    CPC分类号： H04W24/08 ,  H04W24/00 ,  H04W24/10 ,  H04W74/0816 ,  H04W84/12

    摘要： Provided is a wireless environment information collection system including a plurality of wireless stations performing wireless communication using a CSMA/CA scheme over a first frequency channel, and a wireless environment information management unit collecting wireless environment information of managed wireless stations being connected through a wired network or a wireless network among the plurality of wireless stations, in which the wireless environment information management unit includes a unit which generates and outputs a channel measurement frame which determines the wireless stations performing stopping of communication over the first frequency channel for a fixed time, starting of measuring channel utilization of the first frequency channel, or both the stopping of communication and the starting of measuring among the managed wireless stations, and the managed wireless stations include a unit which performs, at a time designated by the channel measurement frame from the wireless environment information management unit, the stopping of the communication over the first frequency channel, the measuring of the channel utilization of the first frequency channel, or both the stopping of the communication and the measuring of the channel utilization, and which outputs the obtained wireless environment information to the wireless environment information management unit through the wired network or the wireless network.

    WIRELESS COMMUNICATION METHOD AND BASE-STATION DEVICE
    10.
    发明公开
    WIRELESS COMMUNICATION METHOD AND BASE-STATION DEVICE 有权
    基督教基金会

    公开(公告)号：EP2725731A1

    公开(公告)日：2014-04-30

    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

    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.

    摘要翻译： 用于信道估计的训练信号的数量减少。 无线通信方法包括：由接入点装置读取进行信道估计的站的存储训练权重的步骤; 由接入点设备通过将训练权重乘以训练符号并发送生成的权重训练符号来生成加权训练符号; 通过站装置估计来自所接收的权重训练符号的权重信道信息的步骤; 由所述站装置向所述接入点装置发送权重信道信息的步骤; 由接入点装置使用所接收的加权信道信息和存储的训练权重来计算发送权重的步骤; 由接入点装置根据发送权重发送数据信号的步骤; 以及由接入点装置使用权重信道信息和存储的训练权重来计算和存储新的训练权重的步骤。