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公开(公告)号：US5778032A
公开(公告)日：1998-07-07
申请号：US605984
申请日：1996-02-23
CPC分类号： H04L7/0062 , H03L7/091
摘要： A sampler (1) samples an inputted base band signal in accordance with a sampling clock, and holds a sample value (S.sub.n). Delay circuits (7, 8) hold sample values (S.sub.n-1, S.sub.n-2), respectively. A decision circuit (2) determines the sample value (S.sub.n-1), and outputs data (d.sub.n-1). A constant multiplier (16) multiplies the data (d.sub.n -1) by a constant (.alpha.). A subtracter (17) subtracts the data (d.sub.n-1) from the sample value (S.sub.n-1). Another subtracter (13) subtracts the sample value (S.sub.n) from the sample value (S.sub.n-2). A multiplier (14) multiplies the output of the subtracter (17) by that of the subtracter (13), and outputs a timing error signal. A low-pass filter (15) extracts a low frequency component of the timing error signal, and supplies a control voltage to a voltage controlled oscillator (6). The voltage controlled oscillator (6) outputs a sampling clock having a frequency which depends on the control voltage.
摘要翻译： 采样器（1）根据采样时钟对输入的基带信号进行采样，并保持采样值（Sn）。 延迟电路（7,8）分别保持采样值（Sn-1，Sn-2）。 判定电路（2）确定采样值（Sn-1），并输出数据（dn-1）。 常数乘法器（16）将数据（dn-1）乘以常数（α）。 减法器（17）从样本值（Sn-1）中减去数据（dn-1）。 另一个减法器（13）从样本值（Sn-2）中减去采样值（Sn）。 乘法器（14）将减法器（17）的输出乘以减法器（13）的输出，并输出定时误差信号。 低通滤波器（15）提取定时误差信号的低频分量，并向压控振荡器（6）提供控制电压。 压控振荡器（6）输出具有取决于控制电压的频率的采样时钟。
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公开(公告)号：US5745494A
公开(公告)日：1998-04-28
申请号：US859774
申请日：1997-05-21
IPC分类号： H04L12/42 , H04L12/18 , H04L12/433 , H04L12/403
CPC分类号： H04L12/1868 , H04L12/433 , H04L12/1854
摘要： A data frame which is transmitted from a transmitting station is provided with an individual response part (RS) having response bits (S1 to SN) corresponding to all stations on a network, so that the transmitting station initializes the individual response part (RS) in data transfer. Each receiving station outputs its own state to a prescribed position of the individual response part, and the transmitting station monitors the individual response part. Thus, it is possible to correctly confirm whether or not the data is normally transferred to those of the receiving stations which are to receive data.
摘要翻译： 从发送站发送的数据帧具有与网络上的所有站对应的响应位（S1〜SN）的单独响应部（RS），使得发送站将各个响应部（RS）初始化为 数据传输。 每个接收站将其自己的状态输出到个人响应部分的规定位置，并且发送站监视个体响应部分。 因此，可以正确地确认数据是否正常传送到要接收数据的接收站的数据。
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公开(公告)号：US5714972A
公开(公告)日：1998-02-03
申请号：US601653
申请日：1996-02-14
CPC分类号： G06F3/0354 , G06F1/1626 , G06F1/1694 , G06F3/0485 , G06F2200/1637
摘要： A position detector 1 detects the position of a display screen 4, an image memory 2 stores image information, a selector 3 selects a portion of the image information stored in the image memory 2 in accordance with the position of the display screen 4 detected by the position detector 1 and supplies the selected portion to the display screen 4, and the display screen 4 displays the selected image information. The invention is characterized in that when it is assumed that the entire image information stored in the image memory 2 is drawn in a viewing field space fixed relative to the eye, the selector 3 selects the image information to be drawn on the display screen 4 lying in the viewing field space.
