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公开(公告)号：US20130195208A1
公开(公告)日：2013-08-01
申请号：US13877916
申请日：2011-10-17
申请人： Daisuke Umehara , Yasuhiro Yabuuchi , Masahiro Morikura , Toshiya Hisada , Shinichi Ishiko , Satoshi Horihata , Tetsuo Morita
发明人： Daisuke Umehara , Yasuhiro Yabuuchi , Masahiro Morikura , Toshiya Hisada , Shinichi Ishiko , Satoshi Horihata , Tetsuo Morita
IPC分类号： H04B3/04
CPC分类号： H04B3/04 , H04B3/542 , H04B2203/5412 , H04B2203/5445 , H04B2203/5458 , H04B2203/547 , H04L27/2032
摘要： A power line communication system is provided in which the influence of the impulsive noise unexpectedly generated on a power line which is a communication medium can be reduced according to the characteristics of the impulsive noise by an existing method and power line communication can be realized without a hindrance. A transmitter is constituted by: a modulator for conveying a LIN data signal by a power line; a filter that allows a signal of a predetermined band to pass therethrough; and a sinusoidal wave outputter (sinusoidal wave in the figure). In contrast, the receiver is constituted by the sinusoidal wave outputter, the filter and a demodulator that performs demodulation. To the power line, a limiter that limits the amplitude of the propagating signal to a predetermined amplitude (reception signal amplitude) is connected.
摘要翻译： 提供了一种电力线通信系统，其中可以通过现有方法和电力线通信根据脉冲噪声的特性来减少意外产生的作为通信介质的电力线的脉冲噪声的影响，而不需要 障碍 发射机由以下部分构成：用于通过电力线传送LIN数据信号的调制器; 允许预定频带的信号通过的滤波器; 和正弦波输出器（图中的正弦波）。 相反，接收机由正弦波输出器，滤波器和执行解调的解调器构成。 连接电源线，将传播信号的振幅限制在规定的振幅（接收信号振幅）的限幅器。
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公开(公告)号：US09048888B2
公开(公告)日：2015-06-02
申请号：US13877916
申请日：2011-10-17
申请人： Daisuke Umehara , Yasuhiro Yabuuchi , Masahiro Morikura , Toshiya Hisada , Shinichi Ishiko , Satoshi Horihata , Tetsuo Morita
发明人： Daisuke Umehara , Yasuhiro Yabuuchi , Masahiro Morikura , Toshiya Hisada , Shinichi Ishiko , Satoshi Horihata , Tetsuo Morita
CPC分类号： H04B3/04 , H04B3/542 , H04B2203/5412 , H04B2203/5445 , H04B2203/5458 , H04B2203/547 , H04L27/2032
摘要： A power line communication system is provided in which the influence of the impulsive noise unexpectedly generated on a power line which is a communication medium can be reduced according to the characteristics of the impulsive noise by an existing method and power line communication can be realized without a hindrance. A transmitter is constituted by: a modulator for conveying a LIN data signal by a power line; a filter that allows a signal of a predetermined band to pass therethrough; and a sinusoidal wave outputter (sinusoidal wave in the figure). In contrast, the receiver is constituted by the sinusoidal wave outputter, the filter and a demodulator that performs demodulation. To the power line, a limiter that limits the amplitude of the propagating signal to a predetermined amplitude (reception signal amplitude) is connected.
摘要翻译： 提供了一种电力线通信系统，其中可以通过现有方法和电力线通信根据脉冲噪声的特性来减少意外产生的作为通信介质的电力线的脉冲噪声的影响，而不需要 障碍 发射机由以下部分构成：用于通过电力线传送LIN数据信号的调制器; 允许预定频带的信号通过的滤波器; 和正弦波输出器（图中的正弦波）。 相反，接收机由正弦波输出器，滤波器和执行解调的解调器构成。 连接电源线，将传播信号的振幅限制在预定幅度（接收信号振幅）的限幅器。
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3.发明授权Noise detection method, noise detection apparatus, simulation method, simulation apparatus, and communication system 有权噪声检测方法，噪声检测装置，仿真方法，仿真装置和通信系统公开(公告)号：US08548036B2
公开(公告)日：2013-10-01
申请号：US12801687
申请日：2010-06-21
CPC分类号： H04B17/0055 , G06N7/02 , H04B3/54 , H04B17/345
摘要： For voltage values (observed noise sequence) in an electronic power line (communication medium) which are obtained at a predetermined interval, initial values of noise characteristics based on a statistic of the observed noise sequence itself are decided by a moment method (S301 to S307), the noise characteristics (state transition probabilities and state noise power) for maximization of the likelihood of the observed noise sequence are obtained from the initial values by MAP (Maximum A Posteriori) estimation using a Baum-Welch algorithm (S309 to S312), a state sequence is estimated from the obtained noise characteristics, and an impulsive noise at each time point is detected.
