公开(公告)号：US4780887A

公开(公告)日：1988-10-25

申请号：US87319

申请日：1987-08-20

申请人： Susumu Otani ,  Yoshio Tanimoto ,  Shousei Yoshida

发明人： Susumu Otani ,  Yoshio Tanimoto ,  Shousei Yoshida

IPC分类号： H04L27/227 ,  H04L27/14

CPC分类号： H04L27/2277

摘要： A carrier recovery circuit comprises first and second mixers for mixing a received PSK signal with first and second reference frequency signals. A remodulator extracts a preamble from each burst of the PSK signal and supplies the extracted carrier to a carrier recovery means to cause it to derive a reference carrier from the extracted preamble. A phase detector is connected to the outputs of the first and second mixers for detecting a phase difference between the PSK signal and the reference carrier, the detected phase difference being applied to a resettable noise reduction circuit for reducing amplitude fluctuations contained in the phase difference, the noise reduction circuit being arranged to be reset in response to each of the bursts to discharge energy stored as a result of the noise reduction and eliminate interburst phase errors which occur as a result of interburst frequency variations. A variable phase shifter controls the phase of the reference carrier in accordance with the output of the noise eliminator and supplies quadrature versions of the phase controlled carrier to the first and second mixers as the first and second reference frequency signals.

公开(公告)号：US4835790A

公开(公告)日：1989-05-30

申请号：US210657

申请日：1988-06-23

申请人： Shousei Yoshida ,  Susumu Otani ,  Toshiya Todoroki

发明人： Shousei Yoshida ,  Susumu Otani ,  Toshiya Todoroki

IPC分类号： G01R29/26 ,  H04B17/00 ,  H04L27/00 ,  H04L27/227

CPC分类号： H04L27/2273 ,  G01R29/26 ,  H04B17/20 ,  H04L2027/0016 ,  H04L2027/0067 ,  H04L2027/0075

摘要： A carrier-to-noise detector comprises an A/D converter (1) which samples an output of the demodulator of a digital transmission system at a symbol clock rate and converting it to a digital signal having positive and negative values. An absolute value converting circuit (2) converts the output of A/D converter into an absolute value which is averaged by a first averaging circuit (3) over a period sufficient to suppress short term variations and then squared by a first squaring circuit (4) to give an output representing the carrier component. The output of A/D converter is, on the other hand, squared by a second squaring circuit (5) and averaged by a second averaging circuit (6) to suppress short term variations to give an output representing a total of the carrier and noise components. The carrier component in the output of the second averaging circuit 6 is subtracted by a subtractor (7). A ratio between the outputs of the first squaring circuit (4) and subtracting circuit (7) is derived by a divider (8) as a representation of a carrier-to-noise ratio.

摘要翻译： 载波噪声检测器包括A / D转换器（1），其以符号时钟速率对数字传输系统的解调器的输出进行采样，并将其转换为具有正值和负值的数字信号。 绝对值转换电路（2）将A / D转换器的输出转换为绝对值，该绝对值由第一平均电路（3）在足以抑制短期变化的时间内平均，然后由第一平方电路（4 ）来给出表示载波分量的输出。 另一方面，A / D转换器的输出由第二平方电路（5）平方并由第二平均电路（6）平均，以抑制短期变化，从而给出表示载波和噪声的总和的输出 组件。 第二平均电路6的输出中的载波分量由减法器（7）减去。 第一平方电路（4）和减法电路（7）的输出之间的比值由分频器（8）导出为载波噪声比的表示。

公开(公告)号：US4891598A

公开(公告)日：1990-01-02

申请号：US241669

申请日：1988-09-08

申请人： Shousei Yoshida ,  Susumu Otani

发明人： Shousei Yoshida ,  Susumu Otani

IPC分类号： H04L7/027 ,  H04L7/00 ,  H04L7/033 ,  H04L27/22

CPC分类号： H04L7/0334

摘要： In a variable bit rate clock recovery circuit, a phase difference between an input demodulated signal and a recovered clock signal is detected, the detected phase difference signal is filtered by a loop filter and is then integrated, the integrated signal is supplied as an address to first and second ROMs, which store data of cosine and sine waves in advance, output data from the first and second ROMs are respectively D/A-converted by first and second D/A converters, an output signal from a variable frequency generator is modulated by using an output from the first D/A converter, a signal obtained by shifting the output signal from the variable frequency signal generator by .pi./2 radians is modulated by an output from the second D/A converter, and the respective modulated signals are synthesized, thereby obtaining a reference clock signal.

