-
11.发明申请公开(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。
-
12.发明授权公开(公告)号：US09160600B2
公开(公告)日：2015-10-13
申请号：US13381114
申请日：2010-07-15
申请人： Riichi Kudo , Takayuki Kobayashi , Koichi Ishihara , Yasushi Takatori , Hideyuki Nosaka , Munehiro Matsui , Masato Mizoguchi , Tadao Nakagawa , Etsushi Yamazaki , Akihide Sano , Yutaka Miyamoto , Eiji Yoshida
发明人： Riichi Kudo , Takayuki Kobayashi , Koichi Ishihara , Yasushi Takatori , Hideyuki Nosaka , Munehiro Matsui , Masato Mizoguchi , Tadao Nakagawa , Etsushi Yamazaki , Akihide Sano , Yutaka Miyamoto , Eiji Yoshida
CPC分类号： H04L27/2672 , H04L25/03159 , H04L27/2633 , H04L27/265 , H04L27/266 , H04L2025/03414
摘要： A frequency domain multiplexed signal receiving method which decodes received signals that are multiplexed in a frequency domain, includes: a digital signal acquisition step of acquiring digital signals from the received signals that are multiplexed in the frequency domain; an offset discrete Fourier transform step of applying an offset discrete Fourier transform to odd discrete point numbers based on the acquired digital signals; and a decode step of decoding frequency domain digital signals in the frequency domain obtained by the offset discrete Fourier transform, and that are the frequency domain digital signals of one or more frequency channels.
摘要翻译： 一种频域复用信号接收方法，对在频域中被复用的接收信号进行解码，包括：数字信号获取步骤，从在频域中复用的接收信号中获取数字信号; 偏移离散傅立叶变换步骤，基于所获取的数字信号将偏移离散付里叶变换应用于奇数离散点数; 以及解码步骤，对通过偏移离散付里叶变换获得的频域中的频域数字信号进行解码，并且其是一个或多个频率信道的频域数字信号。
-
13.发明授权公开(公告)号：US08929750B2
公开(公告)日：2015-01-06
申请号：US13318757
申请日：2010-05-18
申请人： Koichi Ishihara , Takayuki Kobayashi , Riichi Kudo , Yasushi Takatori , Munehiro Matsui , Masato Mizoguchi , Akihide Sano , Shogo Yamanaka , Etsushi Yamazaki , Yutaka Miyamoto , Eiji Yoshida , Tadao Nakagawa
发明人： Koichi Ishihara , Takayuki Kobayashi , Riichi Kudo , Yasushi Takatori , Munehiro Matsui , Masato Mizoguchi , Akihide Sano , Shogo Yamanaka , Etsushi Yamazaki , Yutaka Miyamoto , Eiji Yoshida , Tadao Nakagawa
IPC分类号： H04B10/06 , H04B10/2513 , H04B10/079 , H04B10/556 , H04B10/61 , H04L7/027
CPC分类号： H04B10/50 , H04B10/07951 , H04B10/2513 , H04B10/556 , H04B10/616 , H04B10/6161 , H04L7/027
摘要： To enable signal position detection, frequency offset compensation, clock offset compensation, and chromatic dispersion amount estimation in a communication system based on coherent detection using an optical signal, even on a signal having a great offset in an arrival time depending on a frequency due to chromatic dispersion. An optical signal transmitting apparatus generates specific frequency band signals having power concentrated on two or more specific frequencies and transmits a signal including the specific frequency band signals. An optical signal receiving apparatus converts a received signal into a digital signal, detects positions of the specific frequency band signals from the converted digital signal, estimates frequency positions of the detected specific frequency band signals, and detects a frequency offset between an optical signal receiving apparatus and an optical signal transmitting apparatus. Moreover, the optical signal receiving apparatus detects a clock offset between the optical signal receiving apparatus and the optical signal transmitting apparatus from an interval between the estimated frequency positions of the specific frequency band signals. Furthermore, the optical signal receiving apparatus estimates temporal positions of the detected specific frequency band signals and detects a chromatic dispersion amount from a difference between the temporal positions of the specific frequency band signals corresponding to different frequencies.
