专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

41. 发明授权

US5586148A Coherent detection system 失效
标题翻译：相干检测系统
公开(公告)号：US5586148A
公开(公告)日：1996-12-17
申请号：US455127
申请日：1995-05-31
申请人： Hideto Furukawa , Kazuo Kawabata
发明人： Hideto Furukawa , Kazuo Kawabata
IPC分类号： H04L27/38 , H03D1/22 , H04L1/06 , H04L27/22 , H04L27/227 , H03D1/00 , H04L27/06
CPC分类号： H03D1/22 , H04L1/06 , H04L27/2275
摘要： A coherent detection system synchronously detects a received wave involving a Doppler shift. To realize a stable demodulation performance, the system has a memory for storing in advance Doppler shifts to be related to an input signal and corresponding pass bands to reduce the bit error rate of restored information to below an allowable maximum when the corresponding Doppler shifts are present; an estimating unit for finding levels of the input signal or instantaneous values R of the input signal that form an envelope, counting the number N per unit time of points where the envelope crosses a threshold, and estimating a Doppler shift fD according to an expression that indicates the ratio of the number N to the Doppler shift fD and involves the in-phase and orthogonal components of the input signal, a distribution of the temporal differentiation of these components, a distribution of power spectra, and the instantaneous values normalized by the threshold; and a band controller for retrieving a pass band corresponding to the estimated Doppler shift fD from the memory and setting the pass band to a filter of the system.
摘要翻译：相干检测系统同步地检测涉及多普勒频移的接收波。为了实现稳定的解调性能，系统具有存储器，用于预先存储与输入信号和对应的通带相关的多普勒频移，以便当存在相应的多普勒频移时将恢复的信息的误码率降低到可允许的最大值以下 ; 用于发现输入信号的电平或形成包络的输入信号的瞬时值R的估计单元，对包络线跨越阈值的每单位时间点的数量N进行计数，并根据以下表达式来估计多普勒频移fD：表示数量N与多普勒频移fD的比率，并且涉及输入信号的同相和正交分量，这些分量的时间微分的分布，功率谱的分布和由阈值归一化的瞬时值 ; 以及频带控制器，用于从存储器检索对应于估计的多普勒频移fD的通带，并将通带设置为系统的滤波器。

42. 发明授权

US5515401A Network control system for controlling relative errors between network nodes 失效
标题翻译：网络控制系统，用于控制网络节点之间的相对误差
公开(公告)号：US5515401A
公开(公告)日：1996-05-07
申请号：US463920
申请日：1995-06-05
申请人： Tetsuyoshi Takenaka , Hideto Furukawa , Nobutsugu Fujino , Satoru Chikuma , Atsushi Yamashita , Takeshi Inoue
发明人： Tetsuyoshi Takenaka , Hideto Furukawa , Nobutsugu Fujino , Satoru Chikuma , Atsushi Yamashita , Takeshi Inoue
IPC分类号： H04J3/06 , H04L1/00 , H04B7/00
CPC分类号： H04W56/0035 , H04J3/0638 , H04L1/00
摘要： A network control system for controlling a plurality of nodes respectively corresponding to, and provided in, a plurality of radio zones. Each node has a corresponding base station. A mobil station travels among the plurality of radio zones and communicates with the base station of a respective node when travelling in a radio zone corresponding to the respective node. Each base station transmits a transmission signal to adjacent nodes and receives transmission signals transmitted from the base stations of adjacent nodes. Each base station includes (a) a reception automatic frequency control unit receiving the transmission signals transmitted by base stations of adjacent nodes, and performing an automatic frequency control operation for each received transmission signal, (b) a frequency error detection unit detecting a frequency error between the automatic frequency controlled transmission signals and a frequency obtained by adding a nominal frequency gap between base stations to the transmission frequency of the transmission signal of the node corresponding to the frequency error detection unit, (c) an averaging unit spatially filtering the frequency errors to produce a spatial mean value, and (d) a transmission frequency control unit controlling the transmission frequency of the node corresponding to the transmission frequency control unit in accordance with the spatial mean value, to substantially eliminate the frequency errors.
摘要翻译：一种网络控制系统，用于分别对应于并提供在多个无线电区域中的多个节点进行控制。每个节点都有相应的基站。移动站在多个无线电区域中行进，并且在与相应节点对应的无线电区域中行进时，与相应节点的基站进行通信。每个基站向相邻节点发送传输信号，并接收从相邻节点的基站发送的传输信号。每个基站包括：（a）接收自动频率控制单元，接收相邻节点的基站发送的发送信号，并对每个所接收的发送信号执行自动频率控制操作;（b）频率误差检测单元，检测频率误差在自动频率控制传输信号之间和通过将基站之间的标称频率间隔相加到与频率误差检测单元相对应的节点的传输信号的传输频率而获得的频率，（c）空间滤波频率误差以产生空间平均值，以及（d）发送频率控制单元，根据空间平均值来控制对应于发送频率控制单元的节点的发送频率，以基本上消除频率误差。