摘要翻译： 位置检测器1检测显示屏幕4的位置，图像存储器2存储图像信息，选择器3根据由图像存储器2检测到的显示屏幕4的位置来选择存储在图像存储器2中的图像信息的一部分 位置检测器1，并将所选择的部分提供给显示屏幕4，并且显示屏幕4显示所选择的图像信息。 本发明的特征在于，当假设存储在图像存储器2中的整个图像信息被绘制在相对于眼睛固定的视野空间中时，选择器3选择在显示屏幕4上绘制的图像信息 在视野空间。
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公开(公告)号：US5774503A
公开(公告)日：1998-06-30
申请号：US697164
申请日：1996-08-20
申请人： Koichiro Tanaka , Tomonori Shiomi , Yasuo Nagaishi
发明人： Koichiro Tanaka , Tomonori Shiomi , Yasuo Nagaishi
CPC分类号： H04L27/2332 , H04L27/3872 , H04L2027/003 , H04L2027/0053
摘要： An oscillator 1 generates a local oscillation signal. A quadrature detector 2 converts an inputted carrier band signal into an equivalent low-frequency signal on the basis of the local oscillation signal. A complex multiplier 3 performs complex multiplication of the equivalent low-frequency signal and a complex coefficient to output a detection signal. An amplitude error detecting portion 4 detects a complex amplitude error of the detection signal. A coefficient error calculating portion 5 calculates a quantity proportional to an error of the complex coefficient from the complex amplitude error and the equivalent low-frequency signal and outputs it. A filter 6 converts the output of the coefficient error detecting portion into a complex coefficient and provides it to the complex multiplier 3. A data regenerating portion 7 converts the detection signal into demodulation data and outputs it.
摘要翻译： 振荡器1产生本地振荡信号。 正交检波器2基于本地振荡信号将输入的载波信号转换成等效的低频信号。 复数乘法器3执行等效低频信号和复系数的复数乘法以输出检测信号。 振幅误差检测部分4检测检测信号的复振幅误差。 系数误差计算部分5根据复振幅误差和等效低频信号计算与复系数的误差成比例的量并将其输出。 滤波器6将系数误差检测部分的输出转换为复数系数，并将其提供给复数乘法器3.数据再生部分7将检测信号转换成解调数据并将其输出。
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公开(公告)号：US07702027B2
公开(公告)日：2010-04-20
申请号：US10573044
申请日：2005-03-09
申请人： Naganori Shirakata , Yasuo Harada , Koichiro Tanaka , Tomohiro Kimura , Shuya Hosokawa , Yoshio Urabe
发明人： Naganori Shirakata , Yasuo Harada , Koichiro Tanaka , Tomohiro Kimura , Shuya Hosokawa , Yoshio Urabe
IPC分类号： H04B7/02
CPC分类号： H04L27/2657 , H04L25/0204 , H04L27/2613 , H04L27/2675
摘要： In a transfer apparatus to which MIMO-OFDM is applied, a data transmission method and a data reception method are provided in which, even when there are frequency errors varying among transfer paths, the precision of estimation of an inverse propagation coefficient function can be improved, thereby making it possible to suppress a degradation in characteristics. Among symbols composed of a plurality of subcarriers orthognal to each other, the transfer apparatus uses, as a synchronization symbol, a symbol in which predetermined amplitudes and phases are assigned to a plurality of subcarriers spaced at predetermined frequency intervals. The synchronization symbol is divided into transmission antennas to generate a plurality of synchronization subsymbols, which are in turn simultaneously transmitted from a plurality of transmission antennas. A reception apparatus estimates a frequency error for each transfer path based on synchronization subsymbols included in signals received by a plurality of reception antennas, and based on the estimated frequency errors, corrects the received signals.
摘要翻译： 在应用MIMO-OFDM的传送装置中，提供数据传输方法和数据接收方法，其中即使在传输路径之间存在频率误差变化的情况下，也可以提高反向传播系数函数的估计精度 ，从而可以抑制特性的劣化。 在由彼此正交的多个子载波组成的符号之中，传送装置使用将预定的幅度和相位分配给以预定频率间隔隔开的多个子载波的符号作为同步符号。 同步符号被分成发送天线以产生多个同步子符号，这些同步子符号又从多个发送天线同时发送。 接收装置基于由多个接收天线接收的信号中包含的同步子符号估计每个传送路径的频率误差，并且基于估计的频率误差来校正接收到的信号。
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公开(公告)号：US20070259623A1
公开(公告)日：2007-11-08
申请号：US11628039
申请日：2005-06-03
CPC分类号： H04B7/0854 , H04B17/345
摘要： A radio communication device that, even if it is interfered by a radio transmission station other than a radio transmission station with which it intends to communicate, estimates a signal transmitted from the intended radio transmission station by taking into account the influence of the interference, by obtaining an estimator of “s” that denotes a column vector representing a signal transmitted from the radio transmission station, in accordance with a following expression: s=RssHH(HRssHH+Ruu)−1r, where “Rss” denotes a covariance matrix of the column vector “s”, “r” denotes a column vector representing the signal received by the signal receiving unit, “H” denotes a matrix being the numerical sequence calculated by the first calculating unit, “Ruu” denotes a covariance matrix being the numerical sequence calculated by the second calculating unit, “H” denotes a complex conjugate transposition, and “−1” denotes an inverse matrix.
