公开(公告)号：US08897391B2

公开(公告)日：2014-11-25

申请号：US13612728

申请日：2012-09-12

Applicant: Daisuke Masunaga ,  Satoshi Matsubara ,  Takeshi Ohba ,  Hideharu Shako

Inventor： Daisuke Masunaga ,  Satoshi Matsubara ,  Takeshi Ohba ,  Hideharu Shako

IPC: H04K1/02 ,  H04B1/04

CPC classification number: H04B1/0475 ,  H03F1/3241 ,  H04B2001/0425

Abstract: A distortion compensator compensates for distortion of a signal caused by an amplifier. A storage section stores a plurality of compensation coefficients used for distortion compensation. A selection section selects a compensation coefficient corresponding to an index value indicative of a power level of the signal from among the plurality of compensation coefficients. The selection section determines whether or not the power level is higher than a threshold, and uses, based on a determination result, a first index value calculated without using a logarithmic operation or a second index value calculated by using a logarithmic operation.

Abstract translation: 失真补偿器补偿由放大器引起的信号失真。 存储部存储用于失真补偿的多个补偿系数。 选择部从多个补偿系数中选择与表示信号的功率电平的指标值对应的补偿系数。 选择部分确定功率电平是否高于阈值，并且基于确定结果使用不使用对数运算而计算的第一指标值或通过使用对数运算计算的第二指标值。

公开(公告)号：US08384477B2

公开(公告)日：2013-02-26

申请号：US12985552

申请日：2011-01-06

Applicant: Satoshi Matsubara ,  Shuya Hirata ,  Takeshi Ohba ,  Hideharu Shako ,  Jun Sugiyama

Inventor： Satoshi Matsubara ,  Shuya Hirata ,  Takeshi Ohba ,  Hideharu Shako ,  Jun Sugiyama

IPC: H03F1/26

CPC classification number: H03F1/3247

Abstract: A distortion compensating apparatus that compensates signal distortion caused by an amplifier includes a distortion compensating process unit that using a distortion compensation coefficient, compensates distortion of an input signal; a memory unit storing therein the distortion compensation coefficient; and an address generating unit that generates a first address that is based on electrical power of the input signal and is for acquiring the distortion compensation coefficient from the memory unit, and a second address that is based on any one among the electrical power, phase of the input signal and amplitude of the input signal, is for acquiring the distortion compensation coefficient from the memory unit, and is normalized in a normalizing range determined according to the electrical power of the input signal. The distortion compensating process unit acquires the distortion compensation coefficient from the memory unit, based on the first and the second addresses to compensate the distortion.

Abstract translation: 补偿由放大器引起的信号失真的失真补偿装置包括使用失真补偿系数补偿输入信号的失真的失真补偿处理单元; 存储单元，存储失真补偿系数; 以及地址生成单元，其生成基于所述输入信号的电力并且用于从所述存储单元获取所述失真补偿系数的第一地址，以及基于所述第一地址的电力 输入信号的输入信号和振幅用于从存储器单元获取失真补偿系数，并且在根据输入信号的电功率确定的归一化范围内被归一化。 失真补偿处理单元基于第一和第二地址从存储器单元获取失真补偿系数，以补偿失真。

公开(公告)号：US20120147991A1

公开(公告)日：2012-06-14

申请号：US13289210

申请日：2011-11-04

Applicant: Satoshi MATSUBARA ,  Takeshi OHBA ,  Hideharu SHAKO

Inventor： Satoshi MATSUBARA ,  Takeshi OHBA ,  Hideharu SHAKO

IPC: H04L25/49

CPC classification number: H04L25/03343 ,  H03F1/3241 ,  H03F3/19 ,  H03F2201/3233 ,  H04L27/368

Abstract: A distortion compensation device includes a storage unit storing a plurality of distortion compensation coefficients associated with power values of transmission signals, a distortion compensation processing unit acquiring a distortion compensation coefficient corresponding to a power value of a received transmission signal from among the plurality of distortion compensation coefficients and subjecting the received transmission signal to a distortion compensation process on the basis of the acquired distortion compensation coefficient, a phase calculating unit calculating a phase correction value on the basis of the distortion compensation coefficients, a phase correcting unit generating a reference signal by correcting a phase of the received transmission signal on the basis of the phase correction value, and a correction processing unit performing a correction process for the transmission signal subjected to the distortion compensation process on the basis of the reference signal and a feedback signal from a transmission power amplifier.

