公开(公告)号：US20130039205A1

公开(公告)日：2013-02-14

申请号：US13583340

申请日：2011-03-10

申请人： Tomoki Murakami ,  Riichi Kudo ,  Takeo Ichikawa ,  Yasushi Takatori ,  Munehiro Matsui ,  Yusuke Asai ,  Masato Mizoguchi

发明人： Tomoki Murakami ,  Riichi Kudo ,  Takeo Ichikawa ,  Yasushi Takatori ,  Munehiro Matsui ,  Yusuke Asai ,  Masato Mizoguchi

IPC分类号： H04W52/24

CPC分类号： H04W72/082 ,  H04B5/00 ,  H04B7/0452 ,  H04B17/345 ,  H04L5/0055 ,  H04W52/243 ,  H04W72/0453

摘要： Provided are a wireless communication method, a base station, a wireless communication system and a communication apparatus whereby an interference power is calculated from an estimated propagation channel estimation result and the transmission power is controlled based on the interference power or the interference is suppressed by controlling the directivity, thereby increasing the transmission capacity. A propagation channel estimation circuit performs propagation channel estimation from a response signal transmitted from a terminal station and estimates a propagation channel estimation result. An interference power calculation circuit measures each interference power from a signal of each sub-carrier received by each of wireless units, and calculates an interference power for each sub-carrier from the propagation channel estimation result estimated by the propagation channel estimation circuit. When the calculated interference power is equal to or more than a predetermined threshold, an interference suppression signal generation circuit changes the transmission power and generates an interference suppression signal.

公开(公告)号：US08897163B2

公开(公告)日：2014-11-25

申请号：US13583340

申请日：2011-03-10

申请人： Tomoki Murakami ,  Riichi Kudo ,  Takeo Ichikawa ,  Yasushi Takatori ,  Munehiro Matsui ,  Yusuke Asai ,  Masato Mizoguchi

发明人： Tomoki Murakami ,  Riichi Kudo ,  Takeo Ichikawa ,  Yasushi Takatori ,  Munehiro Matsui ,  Yusuke Asai ,  Masato Mizoguchi

IPC分类号： G01R31/08 ,  H04B5/00 ,  H04B7/04 ,  H04W72/08 ,  H04B17/00 ,  H04W52/24 ,  H04W72/04

CPC分类号： H04W72/082 ,  H04B5/00 ,  H04B7/0452 ,  H04B17/345 ,  H04L5/0055 ,  H04W52/243 ,  H04W72/0453

摘要： Provided are a wireless communication method, a base station, a wireless communication system and a communication apparatus whereby an interference power is calculated from an estimated propagation channel estimation result and the transmission power is controlled based on the interference power or the interference is suppressed by controlling the directivity, thereby increasing the transmission capacity. A propagation channel estimation circuit performs propagation channel estimation from a response signal transmitted from a terminal station and estimates a propagation channel estimation result. An interference power calculation circuit measures each interference power from a signal of each sub-carrier received by each of wireless units, and calculates an interference power for each sub-carrier from the propagation channel estimation result estimated by the propagation channel estimation circuit. When the calculated interference power is equal to or more than a predetermined threshold, an interference suppression signal generation circuit changes the transmission power and generates an interference suppression signal.

摘要翻译： 提供了一种无线通信方法，基站，无线通信系统和通信装置，由此根据估计的传播路径估计结果计算干扰功率，并且基于干扰功率来控制发送功率，或者通过控制来抑制干扰 方向性，从而增加传输能力。 传播路径估计电路根据从终端发送的响应信号进行传播路径估计，并估计传播路径估计结果。 干扰功率计算电路根据由每个无线单元接收的每个子载波的信号来测量每个干扰功率，并且根据由传播信道估计电路估计的传播路径估计结果来计算每个副载波的干扰功率。 当所计算的干扰功率等于或大于预定阈值时，干扰抑制信号产生电路改变发射功率并产生干扰抑制信号。

公开(公告)号：US09276652B2

公开(公告)日：2016-03-01

申请号：US13881525

申请日：2011-11-15

申请人： Riichi Kudo ,  Munehiro Matsui ,  Tomoki Murakami ,  Takeo Ichikawa ,  Yusuke Asai ,  Koichi Ishihara ,  Tomoyuki Yamada ,  Masato Mizoguchi

发明人： Riichi Kudo ,  Munehiro Matsui ,  Tomoki Murakami ,  Takeo Ichikawa ,  Yusuke Asai ,  Koichi Ishihara ,  Tomoyuki Yamada ,  Masato Mizoguchi