公开(公告)号：US08351553B2

公开(公告)日：2013-01-08

申请号：US12297125

申请日：2007-02-02

申请人： Shousei Yoshida ,  Masayuki Kimata

发明人： Shousei Yoshida ,  Masayuki Kimata

IPC分类号： H04L1/02 ,  H04B7/04

CPC分类号： H04B7/0845 ,  H04B1/7107 ,  H04J15/00 ,  H04L5/023 ,  H04L2025/03414 ,  H04L2025/03426

摘要： In a MIMO receiving apparatus, the signals of single carriers transmitted from a plurality of transmission antennas are received by a plurality of reception antennas (1-1 through 1-N) and then separated according to frequency ranges. In this MIMO receiving apparatus, interference replicas of the antennas are eliminated from the received signals (by subtractor 54) before equalizing the two-dimensional frequency ranges, and non-distortion signal replicas are added (by a demodulating part 55) to the signals from which the interference replicas of the antennas have been eliminated after equalizing the two-dimensional frequency ranges.

摘要翻译： 在MIMO接收装置中，从多个发送天线发送的单载波的信号由多个接收天线（1-1〜1-N）接收，然后根据频率范围分离。 在该MIMO接收装置中，在均衡二维频率范围之前，从接收到的信号（由减法器54）中消除了天线的干扰副本，并且将非失真信号副本（由解调部分55）添加到来自 在平衡二维频率范围之后，已经消除了天线的干扰复制。

公开(公告)号：US08351523B2

公开(公告)日：2013-01-08

申请号：US12457839

申请日：2009-06-23

申请人： Yasunori Futatsugi ,  Shousei Yoshida

发明人： Yasunori Futatsugi ,  Shousei Yoshida

IPC分类号： H04K1/10

CPC分类号： H04L25/03159 ,  H04L1/0054 ,  H04L25/0224 ,  H04L25/03171 ,  H04L25/03828 ,  H04L25/497

摘要： A radio communication device for receiving a single-carrier signal transmitted in a partial spectrum of Nyquist frequency band, includes: an interference eliminator for eliminating interference from a received signal by spectrum reproduction of non-transmitted spectra using a symbol replica, to output an interference eliminated signal, wherein the interference includes intersymbol interference which is caused by symbols which are more than a predetermined distance away from a decision symbol point; a symbol sequence estimator for estimating a transmission symbol sequence by separating nearby intersymbol interference within the predetermined distance of the decision symbol point based on the interference eliminated signal, to output a decision signal; and a replica generator for generating the symbol replica from decoding result of the decision signal, wherein the symbol replica is fed back to the frequency-domain interference eliminator.

公开(公告)号：US08036295B2

公开(公告)日：2011-10-11

申请号：US11441199

申请日：2006-05-26

申请人： Shousei Yoshida

发明人： Shousei Yoshida

IPC分类号： H04B7/02 ,  H04B1/00 ,  H04L27/06

CPC分类号： H04B7/0848

摘要： A receiver uses a transmission channel matrix to obtain a superior signal separation characteristic regardless of differences in levels of multipath signals. A multipath linear combining unit performs linear combining of the multipaths in received signals of the reception antennas by means of the transmission channel matrix between the plurality of transmission antennas and the plurality of reception antennas. A maximum likelihood detector compares signals in which multipaths have been combined by the multipath linear combining unit with reception replicas that have been found using the transmission channel matrix to estimate the transmitted signals of each of the transmission antennas.

