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    Distortion estimation apparatus, frequency offset compensation apparatus and reception apparatus
    31.
    发明授权
    Distortion estimation apparatus, frequency offset compensation apparatus and reception apparatus 失效
    失真估计装置，频偏补偿装置和接收装置

    公开(公告)号：US06748026B1

    公开(公告)日：2004-06-08

    申请号：US09499303

    申请日：2000-02-07

    申请人： Yutaka Murakami ,  Shinichiro Takabayashi ,  Masayuki Orihashi ,  Akihiko Matsuoka

    发明人： Yutaka Murakami ,  Shinichiro Takabayashi ,  Masayuki Orihashi ,  Akihiko Matsuoka

    IPC分类号： H03K900

    CPC分类号： H04L27/3809 ,  H04L27/3872

    摘要： In-phase component approximation section 111 calculates an amplitude variation amount of an in-phase component of a data symbol from an amplitude variation amount of an in-phase component of a pilot symbol approximately. Quadrature component approximation section 112 calculates an amplitude variation amount of a quadrature component of the data symbol from an amplitude variation amount of a quadrature component of the pilot symbol approximately. Amplitude variation calculation section 113 calculates an amplitude variation amount of each data symbol from the amplitude variation amounts of the in-phase component and quadrature component of each data symbol. Phase variation calculation section 114 calculates a phase variation amount of the data symbol from a phase variation amount of the pilot symbol approximately. Thus, by calculating the amplitude variation amount of the data symbol and the phase variation amount of the data symbol separately, even in the case where a frequency offset between a transmitter and receiver is large, it is possible to estimate the frequency offset and fading distortion with high accuracy, and to suppress the deterioration of bit error rate characteristic.

    摘要翻译： 同相分量近似部分111从导频符号的同相分量的幅度变化量近似地计算数据符号的同相分量的振幅变化量。 正交分量近似部分112从导频符号的正交分量的幅度变化量近似地计算数据符号的正交分量的振幅变化量。 幅度变化计算部分113根据每个数据符号的同相分量和正交分量的振幅变化量来计算每个数据符号的振幅变化量。 相位变动计算部分114从导频符号的相位变化量近似地计算数据符号的相位变化量。 因此，通过分别计算数据符号的幅度变化量和数据符号的相位变化量，即使在发送器与接收器之间的频率偏移大的情况下，也可以估计频率偏移和衰落失真 高精度，并且抑制误码率特性的恶化。

    Wireless communication apparatus
    35.
    发明授权
    Wireless communication apparatus 有权
    无线通信装置

    公开(公告)号：US07676005B2

    公开(公告)日：2010-03-09

    申请号：US10598441

    申请日：2005-08-02

    申请人： Yasuaki Yuda ,  Takaaki Kishigami ,  Takashi Fukagawa ,  Yoichi Nakagawa ,  Shinichiro Takabayashi

    发明人： Yasuaki Yuda ,  Takaaki Kishigami ,  Takashi Fukagawa ,  Yoichi Nakagawa ,  Shinichiro Takabayashi

    IPC分类号： H03D1/04

    CPC分类号： H04B7/0619 ,  H04B7/0617 ,  H04B7/086 ,  H04B17/11 ,  H04B17/21

    摘要： In a wireless communication apparatus adopting a time division duplex system for executing transmission and reception using a plurality of antennas, deviation of amplitude and phase occurring between transmission and reception circuits is detected and corrected using a communication signal. Channel estimation means 105 detects channel information based on reception output of reception circuits 104-1 to 104-N provided in a one-to-one correspondence with a plurality of antennas 101-1 to 101-N. Correction value detection means 110 finds a correction value for correcting deviation occurring between each of transmission circuits 103-1 to 103-N and each of the reception circuits 104-1 to 104-N based on the channel information. A wireless communication apparatus 100 transmits an already known signal (training signal) to a base station with which the wireless communication apparatus conducts communications. The base station executes channel estimation based on the already known signal and generates and transmits a correction signal (probe signal). The correction value detection means 110 of the wireless communication apparatus 100 detects the correction value using the correction signal (probe signal).

    摘要翻译： 在采用使用多个天线执行发送和接收的时分双工系统的无线通信装置中，使用通信信号来检测和校正发送和接收电路之间发生的振幅和相位的偏差。 信道估计装置105基于与多个天线101-1至101-N一一对应地提供的接收电路104-1至104-N的接收输出来检测信道信息。 修正值检测单元110基于通道信息，求出用于校正发送电路103-1〜103-N和各接收电路104-1〜104-N的偏差的校正值。 无线通信装置100向无线通信装置进行通信的基站发送已知的信号（训练信号）。 基站根据已知的信号进行信道估计，生成并发送校正信号（探测信号）。 无线通信装置100的校正值检测装置110使用校正信号（探测信号）来检测校正值。

    Transmission apparatus, reception apparatus and digital radio communication method
    36.
    发明授权
    Transmission apparatus, reception apparatus and digital radio communication method 有权
    发送装置，接收装置和数字无线通信方式

    公开(公告)号：US07545882B2

    公开(公告)日：2009-06-09

    申请号：US11955443

    申请日：2007-12-13

    申请人： Yutaka Murakami ,  Shinichiro Takabayashi ,  Masayuki Orihashi ,  Akihiko Matsuoka

    发明人： Yutaka Murakami ,  Shinichiro Takabayashi ,  Masayuki Orihashi ,  Akihiko Matsuoka