IPC分类号： H04B7/04 ,  H04L5/00 ,  H04B7/06 ,  H04W16/28 ,  H04W24/10 ,  H04B17/318

CPC分类号： H04B7/0452 ,  H04B7/0617 ,  H04B7/0632 ,  H04B17/318 ,  H04L5/0023 ,  H04L5/0053 ,  H04L5/0057 ,  H04W16/28 ,  H04W24/10

摘要： A wireless communication system includes a first wireless station including antenna elements, transmission units corresponding to the antenna elements, and a transmission directivity control unit that controls transmission directivity of the antenna elements, and 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 antenna elements so that a signal does not reach a particular second wireless station among the second wireless stations. The transmission units generate wireless signals using the transmission directivity. The 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 by using the directivity, and detect the presence or absence of interference caused by the low accuracy of channel information.

摘要翻译： 无线通信系统包括：第一无线站，包括天线元件，与天线元件对应的发送单元，以及控制天线元件的发送方向性的发送方向性控制单元，以及各自包含测量 接收功率 发送方向性控制单元确定每个天线元件的发送方向性，使得信号在第二无线站中不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。 天线元件发送生成的无线信号。 接收功率测量单元在设定为使得信号通过使用方向性不到达特定的第二无线站的时间段中测量接收功率，并且检测由信道信息的低精度引起的干扰的存在或不存在。

公开(公告)号：US20130208619A1

公开(公告)日：2013-08-15

申请号：US13881525

申请日：2011-11-15

申请人： Riichi Kudo ,  Munehiro Matsui ,  Tomoki Murakami ,  Takeo Ichikawa ,  Yusuke Asai ,  Koichi Ishihara ,  Tomoyuki Yamada ,  Masato Mizoguchi

发明人： Riichi Kudo ,  Munehiro Matsui ,  Tomoki Murakami ,  Takeo Ichikawa ,  Yusuke Asai ,  Koichi Ishihara ,  Tomoyuki Yamada ,  Masato Mizoguchi

IPC分类号： H04B7/04

CPC分类号： H04B7/0452 ,  H04B7/0617 ,  H04B7/0632 ,  H04B17/318 ,  H04L5/0023 ,  H04L5/0053 ,  H04L5/0057 ,  H04W16/28 ,  H04W24/10

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：包括多个天线元件的第一无线站，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。 传输方向性控制单元确定多个天线元件中的每一个的传输方向性，使得信号在多个第二无线站中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：US20120099460A1

公开(公告)日：2012-04-26

申请号：US13375065

申请日：2010-07-08

申请人： Tomoki Murakami ,  Takeo Ichikawa ,  Riichi Kudo ,  Yasushi Takatori ,  Masato Mizoguchi ,  Takefumi Hiraguri ,  Kentaro Nishimori

发明人： Tomoki Murakami ,  Takeo Ichikawa ,  Riichi Kudo ,  Yasushi Takatori ,  Masato Mizoguchi ,  Takefumi Hiraguri ,  Kentaro Nishimori

IPC分类号： H04W24/00

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

摘要： This radio communication method is used to perform spatial multiplexing communication between cells in the overlap cell environment. In the MU-MIMO overlap cell environment, when a null is formed between a radio base station and a radio terminal station belonging to different cells, a first set of a “call signal” and a “response signal” is used to perform mutual detection with the radio base station and the radio terminal station belonging to different cells, and then a null is formed so as not to cause interference of radio waves between the radio base station and the radio terminal station belonging to different cells. At this time, the addresses of the radio base station and the radio terminal station are used to discriminate whether the radio base station and the radio terminal station belong to the same cell or different cells.

摘要翻译： 该无线通信方法用于在重叠小区环境中进行小区间的空间复用通信。 在MU-MIMO重叠小区环境中，当在无线基站和属于不同小区的无线终端站之间形成空值时，使用第一组“呼叫信号”和“响应信号”进行相互检测 无线电基站和无线电终端站属于不同的小区，然后形成一个零点，以免引起无线电基站和属于不同小区的无线电终端站之间的无线电波的干扰。 此时，无线基站和无线终端站的地址用于区分无线基站和无线终端站是否属于同一小区或不同的小区。

公开(公告)号：US08830965B2

公开(公告)日：2014-09-09

申请号：US13375065

申请日：2010-07-08

申请人： Tomoki Murakami ,  Takeo Ichikawa ,  Riichi Kudo ,  Yasushi Takatori ,  Masato Mizoguchi ,  Takefumi Hiraguri ,  Kentaro Nishimori

