公开(公告)号：US06487193B1

公开(公告)日：2002-11-26

申请号：US09378265

申请日：1999-08-20

申请人： Hajime Hamada ,  Yasuyuki Oishi ,  Kazuo Nagatani ,  Michiharu Nakamura ,  Koji Matsuyama

发明人： Hajime Hamada ,  Yasuyuki Oishi ,  Kazuo Nagatani ,  Michiharu Nakamura ,  Koji Matsuyama

IPC分类号： H04B7216

CPC分类号： H04B7/18584

摘要： The present invention is directed to a path searching device and a CDMA receiver employing the same, having a reduced circuit scale and operating to carry out a smaller number of operations. For a direct spreading CDMA communication system, a CDMA receiver includes a reception demodulator including an antenna, a high-frequency amplifier a band-pass filter, demodulators, etc. The CDMA receiver also has despreading units, a determination unit, and a path search device. The path search device has a sampling unit for sampling an input signal by low-speed oversampling based on an integer multiple of a chip rate and by high-speed oversampling that is faster than the low-speed oversampling, a first circuit for finding a correlative value between a spreading code and a signal provided by the low-speed oversampling and finding timing corresponding to a maximum correlative value. A second circuit for finding despreading timing according to correlative values between a signal provided by the high-speed oversampling and a spreading code corresponding to the timing provided by the first circuit.

摘要翻译： 本发明涉及一种路径搜索装置和采用该路径搜索装置的CDMA接收机，其具有减小的电路规模并且操作以执行较少数量的操作。 对于直接扩频CDMA通信系统，CDMA接收机包括接收解调器，包括天线，高频放大器，带通滤波器，解调器等。CDMA接收机还具有解扩单元，确定单元和路径搜索 设备。 路径搜索装置具有采样单元，用于通过基于芯片速率的整数倍的低速过采样和通过比低速过采样快的高速过采样来对输入信号进行采样，用于找到相关的第一电路 扩展码与由对应于最大相关值的低速过采样和寻找定时提供的信号之间的值。 根据由高速过采样提供的信号与对应于由第一电路提供的定时的扩展码之间的相关值，找到解扩定时的第二电路。

公开(公告)号：US06442218B1

公开(公告)日：2002-08-27

申请号：US09377141

申请日：1999-08-19

申请人： Michiharu Nakamura ,  Yasuyuki Oishi ,  Kazuo Nagatani ,  Hajime Hamada ,  Yoshihiko Asano ,  Hiroyuki Seki ,  Yoshinori Tanaka

发明人： Michiharu Nakamura ,  Yasuyuki Oishi ,  Kazuo Nagatani ,  Hajime Hamada ,  Yoshihiko Asano ,  Hiroyuki Seki ,  Yoshinori Tanaka

IPC分类号： H03D100

CPC分类号： H04L25/062 ,  H04L25/03114

摘要： The present invention relates to a demodulator which receives a signal transmitted via phase modulation or multivalue QAM modulation, and decides transmitted data based on the received signal. The present invention enhances a transmission-line estimate by using tentatively decided data symbols as pilot symbols and in estimating a transmission line without a decrease in accuracy of transmission-line estimate even when an error rate of the tentatively decided data symbols is increased. The demodulator includes a pilot-based transmission-line estimation unit for estimating transmission-line characteristics by using pilot symbols. A tentative-data-decision unit for tentatively deciding data symbols based on the pilot-based transmission-line estimate. A data-based transmission-line estimation unit for estimating the transmission-line characteristics by using the tentatively decided data. Weight-coefficient-multiplication units for multiplying pilot-based and data-based transmission-line estimates by respective weights having a ratio therebetween varying in accordance with reliability of the tentatively ascertained data. A pilot&data-based transmission-line estimation unit for obtaining a transmission-line estimate by averaging weighted transmission-line estimates.

摘要翻译： 本发明涉及一种接收通过相位调制或多值QAM调制发送的信号的解调器，并且基于接收到的信号来确定发送的数据。 本发明通过使用暂时确定的数据符号作为导频符号，并且即使当临时确定的数据符号的错误率增加时，也不会降低传输线估计的精度，来增强传输线估计。 解调器包括基于导频的传输线估计单元，用于通过使用导频符号估计传输线特性。 一种暂定数据判定单元，用于基于基于导频的传输线估计暂时地确定数据符号。 一种基于数据的传输线估计单元，用于通过使用暂时确定的数据来估计传输线特性。 权重系数乘法单元，用于乘以基于导频和基于数据的传输线估计，其各自的权重之间的比率根据暂时确定的数据的可靠性而变化。 一种基于导频和数据的传输线估计单元，用于通过对加权的传输线估计进行平均来获得传输线估计。