43. 发明授权

US08107521B2 Equalizer device 有权
标题翻译：均衡器装置
公开(公告)号：US08107521B2
公开(公告)日：2012-01-31
申请号：US12027386
申请日：2008-02-07
申请人： Daisuke Ogawa , Takashi Dateki , Hideto Furukawa
发明人： Daisuke Ogawa , Takashi Dateki , Hideto Furukawa
IPC分类号： H03H7/30
CPC分类号： H04B1/707 , H04B1/7093 , H04L25/03006
摘要： An equalizer device which enables tap coefficient correction accuracy to be improved to enable high-quality adaptive equalization. A tap coefficient filter corrects tap coefficients thereof in accordance with a control signal and equalizes a received signal in which a data signal is multiplexed with a pilot signal, which is a known signal for compensating for variation in reception of the data signal. A training signal setter sets both of the data signal and the pilot signal as a training signal, which indicates an ideal value of equalized output. A tap coefficient corrector obtains an error signal indicative of a differential value between the training signal and a filter output signal which is output from the tap coefficient filter after being equalized, performs an adaptive algorithm operation so as to decrease the error signal, and generates the control signal for correcting the tap coefficients.
摘要翻译：能够提高使能抽头系数校正精度以实现高品质自适应均衡的均衡器装置。抽头系数滤波器根据控制信号校正其抽头系数，并且将数据信号被复用的接收信号与作为用于补偿数据信号的接收变化的已知信号的导频信号相加。训练信号设定器将数据信号和导频信号均设为训练信号，表示均衡输出的理想值。抽头系数校正器获得表示训练信号和均衡后从抽头系数滤波器输出的滤波器输出信号之间的差分值的误差信号，执行自适应算法操作以减少误差信号，并产生用于校正抽头系数的控制信号。

44. 发明授权

US08064328B2 Channel estimation device 有权
标题翻译：信道估计装置
公开(公告)号：US08064328B2
公开(公告)日：2011-11-22
申请号：US11896990
申请日：2007-09-07
申请人： Daisuke Ogawa , Takashi Dateki , Hideto Furukawa
发明人： Daisuke Ogawa , Takashi Dateki , Hideto Furukawa
IPC分类号： H04J11/00
CPC分类号： H04L25/0228 , H04L27/2647
摘要： A channel estimation device in wireless communication in use of a plurality of subcarriers for communication, comprises: a first channel estimation section which performs channel estimation for each subcarrier based on pilot signals mapped to each subcarrier; a second channel estimation section which further estimates channels for each subcarrier using channel estimation values estimated by the first channel estimation section; and a channel selection section, which selects and outputs the first and second channel estimation values estimated by the first and second channel estimation sections, according to the subcarrier.
摘要翻译：一种使用多个子载波进行无线通信的信道估计装置，包括：第一信道估计部，其基于映射到每个子载波的导频信号对每个子载波进行信道估计; 第二信道估计部，其使用由所述第一信道估计部估计的信道估计值进一步估计每个子载波的信道; 以及频道选择部，其根据副载波选择并输出由第一和第二信道估计部估计出的第一和第二信道估计值。

45. 发明授权

US07995536B2 Multi-input multi-output (MIMO) for wireless transmitting and receiving stations 有权
标题翻译：用于无线发射和接收站的多输入多输出（MIMO）
公开(公告)号：US07995536B2
公开(公告)日：2011-08-09
申请号：US11783017
申请日：2007-04-05
申请人： Daisuke Ogawa , Takashi Dateki , Hideto Furukawa
发明人： Daisuke Ogawa , Takashi Dateki , Hideto Furukawa
IPC分类号： H04W4/00 , H04B7/212
CPC分类号： H04B7/022 , H04B7/0413 , H04B7/0691
摘要： A wireless terminal receives a signal from a first BTS as a communication party and a signal from a second BTS when receiving the signal from the first BTS by using a communication slot that is assigned to the terminal, the terminal comprises receiving antennas; a demodulator unit that estimates channels of received signals, and demodulates the received signals by using the estimation result; and a discriminating unit discriminating the number of transmitting antennas to be used in the first BTS in the communication slot which is assigned to the terminal, in which in the case where the number of channels that are produced between the first BTS and the terminal, which is determined according to the number of transmitting antennas, is smaller than the number of channels that can be estimated by the demodulator unit, the demodulator unit estimates the channel between the terminal and the first BTS by using a signal from the first BTS, and estimates the channel between the terminal and the second BTS by using a signal from the second BTS.
摘要翻译：无线终端通过使用分配给终端的通信时隙从第一BTS接收来自第一BTS的信号和来自第二BTS的信号，该终端包括接收天线; 解调器单元，其估计接收信号的信道，并通过使用估计结果解调接收的信号; 以及鉴别单元，鉴别在分配给终端的通信时隙中在第一BTS中要使用的发送天线的数量，其中在第一BTS和终端之间产生的信道的数量，根据发送天线的数量确定，小于可由解调器单元估计的信道的数量，解调器单元通过使用来自第一BTS的信号估计终端与第一BTS之间的信道，并且估计通过使用来自第二BTS的信号在终端和第二BTS之间的信道。