摘要翻译： 为了使基于使用光信号的相干检测的通信系统中的信号位置检测，频率偏移补偿，时钟偏移补偿和色散量估计，即使在到达时间上具有很大偏移的信号，这取决于由于 色散。 光信号发送装置产生具有集中在两个或更多个特定频率上的功率的特定频带信号，并发送包括特定频带信号的信号。 光信号接收装置将接收到的信号转换为数字信号，检测来自转换的数字信号的特定频带信号的位置，估计检测到的特定频带信号的频率位置，并检测光信号接收装置 和光信号发送装置。 此外，光信号接收装置从特定频带信号的估计频率位置之间的间隔检测光信号接收装置和光信号发送装置之间的时钟偏移。 此外，光信号接收装置估计检测到的特定频带信号的时间位置，并且根据与不同频率对应的特定频带信号的时间位置之间的差来检测色散量。
-
14.发明授权公开(公告)号：US08855485B2
公开(公告)日：2014-10-07
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
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功率来计算质心频率，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。
-
15.发明授权公开(公告)号：US08787769B2
公开(公告)日：2014-07-22
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
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。
-
16.发明申请公开(公告)号：US20120070159A1
公开(公告)日：2012-03-22
申请号：US13318757
申请日：2010-05-18
申请人： Koichi Ishihara , Takayuki Kobayashi , Riichi Kudo , Yasushi Takatori , Munehiro Matsui , Masato Mizoguchi , Akihide Sano , Shogo Yamanaka , Etsushi Yamazaki , Yutaka Miyamoto , Eiji Yoshida , Tadao Nakagawa
发明人： Koichi Ishihara , Takayuki Kobayashi , Riichi Kudo , Yasushi Takatori , Munehiro Matsui , Masato Mizoguchi , Akihide Sano , Shogo Yamanaka , Etsushi Yamazaki , Yutaka Miyamoto , Eiji Yoshida , Tadao Nakagawa
CPC分类号： H04B10/50 , H04B10/07951 , H04B10/2513 , H04B10/556 , H04B10/616 , H04B10/6161 , H04L7/027
摘要： To enable signal position detection, frequency offset compensation, clock offset compensation, and chromatic dispersion amount estimation in a communication system based on coherent detection using an optical signal, even on a signal having a great offset in an arrival time depending on a frequency due to chromatic dispersion. An optical signal transmitting apparatus generates specific frequency band signals having power concentrated on two or more specific frequencies and transmits a signal including the specific frequency band signals. An optical signal receiving apparatus converts a received signal into a digital signal, detects positions of the specific frequency band signals from the converted digital signal, estimates frequency positions of the detected specific frequency band signals, and detects a frequency offset between an optical signal receiving apparatus and an optical signal transmitting apparatus. Moreover, the optical signal receiving apparatus detects a clock offset between the optical signal receiving apparatus and the optical signal transmitting apparatus from an interval between the estimated frequency positions of the specific frequency band signals. Furthermore, the optical signal receiving apparatus estimates temporal positions of the detected specific frequency band signals and detects a chromatic dispersion amount from a difference between the temporal positions of the specific frequency band signals corresponding to different frequencies.