Abstract translation: 失真补偿装置包括：存储单元，存储与发送信号的功率值相关联的多个失真补偿系数;失真补偿处理单元，从多个失真补偿获取与所接收的发送信号的功率值对应的失真补偿系数; 系数，并且基于获取的失真补偿系数对所接收的发送信号进行失真补偿处理;相位计算单元，基于失真补偿系数来计算相位校正值;相位校正单元，通过校正产生参考信号 基于相位校正值的接收到的发送信号的相位，以及校正处理单元，其基于参考信号对经过失真补偿处理的发送信号进行校正处理，以及 来自发射功率放大器的反馈信号。

公开(公告)号：US20110227643A1

公开(公告)日：2011-09-22

申请号：US12985552

申请日：2011-01-06

Applicant: Satoshi Matsubara ,  Shuya Hirata ,  Takeshi Ohba ,  Hideharu Shako ,  Jun Sugiyama

Inventor： Satoshi Matsubara ,  Shuya Hirata ,  Takeshi Ohba ,  Hideharu Shako ,  Jun Sugiyama

IPC: H03F1/26

CPC classification number: H03F1/3247

Abstract: A distortion compensating apparatus that compensates signal distortion caused by an amplifier includes a distortion compensating process unit that using a distortion compensation coefficient, compensates distortion of an input signal; a memory unit storing therein the distortion compensation coefficient; and an address generating unit that generates a first address that is based on electrical power of the input signal and is for acquiring the distortion compensation coefficient from the memory unit, and a second address that is based on any one among the electrical power, phase of the input signal and amplitude of the input signal, is for acquiring the distortion compensation coefficient from the memory unit, and is normalized in a normalizing range determined according to the electrical power of the input signal. The distortion compensating process unit acquires the distortion compensation coefficient from the memory unit, based on the first and the second addresses to compensate the distortion.

Abstract translation: 补偿由放大器引起的信号失真的失真补偿装置包括使用失真补偿系数补偿输入信号的失真的失真补偿处理单元; 存储单元，存储失真补偿系数; 以及地址生成单元，其生成基于所述输入信号的电力并且用于从所述存储单元获取所述失真补偿系数的第一地址，以及基于所述第一地址的电力 输入信号的输入信号和振幅用于从存储器单元获取失真补偿系数，并且在根据输入信号的电功率确定的归一化范围内被归一化。 失真补偿处理单元基于第一和第二地址从存储器单元获取失真补偿系数，以补偿失真。

公开(公告)号：US20110221525A1

公开(公告)日：2011-09-15

申请号：US13029276

申请日：2011-02-17

Applicant: Satoshi Matsubara ,  Shuya Hirata ,  Takeshi Ohba ,  Hideharu Shako ,  Jun Sugiyama

Inventor： Satoshi Matsubara ,  Shuya Hirata ,  Takeshi Ohba ,  Hideharu Shako ,  Jun Sugiyama

IPC: H03F1/26

CPC classification number: H03F1/3247

Abstract: An error between the power of an input signal, which is input to a power amplifier, and the power of an output signal, which is output from the power amplifier, is calculated. The calculated error is normalized according to the power of the input signal or the power of the output signal. A distortion correction coefficient, which is stored in a predetermined storage unit in association with the power of the input signal, is updated using the normalized error.