46. 发明申请

US20080130733A1 EQUALIZER DEVICE 有权
标题翻译：均衡器设备
公开(公告)号：US20080130733A1
公开(公告)日：2008-06-05
申请号：US12027386
申请日：2008-02-07
申请人： Daisuke Ogawa , Takashi Dateki , Hideto Furukawa
发明人： Daisuke Ogawa , Takashi Dateki , Hideto Furukawa
IPC分类号： H03K5/159
CPC分类号： H04B1/707 , H04B1/7093 , H04L25/03006
摘要： An equalizer device which enables tap coefficient correction accuracy to be improved to enable high-quality adaptive equalization. A tap coefficient filter corrects tap coefficients thereof in accordance with a control signal and equalizes a received signal in which a data signal is multiplexed with a pilot signal, which is a known signal for compensating for variation in reception of the data signal. A training signal setter sets both of the data signal and the pilot signal as a training signal, which indicates an ideal value of equalized output. A tap coefficient corrector obtains an error signal indicative of a differential value between the training signal and a filter output signal which is output from the tap coefficient filter after being equalized, performs an adaptive algorithm operation so as to decrease the error signal, and generates the control signal for correcting the tap coefficients.
摘要翻译：能够提高使能抽头系数校正精度以实现高品质自适应均衡的均衡器装置。抽头系数滤波器根据控制信号校正其抽头系数，并且将数据信号被复用的接收信号与作为用于补偿数据信号的接收变化的已知信号的导频信号相加。训练信号设定器将数据信号和导频信号均设为训练信号，表示均衡输出的理想值。抽头系数校正器获得表示训练信号和均衡后从抽头系数滤波器输出的滤波器输出信号之间的差分值的误差信号，执行自适应算法操作以减少误差信号，并产生用于校正抽头系数的控制信号。

47. 发明申请

US20080112386A1 Channel estimation device 有权
标题翻译：信道估计装置
公开(公告)号：US20080112386A1
公开(公告)日：2008-05-15
申请号：US11896990
申请日：2007-09-07
申请人： Daisuke Ogawa , Takashi Dateki , Hideto Furukawa
发明人： Daisuke Ogawa , Takashi Dateki , Hideto Furukawa
IPC分类号： H04J3/00
CPC分类号： H04L25/0228 , H04L27/2647
摘要： A channel estimation device in wireless communication in use of a plurality of subcarriers for communication, comprises: a first channel estimation section which performs channel estimation for each subcarrier based on pilot signals mapped to each subcarrier; a second channel estimation section which further estimates channels for each subcarrier using channel estimation values estimated by the first channel estimation section; and a channel selection section, which selects and outputs the first and second channel estimation values estimated by the first and second channel estimation sections, according to the subcarrier.
摘要翻译：一种使用多个子载波进行无线通信的信道估计装置，包括：第一信道估计部，其基于映射到每个子载波的导频信号对每个子载波进行信道估计; 第二信道估计部，其使用由所述第一信道估计部估计的信道估计值进一步估计每个子载波的信道; 以及频道选择部，其根据副载波选择并输出由第一和第二信道估计部估计出的第一和第二信道估计值。