摘要翻译： 对于以预定间隔获得的电子电力线（通信介质）中的电压值（观察到的噪声序列），基于观察到的噪声序列本身的统计量的噪声特性的初始值由力矩法（S301〜S307 ），通过使用Baum-Welch算法的MAP（最大后验）估计，从初始值获得用于使观测到的噪声序列的似然性最大化的噪声特性（状态转移概率和状态噪声功率）（S309〜S312） 从获得的噪声特性估计状态序列，并且检测每个时间点的脉冲噪声。
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4.发明申请Noise detection method, noise detection apparatus, simulation method, simulation apparatus, and communication system 有权噪声检测方法，噪声检测装置，仿真方法，仿真装置和通信系统公开(公告)号：US20100329320A1
公开(公告)日：2010-12-30
申请号：US12801687
申请日：2010-06-21
CPC分类号： H04B17/0055 , G06N7/02 , H04B3/54 , H04B17/345
摘要： For voltage values (observed noise sequence) in an electronic power line (communication medium) which are obtained at a predetermined interval, initial values of noise characteristics based on a statistic of the observed noise sequence itself are decided by a moment method (S301 to S307), the noise characteristics (state transition probabilities and state noise power) for maximization of the likelihood of the observed noise sequence are obtained from the initial values by MAP (Maximum A Posteriori) estimation using a Baum-Welch algorithm (S309 to S312), a state sequence is estimated from the obtained noise characteristics, and an impulsive noise at each time point is detected.
摘要翻译： 对于以预定间隔获得的电子电力线（通信介质）中的电压值（观察到的噪声序列），基于观察到的噪声序列本身的统计量的噪声特性的初始值由力矩法（S301〜S307 ），通过使用Baum-Welch算法的MAP（最大后验）估计，从初始值获得用于使观测到的噪声序列的似然性最大化的噪声特性（状态转移概率和状态噪声功率）（S309〜S312） 从获得的噪声特性估计状态序列，并且检测每个时间点的脉冲噪声。
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公开(公告)号：US4554672A
公开(公告)日：1985-11-19
申请号：US582215
申请日：1984-02-21
CPC分类号： H03B21/00 , H03C3/40 , H03C2200/0029
摘要： An improved oscillator which can adjust phase and frequency of the output signal independently from each other without time delay is disclosed. The oscillator is used for instance as a clock signal generator in a TDMA satellite communication system. The oscillator (FIG. 3) comprises a fixed oscillator (13) for providing a fixed frequency signal, a quadrature hybrid circuit (14) for providing a pair of quadrature phased signals from the output of said fixed oscillator (13), a control signal generator (17) for providing a pair of quadrature phased signals which satisfy b cos (2.pi..DELTA.f.sub.D t+.DELTA..phi..sub.D) and b sin (2.pi..DELTA.f.sub.D t+.DELTA..phi..sub.D), where b is a constant, .DELTA.f.sub.D is a desired frequency change, and .DELTA..phi..sub.D is a desired phase change, a pair of mixers (15,16) for providing products of each output of the quadrature hybrid circuit (14) and each output of the control signal generator (17), and an in-phase power combiner (20) for combining the outputs of the mixers (15,16 ) to provide a controlled output signal which satisfies ab sin [2.pi.(f.sub.O +.DELTA.f.sub.D)t+(.phi..sub.O +.DELTA..phi..sub.D)], where a, f.sub.O and .phi..sub.O are constants.
摘要翻译： 公开了一种改进的振荡器，其可以相互独立地调节输出信号的相位和频率而没有时间延迟。 振荡器例如用作TDMA卫星通信系统中的时钟信号发生器。 振荡器（图3）包括用于提供固定频率信号的固定振荡器（13），用于从所述固定振荡器（13）的输出提供一对正交相位信号的正交混合电路（14），控制信号 发生器（17），用于提供满足b cos（2πDELTA fDt + DELTA phi D）和bsin（2πDELTA fDt + DELTA phi D）的一对正交相位信号，其中b是常数，DELTA fD是期望频率 改变和DELTA phi D是期望的相位变化，一对用于提供正交混合电路（14）的每个输出和控制信号发生器（17）的每个输出的产物的混频器（15,16） 相位功率组合器（20），用于组合混频器（15,16）的输出，以提供满足absin [2π（f0 + DELTA fD）t +（phi + +ΔTATA）]的受控输出信号，其中a， fO和phi O是常数。
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公开(公告)号：US07058002B1
公开(公告)日：2006-06-06
申请号：US09787927
申请日：2000-04-21
IPC分类号： H04J11/00
CPC分类号： H04L27/2662 , H04L27/2657 , H04L27/266 , H04L27/2695
摘要： In an OFDM packet communication receiver, the deterioration of received signal quality is suppressed, even when carrier frequency error and/or clock frequency error exists between a transmitter and a receiver, and/or phase noise and/or thermal noise is superimposed to a received signal in a receiver.