公开(公告)号：US07519097B2

公开(公告)日：2009-04-14

申请号：US10279394

申请日：2002-10-24

申请人： Yasuyuki Oishi ,  Tokuro Kubo ,  Kazuo Nagatani

发明人： Yasuyuki Oishi ,  Tokuro Kubo ,  Kazuo Nagatani

IPC分类号： H04B7/216

CPC分类号： H04L5/06

摘要： The invention relates to a spread-signal multiplexing circuit for frequency-multiplexing a plurality of spread signals that were generated in parallel according to the SSMA scheme. An object of the invention is to adapt to various degrees of multiplicity and to keep the SN ratio and the power efficiency high. To this end, a spread-signal multiplexing circuit of the invention comprises an amplitude monitoring part for multiplexing a plurality of spread signals and determining amplitude of a resulting signal in time-series order; a delaying part for delaying the spread signals in parallel by a time that is equal to a propagation delay time of the amplitude monitoring part; and a multiplexing part for generating a multiplexed signal by multiplexing the delayed spread signals while weighting the delayed spread signals in parallel using weights that are smaller as an average value of the determined amplitude is larger.

摘要翻译： 本发明涉及一种用于对根据SSMA方案并行生成的多个扩展信号进行频率复用的扩展信号复用电路。 本发明的一个目的是适应不同程度的多重性，并保持SN比和功率效率。 为此，本发明的扩展信号复用电路包括用于多路复用多个扩展信号并且以时间顺序确定所得信号的幅度的幅度监视部分; 延迟部分，用于将扩展信号并行延迟等于振幅监测部分的传播延迟时间的时间; 以及复用部分，用于通过多路复用延迟的扩展信号来产生多路复用信号，同时使用作为所确定的幅度的平均值较小的权重来并行加权延迟的扩展信号。

公开(公告)号：US06836517B2

公开(公告)日：2004-12-28

申请号：US09745948

申请日：2000-12-22

申请人： Kazuo Nagatani ,  Tokuro Kubo ,  Takayoshi Ode ,  Yasuyuki Oishi

发明人： Kazuo Nagatani ,  Tokuro Kubo ,  Takayoshi Ode ,  Yasuyuki Oishi

IPC分类号： H04K102

CPC分类号： H04L27/368 ,  H03F1/3247 ,  H03F1/3288

摘要： A distortion compensating apparatus for compensating for a distortion of a transmission power amplifier. A delay time decision unit calculates the correlation between a transmission signal and a feedback signal fed back from the output side of the transmission power amplifier while varying phase difference between both signals, and decides the total delay time caused in the transmission power amplifier and a feedback loop on the basis of the phase difference in which the correlation is the maximum. A delay unit delays the transmission signal before a distortion compensation processing by the total delay time, and inputs the delayed signal into a distortion compensating apparatus arithmetic unit, which calculates and stores a distortion compensation coefficient on the basis of the transmission signal and the feedback signal fed back from the output side of the transmission power amplifier. A pre-distortion unit applies a distortion compensation processing to the transmission signal by using the distortion compensation coefficient.

摘要翻译： 一种用于补偿发射功率放大器的失真的失真补偿装置。 延迟时间决定单元计算发送信号与从发送功率放大器的输出侧反馈的反馈信号之间的相关性，同时改变两个信号之间的相位差，并且确定在发送功率放大器中引起的总延迟时间和反馈 基于相关性最大的相位差进行循环。 延迟单元将失真补偿处理之前的发送信号延迟总延迟时间，并将延迟信号输入失真补偿装置运算单元，该运算单元基于发送信号和反馈信号计算并存储失真补偿系数 从发射功率放大器的输出侧反馈。 预失真单元通过使用失真补偿系数对发送信号应用失真补偿处理。

公开(公告)号：US06737918B2

公开(公告)日：2004-05-18

申请号：US10629134

申请日：2003-07-29

申请人： Yasuyuki Oishi ,  Tokuro Kubo ,  Kazuo Nagatani ,  Toru Maniwa

发明人： Yasuyuki Oishi ,  Tokuro Kubo ,  Kazuo Nagatani ,  Toru Maniwa

IPC分类号： H03F126

CPC分类号： H03F1/3247 ,  H03F1/3282 ,  H03F1/3294 ,  H03F1/34 ,  H03F3/24 ,  H04B2001/0433 ,  H04L27/368

摘要： An input complex base band signal x(t) is complex-multiplied by a distortion compensation coefficient h(p), quadrature-modulated by a quadrature modulator QMOD, and input into a power amplifier AMP. A part of the output from the power amplifier AMP is input into a band pass filter BPF, the band pass filter BPF extracts an adjacent channel leakage power band, and a power detector detects an adjacent channel leakage power value. A distortion compensation coefficient arithmetic unit GA using a genetic algorithm computes a distortion compensation coefficient based on an adjacent channel leakage power value on an adjacent channel leakage power ratio and an input complex base band signal x(t), and outputs a distortion compensation coefficient h(p) as a function of a power value p of the input complex base band signal.

