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1. 发明授权

US09768891B2 Distortion compensation device and distortion compensation method 有权
公开(公告)号：US09768891B2
公开(公告)日：2017-09-19
申请号：US15351894
申请日：2016-11-15
申请人： FUJITSU LIMITED
发明人： Hiroyoshi Ishikawa , Tomoya Ota , Kazuo Nagatani
IPC分类号： H04B1/62 , H04B15/00 , H04W52/52
CPC分类号： H04B15/00 , H04B1/0475 , H04B17/11 , H04B17/12 , H04B17/13 , H04B2001/0425 , H04W52/52
摘要： A distortion compensation device includes a multiplier, a subtracter, an LUT, and a distortion compensation unit. The multiplier calculates the product of amplitudes or the product of power of transmission signals at two different times or calculates the ratio of amplitudes or the ratio of power of transmission signals at two different times. The subtracter calculates the phase difference between the transmission signals at two different times. The LUT specifies a distortion compensation coefficient by using both the product or the ratio calculated by the multiplier and the phase difference calculated by the subtracter. The distortion compensation unit performs, by using the distortion compensation coefficient specified by the LUT, a predistortion process on the transmission signal that is input to the amplifier.

2. 发明授权

US09548703B2 Distortion compensation apparatus, transmission apparatus, and distortion compensation method 有权
标题翻译：失真补偿装置，传输装置和失真补偿方法
公开(公告)号：US09548703B2
公开(公告)日：2017-01-17
申请号：US14484074
申请日：2014-09-11
申请人： FUJITSU LIMITED
发明人： Satoshi Matsubara , Hiroyoshi Ishikawa
IPC分类号： H03F1/26 , H04K1/02 , H03F1/32 , H03F3/24
CPC分类号： H03F1/3247 , H03F1/3258 , H03F3/24 , H03F2201/3227 , H03F2201/3233
摘要： A distortion compensation apparatus including: a memory configured to store a plurality of distortion compensation coefficients for compensating distortion to an input signal amplified by an amplifier, each of the plurality of distortion compensation coefficients being associated with a different combination of two addresses, and a processor configured to receive temperature information associated with a temperature of the amplifier, generate a first address based on the input signal at a first time, generate a second address based on an average of the input signal during a previous period preceding the first time, the average being calculated based on the temperature information, select a distortion compensation coefficient from the plurality of distortion compensation coefficients based on the first address and the second address, and compensate distortion to the input signal based on the selected distortion compensation coefficient.
摘要翻译：一种失真补偿装置，包括：存储器，被配置为存储用于将失真补偿到由放大器放大的输入信号的多个失真补偿系数，所述多个失真补偿系数中的每一个与两个地址的不同组合相关联，并且处理器被配置为接收与所述放大器的温度相关联的温度信息，在第一时间基于所述输入信号生成第一地址，基于在所述第一时间之前的前一时段期间的所述输入信号的平均值生成第二地址，基于所述温度信息计算，基于所述第一地址和所述第二地址从所述多个失真补偿系数中选择失真补偿系数，并且基于所选择的失真补偿系数来补偿所述输入信号的失真。

3. 发明申请

US20170111064A1 DISTORTION COMPENSATION DEVICE 审中-公开
公开(公告)号：US20170111064A1
公开(公告)日：2017-04-20
申请号：US15268081
申请日：2016-09-16
申请人： FUJITSU LIMITED
发明人： Tomoya Ota , Hiroyoshi Ishikawa , Kazuo Nagatani
IPC分类号： H04B1/04
CPC分类号： H04B1/0475 , H04B1/0466 , H04B2001/0425
摘要： A distortion compensation device includes an address generating unit, a look up table (LUT), and a multiplier. The address generating unit calculates pieces of difference information for different combinations each including transmission signals at different timings. Each of the pieces of difference information is the difference in amplitude or power between the transmission signals in a corresponding one of the combinations. The LUT specifies a distortion compensation coefficient by using the above pieces of difference information calculated by the address generating unit. The multiplier performs predistortion, using a distortion compensation coefficient specified by the LUT, on a transmission signal to be input to an amplifier.