摘要翻译： 在OFDM分组通信接收机中，即使发射机与接收机之间存在载波频率误差和/或时钟频率误差，也可以抑制接收信号质量的恶化，和/或将相位噪声和/或热噪声叠加到接收到的信号质量 信号在接收机。
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公开(公告)号：US06307837B1
公开(公告)日：2001-10-23
申请号：US09132148
申请日：1998-08-10
IPC分类号： H04L100
CPC分类号： H04L63/0236 , H04L1/0045 , H04L63/0428 , H04L63/08 , H04L63/1441 , H04L63/1466
摘要： A method of packet transfer is provided to resolve the problem of fraudulent access to user LANs through falsified source address so that only those pre-registered terminals are permitted to transfer packets with specific data networks. Each user LAN is assigned an identifier to identify respective user LAN beforehand. Packet network stores terminal information including terminal addresses, identifiers assigned to one and more user LANs that are permitted to communicate with each packet terminal and information necessary for terminal authentication beforehand. When the packet terminal starts a communication through a base station, the packet network authenticates the packet terminal, and if it is an unauthorized terminal, the packet network informs a denial for communication to the packet terminal. If an allowance for communication is obtained by authentication, the packet terminal encrypts data to be transmitted and sends a packet to the packet network with an attachment containing the encrypted data, identifiers for the selected user LAN among one and more user LANs, the destination address and the source address. Packet network receives the packet, and while decoding the encrypted data included in the received packet, detects tampering, and if tampering is detected, the received packet is discarded, but if there is no tampering, it checks whether the identity of source address and the identifier is registered in the terminal information, and if the identity is registered, the received packet is sent to the destination address, and if the identity is not registered, the received packet is discarded.
摘要翻译： 提供了一种分组传送方法，以通过伪造的源地址来解决对用户LAN的欺骗性访问的问题，使得只有那些预先注册的终端被允许传送具有特定数据网络的分组。 为每个用户LAN分配一个标识符，以便事先标识相应的用户LAN。 分组网络存储包括终端地址的终端信息，分配给允许与每个分组终端通信的一个和多个用户LAN的标识符以及终端认证所需的信息。 当分组终端通过基站开始通信时，分组网络对分组终端进行认证，如果是非授权终端，则分组网络通知拒绝与分组终端进行通信。 如果通过认证获得通信允许，则分组终端对要发送的数据进行加密，并将数据包发送到分组网络，其中包含加密数据的附件，一个或多个用户LAN中所选择的用户LAN的标识符，目的地址 和源地址。 分组网络接收分组，并且在解码包含在接收分组中的加密数据时，检测到篡改，并且如果检测到篡改，则丢弃所接收的分组，但是如果没有篡改，则它检查源地址的身份和 标识符被登记在终端信息中，并且如果身份被注册，则将接收到的分组发送到目的地地址，并且如果身份未被注册，则丢弃所接收的分组。
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公开(公告)号：US06658063B1
公开(公告)日：2003-12-02
申请号：US09617750
申请日：2000-07-17
IPC分类号： H04K110
CPC分类号： H04L27/2662 , H04L27/2657 , H04L27/2675
摘要： A preamble for synchronization, or a reference timing for operation of an OFDM packet communication receiver system is detected finely even under environment of large waveform distortion due to thermal noise and/or multi-path propagation, and/or large carrier frequency offset between a transmit side and a receiver side. A correlator (1) detects a pattern of a short preamble (t1-t10) in a preamble for synchronization. An output of the correlator (1) is applied to a complex filter (7) which separates a short preamble having a predetermined repetition period from uniformly distributed noise. A scalar filter (9) integrates some period of short preambles which have distributed-delay by multi-path propagation as if a single short preamble with no delay were received for determining a reference timing. When a correlator output exceeds a predetermined threshold level a plurality of times for every repetition periods (T) of a short preamble, and an output of the correlator after time (T) from the last short preamble is decreased a predetermined ratio as compared with that of the last short preamble, it is determined that a preamble for synchronization is detected. Carrier frequency offset compensation is carried out either for each short preamble during reception of a short preamble, or based upon the last received short preamble during reception of an OFDM symbol after the last short preamble. As a preamble for synchronization is detected accurately, a guard interval of each OFDM symbol is removed accurately, or an FFT window is defined accurately, so that a demodulation is possible in spite of noise and/or interference.