    IPC分类号： H04L27/36 ,  H04L23/02

    CPC分类号： H04L27/12 ,  H04B1/38 ,  H04L1/0003 ,  H04L1/0006 ,  H04L27/206 ,  H04L27/34 ,  H04L27/3455

    摘要： A transmission apparatus includes a frame configuration determiner that determines a modulation scheme, from among a plurality of modulation schemes. A first symbol generator modulates a transmission signal according the modulation scheme determined by the frame configuration determiner to generate a first symbol, the first symbol being a first quadrature baseband signal. A second symbol generator modulates a pilot signal in accordance with a specific modulation scheme to generate a second symbol. A third symbol generator generates a third symbol to be inserted immediately before or immediately after the second symbol, the third symbol being different from the first symbol. On a signal space diagram, the third symbol generator arranges a signal point of the third symbol on a virtual line that links an origin with a signal point of the second symbol.

    摘要翻译： 传输装置包括从多个调制方案中确定调制方案的帧配置确定器。 第一符号发生器根据由帧配置确定器确定的调制方案来调制发送信号以产生第一符号，第一符号是第一正交基带信号。 第二符号发生器根据特定调制方案调制导频信号以产生第二符号。 第三符号生成器生成紧接在第二符号之前或之后插入的第三符号，第三符号不同于第一符号。 在信号空间图上，第三符号发生器将第三符号的信号点布置在将原点链接到第二符号的信号点的虚拟线上。

    TRANSMISSION APPARATUS, RECEPTION APPARATUS AND DIGITAL RADIO COMMUNICATION METHOD
    39.
    发明申请
    TRANSMISSION APPARATUS, RECEPTION APPARATUS AND DIGITAL RADIO COMMUNICATION METHOD 有权
    传输装置，接收装置和数字无线电通信方法

    公开(公告)号：US20080095270A1

    公开(公告)日：2008-04-24

    申请号：US11955443

    申请日：2007-12-13

    申请人： Yutaka MURAKAMI ,  Shinichiro TAKABAYASHI ,  Masayuki ORIHASHI ,  Akihiko MATSUOKA

    发明人： Yutaka MURAKAMI ,  Shinichiro TAKABAYASHI ,  Masayuki ORIHASHI ,  Akihiko MATSUOKA

    IPC分类号： H04L27/20 ,  H04L27/00

    CPC分类号： H04L27/12 ,  H04B1/38 ,  H04L1/0003 ,  H04L1/0006 ,  H04L27/206 ,  H04L27/34 ,  H04L27/3455

    摘要： A transmission apparatus includes a frame configuration determiner that determines a modulation system, from among a plurality of modulation systems, based on a communication situation. A first symbol generator modulates a digital transmission signal, according to the modulation system determined by the frame configuration determiner and generates a first symbol, the first symbol comprising a first quadrature baseband signal. A second symbol generator modulates a known digital transmission signal between a transmitting side and a receiving side and generates a second symbol, the second symbol comprising a second quadrature baseband signal.

    摘要翻译： 发送装置包括：帧配置确定器，其根据通信情况从多个调制系统中确定调制系统。 第一符号发生器根据由帧配置确定器确定的调制方式来调制数字传输信号，并产生第一符号，第一符号包括第一正交基带信号。 第二符号发生器在发送侧和接收侧之间调制已知的数字传输信号，并产生第二符号，第二符号包括第二正交基带信号。

    Nonlinear distortion compensation circuit with feedback and baseband reference signal that are phase and amplitude controllable
    40.
    发明授权
    Nonlinear distortion compensation circuit with feedback and baseband reference signal that are phase and amplitude controllable 有权
    具有相位和幅度可控的反馈和基带参考信号的非线性失真补偿电路

    公开(公告)号：US07289776B2

    公开(公告)日：2007-10-30

    申请号：US10518185

    申请日：2003-09-29

    申请人： Akihiko Matsuoka ,  Shinichiro Takabayashi ,  Yutaka Murakami

    发明人： Akihiko Matsuoka ,  Shinichiro Takabayashi ,  Yutaka Murakami

    IPC分类号： H01Q11/12

    CPC分类号： H03F1/3247 ,  H03F2201/3233 ,  H04L27/368

    摘要： A phase/amplitude control section controls the phase and amplitude of at least one of the signals: a distributed signal distributed by a modulation signal distributor and a reference signal based on an orthogonal base-band signal. A signal combiner combines a combinatory signal according to the distributed signal and the reference signal whose phase and amplitude have been controlled. A reference table updating section updates non-linear distortion compensating data according to the combinatory signal subjected to A/D conversion and the orthogonal base-band signal. With this configuration, since a known signal component is removed from the combinatory signal, the change amount of the signal input to the A/D converter of a feedback system circuit is reduced and the A/D converter of the feedback system circuit need not have a wide dynamic range performance.

    摘要翻译： 相位/幅度控制部分控制信号中的至少一个的相位和幅度：由调制信号分配器分配的分布式信号和基于正交基带信号的参考信号。 信号组合器根据分布信号和相位和振幅被控制的参考信号组合组合信号。 参考表更新部分根据经过A / D转换的组合信号和正交基带信号来更新非线性失真补偿数据。 利用这种配置，由于从组合信号中去除已知的信号分量，所以减少了输入到反馈系统电路的A / D转换器的信号的变化量，并且反馈系统电路的A / D转换器不需要 动态范围广泛的表现。