Abstract translation: 计算输入到功率放大器的输入信号的功率与从功率放大器输出的输出信号的功率之间的误差。 计算误差根据输入信号的功率或输出信号的功率进行归一化。 使用归一化误差来更新存储在与输入信号的功率相关联的预定存储单元中的失真校正系数。

公开(公告)号：US07688914B2

公开(公告)日：2010-03-30

申请号：US11319046

申请日：2005-12-27

Applicant: Takeshi Ohba ,  Yasuhito Funyu ,  Hideharu Shako

Inventor： Takeshi Ohba ,  Yasuhito Funyu ,  Hideharu Shako

IPC: H04L25/49 ,  H03C1/06

CPC classification number: H04L27/368 ,  H03F1/3247 ,  H04L27/364 ,  H04L2027/0016

Abstract: A distortion compensating technique applied to a transmitter for transmitting a quadrature modulated signal in a wireless digital communication system is provided. A phase adjustment value is determined for a quadrature demodulated feedback signal based on comparison between the feedback signal and a reference signal to be transmitted from the transmitter. This phase adjustment value is compared with the previous phase adjustment value. If the comparison result between the current and previous phase adjustment values satisfies a prescribed condition, correction for quadrature modulation, such as DC offset correction, orthogonality correction, or IQ amplitude correction, is performed.

Abstract translation: 提供了一种应用于在无线数字通信系统中发送正交调制信号的发射机的失真补偿技术。 基于反馈信号和要从发射机发射的参考信号之间的比较，确定正交解调反馈信号的相位调整值。 该相位调整值与先前的相位调整值进行比较。 如果当前和前一相位调整值之间的比较结果满足规定条件，则执行诸如DC偏移校正，正交校正或IQ振幅校正之类的正交调制的校正。

公开(公告)号：US20100039158A1

公开(公告)日：2010-02-18

申请号：US12538321

申请日：2009-08-10

Applicant: Takeshi Ohba ,  Hideharu Shako

Inventor： Takeshi Ohba ,  Hideharu Shako

IPC: H03L5/00

CPC classification number: H04L27/0014 ,  H03F1/34 ,  H03F3/24 ,  H04B1/0475 ,  H04B2001/0433 ,  H04L2027/0016 ,  H04L2027/0018

Abstract: A direct-current-offset correction device includes a digital-to-analog converter that converts a digital signal into an analog signal, a modulator that modulates the analog signal to generate a modulated signal, a direct-current-offset correction value calculation unit that calculates a direct-current-offset correction value as a reverse characteristic component of a carrier leak occurring in the modulated signal based on a demodulated signal which is demodulated by feeding back the modulated signal, a direct-current-offset correction unit that corrects a direct-current-offset on the digital signal based on the direct-current-offset correction value, a correction value detection unit that detects whether or not the direct-current-offset correction value is zero or a neighboring value of zero, and an offset generation unit that superimposes a direct-current-offset component on the analog signal based on a detection result of the correction value detection unit.

Abstract translation: 直流偏移校正装置包括将数字信号转换为模拟信号的数模转换器，调制模拟信号以产生调制信号的调制器，直流偏移校正值计算单元， 基于通过反馈调制信号进行解调的解调信号，计算直流偏移校正值作为在调制信号中发生的载波泄漏的反向特性分量;直流偏移校正单元，其校正直接 基于直流偏移校正值对数字信号进行电流偏移;校正值检测单元，其检测直流偏移校正值是否为零，或相邻值为零;以及偏移生成 单元，其基于校正值检测单元的检测结果将直流偏移分量叠加在模拟信号上。

公开(公告)号：US07466762B2

公开(公告)日：2008-12-16

申请号：US11107851

申请日：2005-04-18

Applicant: Hideharu Shako ,  Yasuhito Funyu ,  Takeshi Ohba

Inventor： Hideharu Shako ,  Yasuhito Funyu ,  Takeshi Ohba

IPC: H04L25/49

CPC classification number: H04L27/368

Abstract: A distortion compensation apparatus shortens the time until start of the transmission. The distortion compensating apparatus for amplifying the transmitted signal after implementation of the distortion compensation process thereto comprises a coefficient memory operable to store coefficients used for the distortion compensation process, an initial value memory operable to store the initial values of the coefficients, and a controller which controls the coefficient memory to store, with limitation, only the coefficients corresponding to the first portion among those stored in the initial value memory for the initial write to the coefficient memory and to store thereafter the coefficients corresponding to the second portion.