摘要翻译： 一种无线电通信装置，即使是由与其打算进行通信的无线电发送站以外的无线电发送站的干扰，也可以通过考虑干扰的影响来估计从预期的无线电发送站发送的信号，由 根据以下表达式获得表示表示从无线电发送站发送的信号的列向量的“s”的估计器：s = RssH H（H s H H H H + Ruu） -1，其中“Rss”表示列向量“s”的协方差矩阵，“r”表示表示由信号接收单元接收的信号的列向量“H” 表示由第一计算单元计算的数字序列的矩阵，“Ruu”表示由第二计算单元计算的数字序列的协方差矩阵，“H”表示复共轭转置，“ -1 “表示逆矩阵。
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7.发明申请公开(公告)号：US20060104195A1
公开(公告)日：2006-05-18
申请号：US11312344
申请日：2005-12-21
IPC分类号： H04J11/00
CPC分类号： H04L5/0048 , H04L5/0007 , H04L5/006 , H04L5/0085 , H04L25/022 , H04L25/0226 , H04L25/0232 , H04L27/2613 , H04L27/2657 , H04L27/2675
摘要： In an OFDM transmission scheme, in order to compensate any frequency response variation in time wise resulted from any distortion in a transmission path, out-of-synchronization with passage of time, frequency drift, and phase shift, and to improve a demodulation characteristic, a PS detector 261 in a receiver receiving an OFDM signal detects a pilot symbol. A PS1 TPFR calculator 62 calculates a frequency response of the transmission path for a first pilot symbol, while a PS2 TPFR calculator 63 calculates that for a second pilot symbol. Thereafter, a compensation vector calculator 64 calculates compensation vectors from the frequency responses of the transmission path for both of the first and second pilot symbols by linear approximation. A frequency response compensator 65 compensates the frequency response variation of subcarriers in a data symbol based on the calculated compensation vectors.
摘要翻译： 在OFDM传输方案中，为了补偿由于传输路径中的任何失真，与时间的流逝，频率漂移和相移失调的时间上的任何频率响应变化，并且为了改善解调特性， 在接收OFDM信号的接收机中的PS检测器261检测导频符号。 PS1 TPFR计算器62计算第一导频符号的传输路径的频率响应，而PS2 TPFR计算器63计算针对第二导频符号的频率响应。 此后，补偿矢量计算器64通过线性近似从第一和第二导频符号的传输路径的频率响应中计算补偿矢量。 频率响应补偿器65基于所计算的补偿向量来补偿数据符号中子载波的频率响应变化。
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公开(公告)号：US06993083B1
公开(公告)日：2006-01-31
申请号：US09597764
申请日：2000-06-20
申请人： Naganori Shirakata , Tomohiro Kimura , Koichiro Tanaka , Hideki Nakahara , Yasuo Harada , Shuya Hosokawa
发明人： Naganori Shirakata , Tomohiro Kimura , Koichiro Tanaka , Hideki Nakahara , Yasuo Harada , Shuya Hosokawa
IPC分类号： H04L7/04
CPC分类号： H04L27/2665 , H04L27/2662
摘要： An apparatus and method for OFDM demodulation establish symbol synchronization to minimize between-symbol interference even under an environment where multipath occurs.An incoming signal is an OFDM signal including a transmission symbol structured by a valid symbol period and a guard interval, and a predetermined synchronization symbol is included in the OFDM signal for every transmission frame. A correlator calculates how a signal generated by a synchronization symbol generator and the OFDM signal are correlated. A correlation calculator then calculates a correlation therefrom. An integrator integrates the calculated correlation by the guard interval. A timing determination device determines symbol timing from the integrated correlation. An FFT window generator outputs operation timing for Fourier transform from the determined symbol timing. Based on the signal outputted from the FFT window generator, the apparatus for OFDM demodulation extracts a signal in the valid symbol period from the transmission symbol for demodulation.