摘要翻译： 输入复基带信号x（t）被正交调制器QMOD正交调制的失真补偿系数h（p）复乘，并输入到功率放大器AMP。 来自功率放大器AMP的输出的一部分被输入到带通滤波器BPF中，带通滤波器BPF提取相邻信道泄漏功率带，并且功率检测器检测相邻信道泄漏功率值。 使用遗传算法的失真补偿系数算术单元GA根据相邻信道泄漏功率比的相邻信道泄漏功率值和输入复基带信号x（t）计算失真补偿系数，并输出失真补偿系数h （p）作为输入复基带信号的功率值p的函数。

公开(公告)号：US5870668A

公开(公告)日：1999-02-09

申请号：US688443

申请日：1996-07-30

申请人： Takeshi Takano ,  Yasuyuki Oishi ,  Eisuke Fukuda ,  Hideto Furukawa ,  Kazuo Nagatani

发明人： Takeshi Takano ,  Yasuyuki Oishi ,  Eisuke Fukuda ,  Hideto Furukawa ,  Kazuo Nagatani

IPC分类号： H03D7/16 ,  H03F1/32 ,  H04B7/0005

CPC分类号： H03D7/168 ,  H03F1/3241 ,  H03F2200/372

摘要： A amplifier having distortion compensation is employed as a power amplifier for amplifying a linear modulated signal or a low noise amplifier for amplifying a linear modulated signal. The amplifier having distortion compenssation includes an amplifier circuit for amplifying an input signal; an error detecting circuit for obtaining an error signal between the input signal to and an output signal from the amplifier circuit; a coefficient generating circuit for generating compensation coefficients to compensate distortion components of characteristics of the amplifier circuit, based on the error signal according to an adaptive type algorithm; a first outputting circuit for outputting a generated compensation coefficient corresponding to the input signal; and a multiplying circuit for multiplying the generated compensation coefficient to the input signal and inputting a multiplied coefficient to the amplifier circuit.

摘要翻译： 使用具有失真补偿的放大器作为用于放大线性调制信号的功率放大器或用于放大线性调制信号的低噪声放大器。 具有失真补偿的放大器包括用于放大输入信号的放大器电路; 用于获得来自放大器电路的输入信号与输出信号之间的误差信号的误差检测电路; 系数产生电路，用于根据自适应型算法产生补偿系数以补偿放大器电路的特性的失真分量; 第一输出电路，用于输出与输入信号对应的产生的补偿系数; 以及乘法电路，用于将所生成的补偿系数与输入信号相乘，并将乘法系数输入到放大器电路。

公开(公告)号：US07020447B2

公开(公告)日：2006-03-28

申请号：US10010263

申请日：2001-12-06

申请人： Kazuo Nagatani ,  Yasuyuki Oishi ,  Tokuro Kubo ,  Takayoshi Ode ,  Takeshi Takano ,  Toru Maniwa

发明人： Kazuo Nagatani ,  Yasuyuki Oishi ,  Tokuro Kubo ,  Takayoshi Ode ,  Takeshi Takano ,  Toru Maniwa

IPC分类号： H04B1/04

CPC分类号： H03G5/165 ,  H03F1/3247 ,  H03F1/3258 ,  H03F1/3294 ,  H03F2201/3224 ,  H03F2201/3233

摘要： Distortion compensation coefficients for correcting distortion of a transmission power amplifier are stored in a memory beforehand, a distortion compensation coefficient conforming to powers or amplitudes of a present transmit signal and a past transmit signal is read out of the memory, and distortion compensation processing is applied to the transmit signal using this distortion compensation coefficient. The transmit signal thus subjected to distortion compensation processing is then amplified by the transmission power amplifier and the amplified signal is transmitted, and the distortion compensation coefficient is updated based upon the transmit signal before distortion compensation and an output signal from the transmission power amplifier.