摘要翻译： 接收机使用传输信道矩阵来获得优越的信号分离特性，而与多径信号的电平差异无关。 多径线性组合单元借助于多个发送天线与多个接收天线之间的传输信道矩阵，对接收天线的接收信号中的多路径进行线性组合。 最大似然检测器将通过多径线性组合单元组合的多路径的信号与使用传输信道矩阵找到的接收副本进行比较，以估计每个发送天线的发送信号。

公开(公告)号：US07936838B2

公开(公告)日：2011-05-03

申请号：US10589460

申请日：2005-02-14

申请人： Takumi Ito ,  Shousei Yoshida ,  Yoshikazu Kakura ,  Hiroyuki Seki ,  Hiroyuki Kawai ,  Kenichi Higuchi ,  Mamoru Sawahashi

发明人： Takumi Ito ,  Shousei Yoshida ,  Yoshikazu Kakura ,  Hiroyuki Seki ,  Hiroyuki Kawai ,  Kenichi Higuchi ,  Mamoru Sawahashi

IPC分类号： H04B7/02

CPC分类号： H04L1/06 ,  H04B7/0854

摘要： It is an object to provide a receiving apparatus which is capable of demodulating signals with a very simple arrangement. Receiving apparatus 1 has N reception antennas 11-1-11-N, and reception antennas 11-1-11-N receive signals. Channel coefficient estimator 12 estimates and outputs channel coefficients from the signals received by respective reception antennas 11-1-11-N. QR decomposer 13 is supplied with a channel matrix having the channel coefficients as its elements, performs QR decomposition on the channel matrix, and outputs a Q matrix and an R matrix. A QH processor 14 is supplied with the Q matrix and the received signals, multiplies the received signals by a complex conjugate transposed matrix of the Q matrix, and outputs converted signal z. A transmitted sequence estimator 15 is supplied with converted signal z and the R matrix and estimates transmitted sequences.

摘要翻译： 本发明的目的是提供一种能够以非常简单的布置解调信号的接收装置。 接收装置1具有N个接收天线11-1-11-N，接收天线11-1-11-N接收信号。 信道系数估计器12从由各个接收天线11-1-11-N接收的信号估计和输出信道系数。 QR分解器13被提供有以通道系数作为其元件的通道矩阵，在通道矩阵上执行QR分解，并且输出Q矩阵和R矩阵。 Q Q处理器14被提供有Q矩阵和接收的信号，将接收的信号乘以Q矩阵的复共轭转置矩阵，并输出转换的信号z。 向发送序列估计器15提供转换的信号z和R矩阵并估计发送的序列。

公开(公告)号：US07830829B2

公开(公告)日：2010-11-09

申请号：US11641894

申请日：2006-12-20

申请人： Shousei Yoshida ,  Akihisa Ushirokawa

发明人： Shousei Yoshida ,  Akihisa Ushirokawa

IPC分类号： H04B7/185 ,  H04B7/216

CPC分类号： H04W52/42 ,  H04B1/707 ,  H04B1/7097 ,  H04B7/061 ,  H04B7/0615 ,  H04B7/0634 ,  H04B7/0671 ,  H04B7/0689 ,  H04B7/2628

摘要： An FDD/CDMA transmission/reception system includes a CDMA transmitter and a CDMA receiver. The CDMA transmitter includes a plurality of transmission antennas, signal transmission units for transmitting transmission signals weighted by different values to the respective transmission antennas, and pilot signal transmission units for transmitting a plurality of different pilot signals to the respective transmission antennas. The CDMA receiver includes a reception unit for obtaining one received signal from the transmission signals from the plurality of transmission antennas of the CDMA transmitter in consideration of reception quality, and a unit for transmitting antenna control signals corresponding to reception power values of the received pilot signals to the CDMA transmitter.