发明人： Tomoki Murakami ,  Takeo Ichikawa ,  Riichi Kudo ,  Yasushi Takatori ,  Masato Mizoguchi ,  Takefumi Hiraguri ,  Kentaro Nishimori

IPC分类号： H04W4/00

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

摘要： This radio communication method is used to perform spatial multiplexing communication between cells in the overlap cell environment. In the MU-MIMO overlap cell environment, when a null is formed between a radio base station and a radio terminal station belonging to different cells, a first set of a “call signal” and a “response signal” is used to perform mutual detection with the radio base station and the radio terminal station belonging to different cells, and then a null is formed so as not to cause interference of radio waves between the radio base station and the radio terminal station belonging to different cells. At this time, the addresses of the radio base station and the radio terminal station are used to discriminate whether the radio base station and the radio terminal station belong to the same cell or different cells.

摘要翻译： 该无线通信方法用于在重叠小区环境中进行小区间的空间复用通信。 在MU-MIMO重叠小区环境中，当在无线基站和属于不同小区的无线终端站之间形成空值时，使用第一组“呼叫信号”和“响应信号”进行相互检测 无线电基站和无线电终端站属于不同的小区，然后形成一个零点，以免引起无线电基站和属于不同小区的无线电终端站之间的无线电波的干扰。 此时，无线基站和无线终端站的地址用于区分无线基站和无线终端站是否属于同一小区或不同的小区。

公开(公告)号：US08934782B2

公开(公告)日：2015-01-13

申请号：US13576902

申请日：2011-02-03

申请人： Tadao Nakagawa ,  Etsushi Yamazaki ,  Koichi Ishihara ,  Takayuki Kobayashi ,  Riichi Kudo ,  Yasushi Takatori ,  Munehiro Matsui ,  Yutaka Miyamoto ,  Akihide Sano ,  Eiji Yoshida ,  Masato Mizoguchi

发明人： Tadao Nakagawa ,  Etsushi Yamazaki ,  Koichi Ishihara ,  Takayuki Kobayashi ,  Riichi Kudo ,  Yasushi Takatori ,  Munehiro Matsui ,  Yutaka Miyamoto ,  Akihide Sano ,  Eiji Yoshida ,  Masato Mizoguchi

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

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-signal 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-signal 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： 传输信号的极化状态可以基于符号速率高速度地改变。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信号执行逻辑反相，X偏振波Q_信号和由X偏振波Q_信号的逻辑反相引起的信号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极化波I_信号之一作为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引起的信号，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。 因此，可以基于符号速率速度高速地改变发送信号的偏振状态。

公开(公告)号：US20120099864A1

公开(公告)日：2012-04-26

申请号：US13380432

申请日：2010-07-14

申请人： Koichi Ishihara ,  Takayuki Kobayashi ,  Riichi Kudo ,  Yasushi Takatori ,  Munehiro Matsui ,  Masato Mizoguchi ,  Tadao Nakagawa ,  Etsushi Yamazaki ,  Akihide Sano ,  Yutaka Miyamoto ,  Eiji Yoshida ,  Shogo Yamanaka

发明人： Koichi Ishihara ,  Takayuki Kobayashi ,  Riichi Kudo ,  Yasushi Takatori ,  Munehiro Matsui ,  Masato Mizoguchi ,  Tadao Nakagawa ,  Etsushi Yamazaki ,  Akihide Sano ,  Yutaka Miyamoto ,  Eiji Yoshida ,  Shogo Yamanaka

IPC分类号： H04J14/06 ,  H04B10/00

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： 为了补偿在使用光信号的相干检测的通信系统中由光纤传输引起的色散，使用特定的频带信号来使得能够估计色散值。 色散值计算装置具有：信号分配电路，其将由光信号发送装置发送的光信号的接收光信号转换成的数字信号分配成多个信号序列，其中已知信号 将多个特定频率的集中频率分量附加到从发送数据序列生成的信号上; 多个频带滤波器电路，每个频带通滤波器电路仅分离由信号分配电路分配的每个信号序列中包含已知信号的多个特定频率分量中的每一个，并且使每个特定频率分量 通过 多个功率计算电路，被设置为分别对应于所述多个频带滤波器电路，并且计算从相应的频带滤波器电路输出的信号的功率值; 延迟时间计算电路，分别从多个功率计算电路输出的功率值的信号序列中分别检测功率达到功率超过预定阈值的最大值或多次的时间，并且将延迟时间计算电路 ; 以及色散值计算电路，其基于延迟时间计算电路的时间的比较结果来计算色散值。