48. 发明授权

US07310305B2 Method for determining reference phase in radio communication system which uses orthogonal M-ary modulation, and coherent detection method using the same 失效
标题翻译：用于使用正交M进制调制的无线电通信系统中的参考相位的确定方法以及使用其的相干检测方法
公开(公告)号：US07310305B2
公开(公告)日：2007-12-18
申请号：US10143747
申请日：2002-05-10
申请人： Hideto Furukawa , Makoto Yoshida , Nami Hatazoe
发明人： Hideto Furukawa , Makoto Yoshida , Nami Hatazoe
IPC分类号： H04J11/00
CPC分类号： H04B1/707 , H04B2001/70935 , H04L27/20 , H04L27/3818 , H04L27/3845
摘要： Reference phase is a radio communication system using orthogonal M-ary modulation is determined, so that a coherent detection system for a CDMA radio communication system is readily achieved. The determination of reference phase is performed by the step of determining a reference phase in a radio communication system, which uses orthogonal M-ary codes comprising the steps of determining the correlation values of an in-phase component and quadrature component corresponding to respective Hadamard matrices resulting from fast Hadamard transform or inverse Hadamard transform of a signal, which possesses said in-phase component and quadrature component, and which is sent from the sending end by phase shift keying an orthogonal M-ary code computing the sum of the squares of the respective correlation values of said in-phase component and quadrature component and selecting either said fast Hadamard transform or inverse Hadamard transform output, which outputs a maximum value of said computed sum of the squares.
摘要翻译：参考相位是确定使用正交M进制调制的无线电通信系统，从而容易地实现用于CDMA无线电通信系统的相干检测系统。参考相位的确定通过确定无线电通信系统中的参考相位的步骤来执行，该无线电通信系统使用正交的M元码，包括以下步骤：确定与相应的哈达玛矩阵相对应的同相分量和正交分量的相关值由具有所述同相分量和正交分量的信号的快速Hadamard变换或反Hadamard变换产生，并且通过相移键控从发送端发送正交M代码，计算正交M代码的平方和所述同相分量和正交分量的相应相关值，并选择所述快速哈达玛变换或反哈达玛变换输出，其输出所计算的平方和的最大值。

49. 发明授权

US07305022B2 RAKE receiver having MIXR function 有权
标题翻译： RAKE接收机具有MIXR功能
公开(公告)号：US07305022B2
公开(公告)日：2007-12-04
申请号：US10789226
申请日：2004-02-26
申请人： Daisuke Ogawa , Hideto Furukawa , Takashi Dateki , Masahiko Shimizu , Tsuyoshi Hasegawa
发明人： Daisuke Ogawa , Hideto Furukawa , Takashi Dateki , Masahiko Shimizu , Tsuyoshi Hasegawa
IPC分类号： H04B1/00
CPC分类号： H04B1/712 , H04B1/7117
摘要： MIXR is implemented with a realistic amount of hardware even when the number of detected paths is large. From among path timings detected by a path searcher and MICTs generated based on the detected path timings, as many timings as there are fingers are selected by a timing selector and the selected timings are assigned to the fingers. When selecting the timings, the value of SNIR expected to be achieved by RAKE combining in a RAKE combiner, for example, is predicted by calculation from a received signal, and the path timing and MICT that maximize the SNIR are selected.
摘要翻译：即使检测到的路径数量大，MIXR也可以实现硬实际的硬件。由路径搜索器检测到的路径定时和基于检测到的路径定时生成的MICT之间，定时选择器选择与手指一样多的定时，并将所选择的定时分配给手指。当选择定时时，例如通过从接收信号的计算来预测通过RAKE组合器中的RAKE组合预期的SNIR的值被预测，并且选择使SNIR最大化的路径定时和MICT。

50. 发明申请

US20070254693A1 Radio communication system 失效
标题翻译：无线通信系统
公开(公告)号：US20070254693A1
公开(公告)日：2007-11-01
申请号：US11819410
申请日：2007-06-27
申请人： Hideto Furukawa
发明人： Hideto Furukawa
IPC分类号： H04B1/02 , H04B7/08 , H04M1/00
CPC分类号： H04B1/005 , H04B7/2621 , H04L27/2602
摘要： In a radio communication system in which multiple bands or a plurality of different radio frequencies are used, a different radio transmission method is used in each band or at each radio frequency. For example, by transmitting data using radio formats which are different in each band or at each radio frequency, the radio transmission method is made different in each band or at each radio frequency. In order to vary the radio format, (1) the pilot length is varied at each radio frequency; or (2) the pilot interval is varied at each radio frequency; or (3) the guard interval length is varied in each band or at each radio frequency; or (4) when multicarrier modulation is used for radio communication in each band, the subcarrier interval for multicarrier transmission is varied in each band.
摘要翻译：在使用多个频带或多个不同射频的无线电通信系统中，在每个频带或每个射频使用不同的无线电传输方法。例如，通过使用在每个频带或每个射频不同的无线电格式发送数据，使得无线电传输方法在每个频带或每个射频处不同。为了改变无线电格式，（1）导频长度在每个射频频率下变化; 或（2）导频间隔在每个射频处变化; 或（3）每个频带或每个射频改变保护间隔长度; 或（4）当多载波调制用于每个频带中的无线电通信时，多载波传输的子载波间隔在每个频带中变化。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式