摘要翻译： FDD / CDMA发送/接收系统包括CDMA发射机和CDMA接收机。 CDMA发射机包括多个发射天线，用于将由不同值加权的传输信号发射到各个发射天线的信号传输单元，以及用于将多个不同导频信号发送到各个发射天线的导频信号传输单元。 考虑到接收质量，CDMA接收机包括用于从CDMA发射机的多个发送天线的发送信号中获得一个接收信号的接收单元，以及用于发送对应于接收到的导频信号的接收功率值的天线控制信号的单元 到CDMA发射机。

公开(公告)号：US07822132B2

公开(公告)日：2010-10-26

申请号：US11718510

申请日：2005-10-31

申请人： Hisashi Futaki ,  Yoshikazu Kakura ,  Shousei Yoshida ,  Takumi Ito

发明人： Hisashi Futaki ,  Yoshikazu Kakura ,  Shousei Yoshida ,  Takumi Ito

IPC分类号： H04K1/10

CPC分类号： H04L5/0094 ,  H04L5/0007 ,  H04L5/0046

摘要： N sub-carriers are grouped in units of predetermined quantities in order beginning with the one exhibiting the highest communication channel quality to generate an optimal group pattern on the reception side. Then, communication channel information is calculated for each of sub-carrier groups in the optimal group pattern or a quasi-optimal group pattern which is assumed to be closest to the optimal group pattern among a plurality of previously set group pattern candidates. Communication channel information is designated as modified communication channel information. Grouping information indicative of the optimal group pattern or quasi-optimal group pattern is combined with modified communication channel information to generate feedback information. On the transmission side, sub-carriers are grouped based on reproduced feedback information reproduced from the feedback information.

摘要翻译： N个子载波以预定量的单位被分组，从具有最高通信信道质量的一个开始，以在接收侧生成最佳组模式。 然后，针对多个先前设定的组模式候选中的最佳组模式中的每一个子载波组或被假设为最接近最佳组模式的准最优组模式计算通信信道信息。 通信信道信息被指定为修改的通信信道信息。 将表示最佳组模式或准最佳组模式的分组信息与修改的通信信道信息组合以产生反馈信息。 在发送侧，基于从反馈​​信息再现的再现的反馈信息对子载波进行分组。

公开(公告)号：US07565172B2

公开(公告)日：2009-07-21

申请号：US10560967

申请日：2004-06-23

申请人： Shousei Yoshida

发明人： Shousei Yoshida

IPC分类号： H04M1/00

CPC分类号： H04B7/0854 ,  H01Q3/2605

摘要： An adaptive antenna receiver whose follow-up performance is improved with respect to the angle change of the arrival direction of a desired signal. An antenna weight adaptive update section (11-1) adaptively updates the antenna weight according to a signals received by each antenna element and an error signal obtained from a desired signal corrected based on transmission channel estimation. An antenna weight direction constraint section (12-1) performs the constraint process for the antenna weight obtained by the antenna weight adaptive update section (11-1) to maintain the beam gain constant in the arrival direction of the desired signal. A beamformer (2-1) receives the desired signal through an array antenna using the antenna weight which has undergone the constraint process performed by the antenna weight direction constraint section (12-1). A transmission channel estimation section (3-1) estimates the transmission channel of the desired signal received by the beamformer (2-1) to correct the desired signal based on the estimation result.

摘要翻译： 一种自适应天线接收机，其相对于期望信号的到达方向的角度变化而改进后续性能。 天线权重自适应更新部分（11-1）根据由每个天线元件接收的信号和从基于传输信道估计校正的期望信号获得的误差信号自适应地更新天线权重。 天线权重方向约束部分（12-1）对由天线权重自适应更新部分（11-1）获得的天线权重进行约束处理，以使波束增益在期望信号的到达方向上保持恒定。 波束形成器（2-1）使用经过天线权重方向约束部分（12-1）进行的约束处理的天线权重，通过阵列天线接收期望的信号。 发送信道估计部（3-1）基于估计结果来估计由波束形成器（2-1）接收到的期望信号的传输信道，以校正所希望的信号。