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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. 发明申请

US20170149458A1 DISTORTION COMPENSATION DEVICE AND DISTORTION COMPENSATION METHOD 审中-公开
公开(公告)号：US20170149458A1
公开(公告)日：2017-05-25
申请号：US15286777
申请日：2016-10-06
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 , H04B2001/0425
摘要： A distortion compensation device includes an address generating unit, an LUT, and a multiplier. The address generating unit calculates the magnitude of a first vector and the angle formed by the first vector and a second vector. The first vector is represented by using the origin in an IQ coordinate plane as the starting point and using a transmission signal point at a first time as the end point. The second vector is represented by using a transmission signal point at a second time that is predetermined time before the first time as the starting point and using the transmission signal point at the first time as the end point. The LUT specifies a distortion compensation coefficient by using the calculated magnitude and the calculated angle. The multiplier performs a predistortion process on a transmission signal input to an amplifier by using the specified distortion compensation coefficient.

3. 发明申请

US20150372850A1 PEAK SUPPRESSION APPARATUS 有权
标题翻译：峰值抑制装置
公开(公告)号：US20150372850A1
公开(公告)日：2015-12-24
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： H04L27/26 , H04B15/00 , H04B1/04
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

4. 发明授权

US09819372B2 Radio communication device and burst distortion correcting method 有权
公开(公告)号：US09819372B2
公开(公告)日：2017-11-14
申请号：US15238399
申请日：2016-08-16
申请人： FUJITSU LIMITED
发明人： Yuichi Utsunomiya , Daisuke Ogawa , Hiroyoshi Ishikawa , Kazuo Nagatani
IPC分类号： H03D1/04 , H04L25/08 , H04B15/00 , H04B1/04 , H03F1/32 , H03F3/24 , H03F3/19 , H04L5/14 , H04L27/36
CPC分类号： H04B1/0475 , H03F1/3247 , H03F1/3258 , H03F3/19 , H03F3/245 , H04B2001/0416 , H04B2001/0425 , H04L5/14 , H04L27/368
摘要： A radio communication device includes: an instantaneous coefficient acquisition unit that acquires an instantaneous coefficient that corrects an instantaneous change contained in a burst distortion corresponding to an elapsed time from a top of a burst signal in which a constant power level continues and instantaneously changes the power level of the burst signal; an average coefficient acquisition unit that acquires an average coefficient that corrects an average change contained in the burst distortion and gradually changes the power level of the burst signal from the top to an end of the burst signal; a synthesizer that synthesizes the instantaneous coefficient acquired by the instantaneous coefficient acquisition unit with the average coefficient acquired by the average coefficient acquisition unit; and a corrector that uses a correction coefficient obtained from the synthesizing by the synthesizer to correct the burst distortion occurring in the burst signal.

5. 发明授权

US09813273B2 Peak suppression device 有权
公开(公告)号：US09813273B2
公开(公告)日：2017-11-07
申请号：US14862557
申请日：2015-09-23
申请人： FUJITSU LIMITED
发明人： Hiroyoshi Ishikawa , Toshio Kawasaki , Hikaru Ishikawa , Kazuo Nagatani
IPC分类号： H04L27/26 , H04L25/03 , H04L25/49
CPC分类号： H04L27/2624 , H04B2201/70706 , H04L25/03834
摘要： A peak suppression device includes an acquiring unit that acquires multiple envelopes of carrier signals that are included in a multicarrier signal, an adding unit that adds the envelopes to generate a combined envelope, a detecting unit that detects a peak value and a peak timing of the multicarrier signal by using the combined envelope, and a suppressing unit that suppresses a peak of the multicarrier signal in accordance with the peak value and the peak timing.

6. 发明申请

US20170063406A1 RADIO COMMUNICATION DEVICE AND BURST DISTORTION CORRECTING METHOD 有权
标题翻译：无线电通信设备和BURST失真校正方法
公开(公告)号：US20170063406A1
公开(公告)日：2017-03-02
申请号：US15238399
申请日：2016-08-16
申请人： FUJITSU LIMITED
发明人： Yuichi Utsunomiya , DAISUKE OGAWA , HIROYOSHI ISHIKAWA , Kazuo Nagatani
IPC分类号： H04B1/04
CPC分类号： H04B1/0475 , H03F1/3247 , H03F1/3258 , H03F3/19 , H03F3/245 , H04B2001/0416 , H04B2001/0425 , H04L5/14 , H04L27/368
摘要： A radio communication device includes: an instantaneous coefficient acquisition unit that acquires an instantaneous coefficient that corrects an instantaneous change contained in a burst distortion corresponding to an elapsed time from a top of a burst signal in which a constant power level continues and instantaneously changes the power level of the burst signal; an average coefficient acquisition unit that acquires an average coefficient that corrects an average change contained in the burst distortion and gradually changes the power level of the burst signal from the top to an end of the burst signal; a synthesizer that synthesizes the instantaneous coefficient acquired by the instantaneous coefficient acquisition unit with the average coefficient acquired by the average coefficient acquisition unit; and a corrector that uses a correction coefficient obtained from the synthesizing by the synthesizer to correct the burst distortion occurring in the burst signal.
摘要翻译：一种无线电通信装置，包括：瞬时系数获取单元，其获取瞬时系数，该瞬时系数校正与从恒定功率电平持续并瞬时改变功率的突发信号的顶部起的经过时间对应的突发畸变中包含的瞬时变化突发信号的电平; 平均系数获取单元，其获取校正所述突发畸变中包含的平均变化的平均系数，并且从所述突发信号的顶部逐渐改变所述突发信号的功率电平; 合成器，其将由瞬时系数获取单元获取的瞬时系数与由平均系数获取单元获取的平均系数合成; 以及校正器，其使用从合成器的合成获得的校正系数来校正突发信号中出现的突发失真。