公开(公告)号：US06567478B2

公开(公告)日：2003-05-20

申请号：US10037809

申请日：2001-11-07

申请人： Yasuyuki Oishi ,  Takeshi Takano ,  Kazuo Nagatani ,  Tokuro Kubo ,  Takayoshi Ode

发明人： Yasuyuki Oishi ,  Takeshi Takano ,  Kazuo Nagatani ,  Tokuro Kubo ,  Takayoshi Ode

IPC分类号： H04L2549

CPC分类号： H04J1/00 ,  H03F1/3247 ,  H03F1/34 ,  H03F3/24 ,  H04B2001/0433 ,  H04L27/367 ,  H04W52/52

摘要： In a radio apparatus which compensates for non-linear distortion of a transmission power amplifier, a distributor feeds back the output signal of the transmission power amplifier, an error-signal estimating arithmetic unit digitally estimates an error signal, which is ascribable to non-linear distortion of the power amplifier, using a transmit signal and feedback signal, the transmit signal and the error signal are DA-converted by separate DA converters, and a combiner combines the output signals of the DA converters and inputs the combined signal to the transmission power amplifier to perform distortion compensation.

公开(公告)号：US08588711B2

公开(公告)日：2013-11-19

申请号：US13234665

申请日：2011-09-16

申请人： Hiroyoshi Ishikawa ,  Nobukazu Fudaba ,  Kazuo Nagatani ,  Yasuyuki Oishi

发明人： Hiroyoshi Ishikawa ,  Nobukazu Fudaba ,  Kazuo Nagatani ,  Yasuyuki Oishi

IPC分类号： H04B1/04 ,  H03F1/32

CPC分类号： H03F1/3247 ,  H03F1/3258 ,  H03F3/189 ,  H03F3/24 ,  H03F2200/336 ,  H03F2200/451 ,  H03F2201/3233 ,  H03M1/0614 ,  H03M1/66 ,  H04B1/0475

摘要： A transmission apparatus includes an analog digital converter that performs sampling on a demodulated signal obtained by demodulating a part of an output signal, which is produced by amplifying a modulated signal of a baseband signal including a plurality of signals having frequencies separated from each other, at a sampling frequency lower than a frequency of a given intermodulation distortion component and converting the demodulated signal into a digital signal, a detection section that detects an aliasing component of the given intermodulation distortion component produced by the conversion of the analog digital converter, and a distortion compensation section that compensates an input signal to be modulated for the given intermodulation distortion component in accordance with the detected aliasing component.

摘要翻译： 一种发送装置，包括：模拟数字转换器，对通过解调部分输出信号而获得的解调信号进行采样，所述解调信号是通过放大包括具有彼此分离的频率的多个信号的基带信号的调制信号而产生的， 采样频率低于给定互调失真分量的频率并将解调信号转换为数字信号;检测部分，其检测通过模拟数字转换器的转换产生的给定互调失真分量的混叠分量;以及失真 补偿部分，根据检测到的混叠分量来补偿对于给定的互调失真分量要调制的输入信号。

公开(公告)号：US20120068768A1

公开(公告)日：2012-03-22

申请号：US13234665

申请日：2011-09-16

申请人： Hiroyoshi Ishikawa ,  Nobukazu Fudaba ,  Kazuo Nagatani ,  Yasuyuki Oishi

发明人： Hiroyoshi Ishikawa ,  Nobukazu Fudaba ,  Kazuo Nagatani ,  Yasuyuki Oishi

IPC分类号： H03F1/26 ,  H03M1/12

CPC分类号： H03F1/3247 ,  H03F1/3258 ,  H03F3/189 ,  H03F3/24 ,  H03F2200/336 ,  H03F2200/451 ,  H03F2201/3233 ,  H03M1/0614 ,  H03M1/66 ,  H04B1/0475

摘要： A transmission apparatus includes an analog digital converter that performs sampling on a demodulated signal obtained by demodulating a part of an output signal, which is produced by amplifying a modulated signal of a baseband signal including a plurality of signals having frequencies separated from each other, at a sampling frequency lower than a frequency of a given intermodulation distortion component and converting the demodulated signal into a digital signal, a detection section that detects an aliasing component of the given intermodulation distortion component produced by the conversion of the analog digital converter, and a distortion compensation section that compensates an input signal to be modulated for the given intermodulation distortion component in accordance with the detected aliasing component.

摘要翻译： 一种发送装置，包括：模拟数字转换器，对通过解调部分输出信号而获得的解调信号进行采样，所述解调信号是通过放大包括具有彼此分离的频率的多个信号的基带信号的调制信号而产生的， 采样频率低于给定互调失真分量的频率并将解调信号转换为数字信号;检测部分，其检测通过模拟数字转换器的转换产生的给定互调失真分量的混叠分量;以及失真 补偿部分，根据检测到的混叠分量来补偿对于给定的互调失真分量要调制的输入信号。