摘要翻译： 即使在发生多路径的环境下，用于OFDM解调的装置和方法建立符号同步以最小化符号间干扰。 输入信号是包括由有效符号周期和保护间隔构成的发送符号的OFDM信号，并且对于每个发送帧，在OFDM信号中包括预定的同步符号。 相关器计算由同步符号发生器和OFDM信号产生的信号的相关性。 然后，相关计算器从其计算相关性。 积分器将计算的相关性与保护间隔进行积分。 定时确定装置从综合相关确定符号定时。 FFT窗口生成器从所确定的符号定时输出用于傅里叶变换的操作定时。 基于从FFT窗口生成器输出的信号，OFDM解调装置从用于解调的发送符号中提取有效符号周期中的信号。
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9.发明授权公开(公告)号：US07843972B2
公开(公告)日：2010-11-30
申请号：US11312344
申请日：2005-12-21
CPC分类号： H04L5/0048 , H04L5/0007 , H04L5/006 , H04L5/0085 , H04L25/022 , H04L25/0226 , H04L25/0232 , H04L27/2613 , H04L27/2657 , H04L27/2675
摘要： In an OFDM transmission method, in order to compensate any frequency response variation time wise resulted from any distortion in a transmission path, out-of-synchronization with passage of time, frequency drift, and phase shift, and to improve a demodulation characteristic, a PS detector in a receiver receiving an OFDM signal detects a pilot symbol. A PS1 TPFR calculator calculates a frequency response of the transmission path for a first pilot symbol, while a PS2 TPFR calculator calculates a frequency response of the transmission path for a second pilot symbol. Thereafter, a compensation vector calculator calculates compensation vectors from the frequency responses of the transmission path for both the first and second pilot symbols by linear approximation. A frequency response compensator compensates the frequency response variation of subcarriers in a data symbol based on the calculated compensation vectors.
摘要翻译： 在OFDM传输方法中，为了补偿由于传输路径中的任何失真而导致的任何频率响应变化，与时间的流逝，频率漂移和相移失调，并且为了提高解调特性， 在接收OFDM信号的接收机中的PS检测器检测导频符号。 PS1 TPFR计算器计算第一导频符号的传输路径的频率响应，而PS2 TPFR计算器计算用于第二导频符号的传输路径的频率响应。 此后，补偿向量计算器通过线性近似来计算来自第一和第二导频符号的传输路径的频率响应的补偿向量。 频率响应补偿器基于所计算的补偿向量来补偿数据符号中子载波的频率响应变化。
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公开(公告)号：US20070121750A1
公开(公告)日：2007-05-31
申请号：US10573044
申请日：2005-03-09
申请人： Naganori Shirakata , Yasuo Harada , Koichiro Tanaka , Tomohiro Kimura , Shuya Hosokawa , Yoshio Urabe
发明人： Naganori Shirakata , Yasuo Harada , Koichiro Tanaka , Tomohiro Kimura , Shuya Hosokawa , Yoshio Urabe
IPC分类号： H04L1/02
CPC分类号： H04L27/2657 , H04L25/0204 , H04L27/2613 , H04L27/2675
摘要： In a transfer apparatus to which MIMO-OFDM is applied, a data transmission method and a data reception method are provided in which, even when there are frequency errors varying among transfer paths, the precision of estimation of an inverse propagation coefficient function can be improved, thereby making it possible to suppress a degradation in characteristics. Among symbols composed of a plurality of subcarriers orthognal to each other, the transfer apparatus uses, as a synchronization symbol, a symbol in which predetermined amplitudes and phases are assigned to a plurality of subcarriers spaced at predetermined frequency intervals. The synchronization symbol is divided into transmission antennas to generate a plurality of synchronization subsymbols, which are in turn simultaneously transmitted from a plurality of transmission antennas. A reception apparatus estimates a frequency error for each transfer path based on synchronization subsymbols included in signals received by a plurality of reception antennas, and based on the estimated frequency errors, corrects the received signals.
摘要翻译： 在应用MIMO-OFDM的传送装置中，提供数据传输方法和数据接收方法，其中即使在传输路径之间存在频率误差变化的情况下，也可以提高反向传播系数函数的估计精度 ，从而可以抑制特性的劣化。 在由彼此正交的多个子载波组成的符号之中，传送装置使用将预定的幅度和相位分配给以预定频率间隔隔开的多个子载波的符号作为同步符号。 同步符号被分成发送天线以产生多个同步子符号，这些同步子符号又从多个发送天线同时发送。 接收装置基于由多个接收天线接收的信号中包含的同步子符号估计每个传送路径的频率误差，并且基于估计的频率误差来校正接收到的信号。
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