4. 发明授权

US09515861B2 Peak suppression apparatus 有权
标题翻译：峰值抑制装置
公开(公告)号：US09515861B2
公开(公告)日：2016-12-06
申请号：US14697897
申请日：2015-04-28
申请人： FUJITSU LIMITED
发明人： Tomoya Ota , Hiroyoshi Ishikawa , Kazuo Nagatani
IPC分类号： H04K1/02 , H04L25/03 , H04L25/49 , H04L27/26
CPC分类号： H04L27/2624
摘要： A peak suppression apparatus includes an acquiring unit that acquires a first signal represented by an amplitude waveform of a multicarrier signal, a generator that generates a second signal represented by a waveform sequentially connecting a plurality of peak points adjacent to one another in the first signal as a peak detection signal for the multicarrier signal, a detector that detects a peak value and a peak timing of the multicarrier signal by using the peak detection signal, and a suppressing unit that suppresses a peak of the multicarrier signal based on the peak value and the peak timing.
摘要翻译：峰值抑制装置包括获取单元，其获取由多载波信号的振幅波形表示的第一信号，生成器，其生成由在第一信号中将彼此相邻的多个峰值顺序连接的波形表示的第二信号，用于多载波信号的峰值检测信号，通过使用峰值检测信号来检测多载波信号的峰值和峰值定时的检测器，以及基于峰值抑制多载波信号的峰值的抑制单元，峰值时间

5. 发明授权

US09276799B2 Wireless transmission apparatus and distortion compensation method 有权
标题翻译：无线传输装置和失真补偿方法
公开(公告)号：US09276799B2
公开(公告)日：2016-03-01
申请号：US14672945
申请日：2015-03-30
申请人： FUJITSU LIMITED
发明人： Yuichi Utsunomiya , Hiroyoshi Ishikawa , Kazuo Nagatani
IPC分类号： H04L27/36 , H03F1/32 , H03F3/21
CPC分类号： H04L27/368 , H03F1/3247 , H03F3/21 , H03F3/245 , H03F2201/3215 , H04L27/2627 , H04L27/2657
摘要： A wireless transmission apparatus includes an amplifier that amplifies power of a multicarrier signal, a first frequency shift unit that performs a first frequency shift on a first signal fed back from the amplifier on the basis of carrier frequencies of the multicarrier signal to output a second signal after the first frequency shift, a band limiting unit that performs frequency band limitation on the second signal to output a third signal after the frequency band limitation, and a distortion compensation device that compensates nonlinear distortion of the amplifier on the basis of the third signal.
摘要翻译：无线发送装置包括：放大器，用于放大多载波信号的功率;第一频移单元，其基于多载波信号的载波频率对从放大器反馈的第一信号执行第一频移，以输出第二信号在第一频移之后的频带限制单元，对频域限制后的第二信号进行频带限制，输出第三信号;以及失真补偿装置，其根据第三信号补偿放大器的非线性失真。

6. 发明授权

US09270231B2 Distortion compensation apparatus, wireless transmission apparatus, and distortion compensation method 有权
标题翻译：失真补偿装置，无线传输装置和失真补偿方法
公开(公告)号：US09270231B2
公开(公告)日：2016-02-23
申请号：US14595283
申请日：2015-01-13
申请人： FUJITSU LIMITED
发明人： Yuichi Utsunomiya , Hiroyoshi Ishikawa , Kazuo Nagatani
IPC分类号： H04B1/04 , H03F1/32
CPC分类号： H03F1/3247 , H03F1/3241 , H03F1/3294 , H03F1/34 , H03F3/24 , H03F2200/129 , H03F2200/336 , H03F2201/3215 , H04B1/04 , H04B1/0475 , H04B2001/0425 , H04B2001/0433
摘要： A distortion compensation apparatus that compensates nonlinear distortion of an amplifier that amplifies power of a multi-carrier signal includes a band limiting unit that places a first frequency band limitation on a first signal fed back from the amplifier to output a second signal after the first frequency band limitation, a decision unit that decides a first cutoff frequency of the first frequency band limitation based on a carrier interval of the multi-carrier signal, and an updating unit that updates a distortion compensation coefficient to be used for compensation of the nonlinear distortion, based on an error between the second signal and the multi-carrier signal.
摘要翻译：用于补偿放大多载波信号功率的放大器的非线性失真的失真补偿装置包括频带限制单元，其对从放大器反馈的第一信号施加第一频带限制，以在第一频率之后输出第二信号频带限制，决定单元，其基于所述多载波信号的载波间隔来决定所述第一频带限制的第一截止频率;以及更新单元，其更新要用于所述非线性失真的补偿的失真补偿系数，基于第二信号和多载波信号之间的误差。