7. 发明授权

US09236893B2 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：US09236893B2
公开(公告)日：2016-01-12
申请号：US14682861
申请日：2015-04-09
申请人： FUJITSU LIMITED
发明人： Hiroyoshi Ishikawa , Kazuo Nagatani
IPC分类号： H04B1/04 , H04L5/00 , H04B15/00
CPC分类号： H04B1/0475 , H03F1/3247 , H03F1/3258 , H03F3/195 , H03F3/24 , H03F3/245 , H03F2200/204 , H03F2200/336 , H04B1/04 , H04B15/00 , H04B2001/0408 , H04B2001/0433 , H04L5/0048
摘要： A distortion compensation device which compensates for a distortion of an amplifier includes an FIR filter, a calculation unit that calculates an error between a reference signal and a feedback signal from the amplifier, an update unit that updates a coefficient set to the FIR filter on the basis of the error, and a delay unit that, on the basis of a magnitude of the coefficient, delays the feedback signal while controlling a delay of the feedback signal with respect to the reference signal.
摘要翻译：补偿放大器失真的失真补偿装置包括FIR滤波器，计算基准信号与来自放大器的反馈信号之间的误差的计算单元，更新单元，其更新在FIR滤波器上设定的系数以及延迟单元，其基于系数的幅度延迟反馈信号，同时控制反馈信号相对于参考信号的延迟。

8. 发明申请

US20180054170A1 DISTORTION COMPENSATION DEVICE AND COEFFICIENT UPDATE METHOD 审中-公开
公开(公告)号：US20180054170A1
公开(公告)日：2018-02-22
申请号：US15676211
申请日：2017-08-14
申请人： FUJITSU LIMITED
发明人： Hiroaki Arai , HIROYOSHI ISHIKAWA , Kazuo Nagatani
IPC分类号： H03F1/32 , H03F3/24 , H04L27/36 , H04B1/04 , H04L25/03 , H04L27/26
CPC分类号： H03F1/3247 , H03F3/24 , H03F2200/66 , H03F2201/3224 , H03F2201/3233 , H04B1/0475 , H04B2001/0425 , H04B2001/0433 , H04L25/03343 , H04L27/2614 , H04L27/2623 , H04L27/368
摘要： A distortion compensation device includes a distortion compensation unit, a feedback coefficient calculating unit, a clip processing unit, and an updating unit. The distortion compensation unit generates a distortion compensation signal from a transmission signal by using a distortion compensation coefficient and inputs the generated distortion compensation signal to a power amplifier. The feedback coefficient calculating unit calculates a feedback coefficient based on an output signal from the power amplifier. The clip processing unit outputs the feedback coefficient when absolute value of the feedback coefficient is less than a threshold. Furthermore, the clip processing unit outputs a feedback coefficient of which absolute value is less than the threshold when the absolute value of the feedback coefficient is greater than the threshold. The updating unit updates the distortion compensation coefficient by using an error between the transmission signal and the output signal, a predetermined step coefficient, and the feedback coefficient.

9. 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.

10. 发明授权

US09755877B2 Peak suppression device and peak suppression method 有权
公开(公告)号：US09755877B2
公开(公告)日：2017-09-05
申请号：US15055342
申请日：2016-02-26
申请人： FUJITSU LIMITED
发明人： Hiroyoshi Ishikawa , Hikaru Ishikawa , Kazuo Nagatani , Takuro Nishikawa , Ryo Koizumi , Takeshi Sugiyama , Yasuharu Amezawa
IPC分类号： H04L27/26
CPC分类号： H04L27/2623 , H04L27/2626
摘要： A peak suppression device includes a suppression-signal generating unit and a band pass filter (BPF). The suppression-signal generating unit generates a suppression signal that is obtained by adding, to a transmission signal, a frequency component in which components of frequencies from a boundary of a band of the transmission signal to a frequency that is away therefrom toward an out-band of the transmission signal by predetermined frequencies are attenuated, out of frequency components of a signal to suppress a peak of the transmission signal. The BPF attenuates, after the suppression signal is amplified by the amplifier, a frequency component outside the band of the transmission signal in the amplified suppression signal.

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