摘要翻译： 为了使基于使用光信号的相干检测的通信系统中的信号位置检测，频率偏移补偿，时钟偏移补偿和色散量估计，即使在到达时间上具有很大偏移的信号，这取决于由于 色散。 光信号发送装置产生具有集中在两个或更多个特定频率上的功率的特定频带信号，并发送包括特定频带信号的信号。 光信号接收装置将接收到的信号转换为数字信号，检测来自转换的数字信号的特定频带信号的位置，估计检测到的特定频带信号的频率位置，并检测光信号接收装置 和光信号发送装置。 此外，光信号接收装置从特定频带信号的估计频率位置之间的间隔检测光信号接收装置和光信号发送装置之间的时钟偏移。 此外，光信号接收装置估计检测到的特定频带信号的时间位置，并且根据与不同频率对应的特定频带信号的时间位置之间的差来检测色散量。
-
公开(公告)号：US08437638B2
公开(公告)日：2013-05-07
申请号：US12664745
申请日：2008-07-04
CPC分类号： H04B10/5053 , G02F1/0327 , G02F1/225 , H04B10/548 , H04B10/5561
摘要： An optical modulator and an optical transmission system convert continuous light of a multiple wavelength light source, which generates the continuous light with a fixed and complete phase but different frequencies, to a modulator driving signal so as to generate a light subcarrier with each frequency at the center and modulate the continuous light to the light subcarrier by using the modulator driving signal. In the case where an optical modulation is carried out by an optical IQ-modulator, transmitting data, for example, is converted to two parallel data A(t) and B(t), an I phase signal, in which the data A(t)+B(t) are modulated with a clock signal with a frequency ω, and a Q phase signal, in which the data A(t)−B(t) are modulated with a clock signal with a π/2 phase shifted, are generated, and the I phase signal and the Q phase signal are applied to electrodes of the optical IQ-modulator, respectively.
摘要翻译： 光调制器和光传输系统将连续的光转换成多波长光源，其将具有固定且完全相位但不同频率的连续光产生到调制器驱动信号，以便产生具有每个频率的光副载波 通过使用调制器驱动信号将连续光调制到光副载波上。 在通过光学IQ调制器进行光学调制的情况下，例如将数据转换为两个并行数据A（t）和B（t），其中数据A（ t）+ B（t）用具有频率ω的时钟信号和Q相信号进行调制，其中数据A（t）-B（t）用具有pi / 2相移的时钟信号 ，并且将I相信号和Q相信号分别施加到光学IQ调制器的电极。
-
公开(公告)号：US20100220376A1
公开(公告)日：2010-09-02
申请号：US12664745
申请日：2008-07-04
IPC分类号： G02B26/00
CPC分类号： H04B10/5053 , G02F1/0327 , G02F1/225 , H04B10/548 , H04B10/5561
摘要： An optical modulator and an optical transmission system convert continuous light of a multiple wavelength light source, which generates the continuous light with a fixed and complete phase but different frequencies, to a modulator driving signal so as to generate a light subcarrier with each frequency at the center and modulate the continuous light to the light subcarrier by using the modulator driving signal. In the case where an optical modulation is carried out by an optical IQ-modulator, transmitting data, for example, is converted to two parallel data A(t) and B(t), an I phase signal, in which the data A(t)+B(t) are modulated with a clock signal with a frequency ω, and a Q phase signal, in which the data A(t)−B(t) are modulated with a clock signal with a π/2 phase shifted, are generated, and the I phase signal and the Q phase signal are applied to electrodes of the optical IQ-modulator, respectively.
摘要翻译： 光调制器和光传输系统将连续的光转换成多波长光源，其将具有固定且完全相位但不同频率的连续光产生到调制器驱动信号，以便产生具有每个频率的光副载波 通过使用调制器驱动信号将连续光调制到光副载波上。 在通过光学IQ调制器进行光学调制的情况下，例如将数据转换为两个并行数据A（t）和B（t），其中数据A（ t）+ B（t）用具有频率ω的时钟信号和Q相信号进行调制，其中数据A（t）-B（t）用具有＆pgr / 2相位的时钟信号 产生偏移，I相信号和Q相信号分别施加到光学IQ调制器的电极。
-
公开(公告)号：US20130308960A1
公开(公告)日：2013-11-21
申请号：US13983233
申请日：2012-02-07
IPC分类号： H04B1/10
CPC分类号： H04B1/10 , H03H21/0012 , H03H2021/0092 , H04B10/616 , H04L25/03261
摘要： A parameter of an adaptive filter is optimized so that inter-symbol interference having an amount corresponding to an inserted fixed filter remains. A digital signal processing apparatus which is included in an optical signal receiver and processes a digital signal converted from an optical signal is provided with: a linear adaptive filter which applies a dynamically controllable linear transfer function to the digital signal; a maximum likelihood sequence decoder which applies a transfer function of a transmission-path model to a plurality of signal sequence candidates to generate a plurality of reference signals, and decodes a reception signal using maximum likelihood sequence estimation which evaluates the differences between an output signal of the linear adaptive filter and the reference signals to estimate the most likely transmission time sequence; a signal regenerator which generates a signal corresponding to decoded data from the maximum likelihood sequence decoder; a feedback distortion adding filter which adds distortion that is equivalent to the transmission-path model used in the maximum likelihood sequence decoder to an output signal of the signal regenerator; and an adaptive equalization filter control block which updates a tap coefficient of the linear adaptive filter in accordance with an LMS algorithm using the difference between a target signal that is an output signal of the feedback distortion adding filter and the digital signal as an error signal.