7. 发明授权

US09190964B2 Distortion compensation device and distortion compensation method 有权
标题翻译：失真补偿装置和失真补偿方法
公开(公告)号：US09190964B2
公开(公告)日：2015-11-17
申请号：US14056235
申请日：2013-10-17
申请人： FUJITSU LIMITED
发明人： Yuichi Utsunomiya , Hiroyoshi Ishikawa , Toshio Kawasaki , Alexander Nikolaevich Lozhkin , Kazuo Nagatani
IPC分类号： H03F1/32 , H03F3/24
CPC分类号： H03F1/3247 , H03F3/24
摘要： A distortion compensation device includes: a distortion compensator configured to output, to a power amplifier, a predistortion signal obtained by performing distortion compensation processing on a transmission signal by using a distortion compensation coefficient, wherein the distortion compensator limits bands of a reference signal and a feedback signal so that the bands fall in a pass band and updates the distortion compensation coefficient based on an error between the reference signal and the feedback signal, the reference signal corresponding to the predistortion signal, the feedback signal corresponding to an output feedback of the power amplifier.
摘要翻译：失真补偿装置包括：失真补偿器，被配置为通过使用失真补偿系数向功率放大器输出通过对发送信号执行失真补偿处理而获得的预失真信号，其中所述失真补偿器限制参考信号的频带和反馈信号，使得频带落在通带中，并且基于参考信号和反馈信号之间的误差来更新失真补偿系数，对应于预失真信号的参考信号，对应于功率的输出反馈的反馈信号放大器

8. 发明授权

US10904060B2 Peak suppression circuit, peak suppression method, and transmitter 有权
公开(公告)号：US10904060B2
公开(公告)日：2021-01-26
申请号：US16529455
申请日：2019-08-01
申请人： FUJITSU LIMITED
发明人： Hiroyoshi Ishikawa , Shinichiro Kobayashi
IPC分类号： H04B1/04 , H04L27/26
摘要： A peak suppression circuit includes a memory, and a processor coupled to the memory and the processor configured to suppress a first peak of a transmission signal according to a first sampling signal having a predetermined period, delay the transmission signal where the first peak is suppressed by a predetermined time corresponding to a period shorter than the predetermined period, and suppress a second peak of the delayed transmission signal according to a second sampling signal having the predetermined period.

9. 发明授权

US10659124B2 Multiantenna communication device and coefficient update method 有权
公开(公告)号：US10659124B2
公开(公告)日：2020-05-19
申请号：US16287767
申请日：2019-02-27
申请人： FUJITSU LIMITED
发明人： Takenori Ohshima , Yoji Ohashi , Hiroyoshi Ishikawa , Atsushi Honda , Toru Maniwa , Alexander Nikolaevich Lozhkin , Toshio Kawasaki , Yuichi Utsunomiya , Tomoya Ota
IPC分类号： H04L27/00 , H04B7/06 , H04B1/04
摘要： A multiantenna communication device forms a directional beam by adding an antenna weight to respective signals of a plurality of antenna elements. The multiantenna communication device includes: a processor that executes performing distortion compensation on a transmission signal by using a distortion compensation coefficient; a plurality of power amplifiers that are provided corresponding to the antenna elements, and that amplify the transmission signal subjected to the distortion compensation by the processor; a multiplexer that multiplexes signals output from the power amplifiers to feed back; and an analog/digital (A/D) converter that A/D converts a multiplex feedback signal that is obtained by the multiplexer, wherein the processor executes updating the distortion compensation coefficient by using the multiplex feedback signal A/D converted by the A/D converter and the transmission signal.

10. 发明授权

US09819370B2 Distortion compensation device and distortion compensation method 有权
公开(公告)号：US09819370B2
公开(公告)日：2017-11-14
申请号：US14945801
申请日：2015-11-19
申请人： FUJITSU LIMITED
发明人： Hiroyoshi Ishikawa , Tomoya Ota , Kazuo Nagatani
IPC分类号： H04B1/04
CPC分类号： H04B1/0475 , H03F1/3241 , H04B2001/0425
摘要： A distortion compensation device includes: a storage configured to store a distortion compensation coefficient for compensating a distortion of a transmission signal to be amplified and transmitted, by corresponding to a combination of a plurality of addresses; a first generator configured to generate a first address according to a power or an amplitude of an input signal; a second generator configured to generate a second address according to a first vector to interconnect sample points on an IQ plane where the sample points of the input signal are drawn in time series; and a distortion compensation unit configured to acquire the distortion compensation coefficient corresponding to a combination of the first address and the second address from the storage, and to perform a predistortion processing on the input signal, by using the acquired distortion compensation coefficient, so as to generate the transmission signal.

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