Abstract translation: 失真补偿装置缩短直到开始发送的时间。 用于在实施失真补偿处理之后放大发送信号的失真补偿装置包括可操作以存储用于失真补偿处理的系数的系数存储器，可操作以存储系数的初始值的初始值存储器，以及控制器， 控制系数存储器，仅限于存储在初始值存储器中的那些对应于第一部分的系数用于对系数存储器的初始写入，并且此后存储对应于第二部分的系数。

公开(公告)号：US07433421B2

公开(公告)日：2008-10-07

申请号：US11147462

申请日：2005-06-08

Applicant: Hideharu Shako ,  Yasuhito Funyu ,  Takeshi Ohba

Inventor： Hideharu Shako ,  Yasuhito Funyu ,  Takeshi Ohba

IPC: H04L25/49

CPC classification number: H04L27/368 ,  H03F1/3247

Abstract: A distortion compensation apparatus is provided to restrain an increased calculation time caused by a large amount of calculation required for obtaining a phase variation amount for compensation from the correlation. The distortion compensation apparatus includes an update calculation section calculating a distortion compensation coefficient by use of an adaptive algorithm; a distortion compensation section performing distortion compensation to the transmission signal, based on the distortion compensation coefficient being read out from the distortion compensation coefficient storage; a correlation calculation section calculating a real part of correlation and an imaginary part of correlation of each the reference signal and the feedback signal; and a phase rotation section compensating a relative phase deviation between the reference signal and the feedback signal, based on the real part of correlation and the imaginary part of correlation calculated by the correlation calculation section, wherein the update calculation section calculates a distortion compensation coefficient using the post-compensation signal.

Abstract translation: 提供了一种失真补偿装置，用于抑制从相关性获得用于补偿的相位变化量所需的大量计算所引起的增加的计算时间。 失真补偿装置包括：更新计算部，利用自适应算法计算失真补偿系数; 基于从失真补偿系数存储器读出的失真补偿系数，对发送信号进行失真补偿的失真补偿部; 相关计算部分，计算每个参考信号和反馈信号的相关的实部和相关的虚部; 以及相位旋转部，其基于由所述相关计算部计算出的相关的实部和所述相关的虚部，补偿所述参考信号和所述反馈信号之间的相对相位偏差，其中，所述更新计算部使用 后补偿信号。

公开(公告)号：US07418057B2

公开(公告)日：2008-08-26

申请号：US11113043

申请日：2005-04-25

Applicant: Hideharu Shako ,  Yasuhito Funyu ,  Takeshi Ohba

Inventor： Hideharu Shako ,  Yasuhito Funyu ,  Takeshi Ohba

IPC: H04L25/49

CPC classification number: H03F1/3247

Abstract: To shorten the time required for writing of the distortion compensation coefficient and to reduce amount of data of the distortion compensation coefficient stored as the initial value of the distortion compensation apparatus. The distortion compensation apparatus for amplifying the transmitting signal after implementing the distortion compensation process comprises a coefficient memory for storing corresponding to each address the coefficient used for the distortion compensation process, an initial value memory for storing the initial value of the coefficient, and a controller for write control corresponding to n (n: natural number equal to 2 or larger) addresses of the coefficient read from the initial value memory corresponding to one address.

Abstract translation: 缩短写入失真补偿系数所需的时间并减少作为失真补偿装置的初始值存储的失真补偿系数的数据量。 用于在实施失真补偿处理之后放大发送信号的失真补偿装置包括用于存储对应于每个地址的用于失真补偿处理的系数的系数存储器，用于存储系数的初始值的初始值存储器，以及控制器 对应于从对应于一个地址的初始值存储器读取的系数的n（n：等于2或更大的自然数）的地址的写入控制。