摘要翻译： 对自适应滤波器的参数进行优化，使得具有与插入的固定滤波器相对应的量的符号间干扰保留。 包括在光信号接收机中并处理从光信号转换的数字信号的数字信号处理装置具有：向数字信号施加动态可控线性传递函数的线性自适应滤波器; 最大似然序列解码器，其将传输路径模型的传递函数应用于多个信号序列候选以产生多个参考信号，并且使用最大似然序列估计解码接收信号，所述最大似然序列估计用于评估接收信号的输出信号 线性自适应滤波器和参考信号来估计最可能的传输时间序列; 信号再生器，其生成对应于来自最大似然序列解码器的解码数据的信号; 将与最大似然序列解码器中使用的传输路径模型相当的失真与信号再生器的输出信号相加的反馈失真相加滤波器; 以及自适应均衡滤波器控制块，其使用作为反馈失真相加滤波器的输出信号的目标信号和数字信号之间的差作为误差信号，根据LMS算法来更新线性自适应滤波器的抽头系数。
-
公开(公告)号：US08977141B2
公开(公告)日：2015-03-10
申请号：US13983233
申请日：2012-02-07
CPC分类号： H04B1/10 , H03H21/0012 , H03H2021/0092 , H04B10/616 , H04L25/03261
摘要： A parameter of an adaptive filter is optimized so that inter-symbol interference having an amount corresponding to an inserted fixed filter remains. A digital signal processing apparatus which is included in an optical signal receiver and processes a digital signal converted from an optical signal is provided with: a linear adaptive filter which applies a dynamically controllable linear transfer function to the digital signal; a maximum likelihood sequence decoder which applies a transfer function of a transmission-path model to a plurality of signal sequence candidates to generate a plurality of reference signals, and decodes a reception signal using maximum likelihood sequence estimation which evaluates the differences between an output signal of the linear adaptive filter and the reference signals to estimate the most likely transmission time sequence; a signal regenerator which generates a signal corresponding to decoded data from the maximum likelihood sequence decoder; a feedback distortion adding filter which adds distortion that is equivalent to the transmission-path model used in the maximum likelihood sequence decoder to an output signal of the signal regenerator; and an adaptive equalization filter control block which updates a tap coefficient of the linear adaptive filter in accordance with an LMS algorithm using the difference between a target signal that is an output signal of the feedback distortion adding filter and the digital signal as an error signal.
摘要翻译： 对自适应滤波器的参数进行优化，使得具有与插入的固定滤波器相对应的量的符号间干扰保留。 包括在光信号接收机中并处理从光信号转换的数字信号的数字信号处理装置具有：向数字信号施加动态可控线性传递函数的线性自适应滤波器; 最大似然序列解码器，其将传输路径模型的传递函数应用于多个信号序列候选以产生多个参考信号，并且使用最大似然序列估计解码接收信号，所述最大似然序列估计用于评估接收信号的输出信号 线性自适应滤波器和参考信号来估计最可能的传输时间序列; 信号再生器，其生成对应于来自最大似然序列解码器的解码数据的信号; 将与最大似然序列解码器中使用的传输路径模型相当的失真与信号再生器的输出信号相加的反馈失真相加滤波器; 以及自适应均衡滤波器控制块，其使用作为反馈失真相加滤波器的输出信号的目标信号和数字信号之间的差作为误差信号，根据LMS算法更新线性自适应滤波器的抽头系数。
-
-
-
-
-
-
-
-
-
搜索结果
82 条记录 (耗时 0.03 秒)