摘要翻译： 即使在由于热噪声和/或多径传播引起的大波形失真的环境中，也可以精细地检测用于同步的前同步码，或用于OFDM分组通信接收机系统的操作的参考定时和/或发送之间的大载波频率偏移 侧和接收器侧。 相关器（1）检测用于同步的前同步码中的短前导码（t1-t10）的模式。 相关器（1）的输出被应用于将具有预定重复周期的短前导码与均匀分布的噪声分离的复数滤波器（7）。 标量滤波器（9）通过多路径传播将具有分布延迟的一些短前导码的一段周期集成，如同接收到没有延迟的单个短前导码一样用于确定参考定时。 当相关器输出超过预定阈值电平时，对于短前导码的每个重复周期（T）和来自最后的前导码的时间（T）之后的相关器的输出的多次，与之相比减小了预定比率 在最后的短前导码中，确定检测到用于同步的前同步码。 在接收短前导码期间，或者基于在最后的短前导码之后的OFDM符号的接收期间的最后接收的短前导码，对于每个短前导码执行载波频率偏移补偿。 由于精确地检测到同步的前导码，所以准确地去除了每个OFDM符号的保护间隔，或者准确地定义了FFT窗口，使得即使有噪声和/或干扰，解调也是可能的。
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公开(公告)号：US06608863B1
公开(公告)日：2003-08-19
申请号：US09506076
申请日：2000-02-16
IPC分类号： H03H730
CPC分类号： H04L25/0236 , H04L5/0007 , H04L25/022 , H04L25/0232 , H04L27/2647
摘要： A coherent detection system for multicarrier modulation system capable of accurate channel estimation even in severe environment with high thermal noise and deep multipath fading, has been found with simple structure and small circuit size. The present coherent detection system comprises a channel estimation circuit (208) for estimating a channel attenuation of a preamble part of each subcarriers, an adaptive filter (210, 211) for smoothing estimated channel attenuation among subcarriers, a divider (213) for coherent detection of a data part by dividing a receive vector by smoothed estimated channel attenuation for each subcarriers, and a characteristic extraction circuit (209) for extracting characteristic value of each subcarriers. The adaptive filter (210, 211) is controlled depending upon characteristic value of each subcarriers measured by the characteristic extraction circuit (209). A characteristic value may be amplitude, phase rotation, vector difference, modulation system, of each subcarriers, and/or combination of those values.
摘要翻译： 已经发现，即使在具有高热噪声和深多径衰落的恶劣环境中也能够精确地进行信道估计的多载波调制系统的相干检测系统，结构简单，电路尺寸小。 本相干检测系统包括用于估计每个子载波的前导码部分的信道衰减的信道估计电路（208），用于平滑子载波之间的估计信道衰减的自适应滤波器（210,211），用于相干检测的分频器（213） 通过用接收矢量除以每个子载波的平滑估计的信道衰减来分配数据部分，以及用于提取每个子载波的特征值的特征提取电路（209）。 根据由特征提取电路（209）测量的每个子载波的特性值来控制自适应滤波器（210,211）。 特征值可以是每个子载波的振幅，相位旋转，矢量差，调制系统，和/或这些值的组合。
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10.发明授权Digital communication system using superposed transmission of high speed and low speed digital signals 失效数字通信系统采用叠加传输的高速和低速数字信号
公开(公告)号：US5280537A
公开(公告)日：1994-01-18
申请号：US980919
申请日：1992-11-24
IPC分类号： H04J13/00 , H04B1/707 , H04B7/216 , H04J99/00 , H04N7/20 , H04N21/2365 , H04N21/647 , H04L27/30 , H04L5/12 , H04J3/22
CPC分类号： H04B7/216
摘要： A digital communication system using superposed transmission of high and low speed digital signals capable of transmitting superposed high and low speed digital signals through an identical frequency band efficiently by increasing a simultaneously transmittable number of channels in the low speed digital signals, while achieving the practically reasonable bit error rate performances for both the high speed digital signals and the low speed digital signals. In this system, the low speed digital signals are transmitted in a form of spread spectrum signals and the high speed digital signals are cancelled out from the superposed transmission signals in obtaining the output low speed digital signals by using the phase inverted replica of the high speed digital signals to be combined with the superposed transmission signals, so that it becomes possible to increase a number of channels for the low speed digital signals, while achieving the practically reasonable bit error rate performances for both the high speed digital signals and the low speed digital signals.
摘要翻译： 一种使用高低速数字信号的叠加传输的数字通信系统，其能够通过在低速数字信号中增加同时可传送的信道数而有效地通过相同频带发送叠加的高速和低速数字信号，同时实现实际合理的 高速数字信号和低速数字信号的误码率性能。 在该系统中，以扩展频谱信号的形式传输低速数字信号，并且通过使用高速的相位反转副本从叠加的发送信号中抵消高速数字信号，从而获得输出的低速数字信号 数字信号与叠加的发送信号组合，使得可以增加用于低速数字信号的通道数，同时实现高速数字信号和低速数字信号的实际合理的比特误码率性能 信号。
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