公开(公告)号：US20130028595A1

公开(公告)日：2013-01-31

申请号：US13640114

申请日：2011-04-14

申请人： Tadao Nakagawa ,  Yasushi Takatori ,  Riichi Kudo ,  Munehiro Matsui ,  Koichi Ishihara ,  Takayuki Kobayashi ,  Etsushi Yamazaki ,  Akihide Sano ,  Eiji Yoshida ,  Masato Mizoguchi ,  Yutaka Miyamoto

发明人： Tadao Nakagawa ,  Yasushi Takatori ,  Riichi Kudo ,  Munehiro Matsui ,  Koichi Ishihara ,  Takayuki Kobayashi ,  Etsushi Yamazaki ,  Akihide Sano ,  Eiji Yoshida ,  Masato Mizoguchi ,  Yutaka Miyamoto

IPC分类号： H04B10/08

CPC分类号： H04L27/2657 ,  H04L27/2676 ,  H04L27/2684

摘要： When a circuit that calculates a frequency offset using a shape of a frequency spectrum is implemented by hardware, the circuit size can be reduced. A frequency offset estimating method for estimating the difference between a carrier frequency of a reception signal and the frequency of an output signal of a local oscillator includes performing a discrete Fourier transform on a reception signal previously sampled at a predetermined sampling frequency and outputting a frequency spectrum with a plurality of frequency components, calculating an average power of the frequency spectrum, calculating a threshold by adding a predetermined value to the average power or power obtained by multiplying the average power by a constant, performing 1-bit quantization on powers of the frequency components of the frequency spectrum based on the threshold, and calculating a centroid frequency by multiplying frequencies of the frequency components by powers of 1-bit quantized frequency components, calculating the sum of multiplied products, and dividing the sum of the products by the sum of the powers of the 1-bit quantized frequency components of the frequency spectrum.

摘要翻译： 当使用频谱的形状计算频率偏移的电路由硬件实现时，可以减小电路尺寸。 用于估计接收信号的载波频率与本地振荡器的输出信号的频率之间的差异的频率偏移估计方法包括对以预定采样频率预先采样的接收信号执行离散付里叶变换，并输出频谱 具有多个频率分量，计算频谱的平均功率，通过将平均功率或平均功率乘以常数获得的功率相加预定值来计算阈值，对频率的功率执行1比特量化 基于阈值的频谱的分量，并且通过将频率分量的频率乘以1比特量化频率分量的幂来计算质心频率，计算乘积的总和，并将乘积的和除以 1位量化频率分量的功率 频谱。

公开(公告)号：US08781029B2

公开(公告)日：2014-07-15

申请号：US13701963

申请日：2011-06-17

申请人： Tadao Nakagawa ,  Munehiro Matsui ,  Koichi Ishihara ,  Riichi Kudo ,  Takayuki Kobayashi ,  Etsushi Yamazaki ,  Akihide Sano ,  Eiji Yoshida ,  Masato Mizoguchi ,  Yutaka Miyamoto ,  Yasushi Takatori

发明人： Tadao Nakagawa ,  Munehiro Matsui ,  Koichi Ishihara ,  Riichi Kudo ,  Takayuki Kobayashi ,  Etsushi Yamazaki ,  Akihide Sano ,  Eiji Yoshida ,  Masato Mizoguchi ,  Yutaka Miyamoto ,  Yasushi Takatori

IPC分类号： H03K9/10 ,  H04L17/14

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： 提供一种频率偏移估计装置，其在估计作为接收信号的载波频率与本地振荡器的输出信号的频率之间的差的频率偏移时，适当地估计和补偿接收信号的频率偏移。 频率偏移估计装置将预先采样的接收信号以预定的采样频率转换成具有N个频率分量的频谱，将频谱的负频率分量的频带从1到N / 2限制，并且频带为正 频率分量从频谱的N / 2 + 1到N的频率分量计算已经经受频带限制的频谱的正频率分量的平方和的和的频率分量的平方和之和 已经进行了频带限制的频谱，以计算正频率分量的功率和负频率分量的功率，并且循环移位频域中的频谱的所有频率分量，直到频域中的频差的绝对值 正频率分量的功率和ne的功率 同步频率分量小于或等于预定阈值，并且基于偏移量来估计频率偏移，直到绝对值小于或等于阈值。