公开(公告)号：US20140145788A1

公开(公告)日：2014-05-29

申请号：US14010064

申请日：2013-08-26

申请人： FUJITSU LIMITED

发明人： Satoshi MATSUBARA ,  Mitsuharu HAMANO ,  Hideharu SHAKO

IPC分类号： H03F1/32

CPC分类号： H03F1/3241 ,  H03F1/3258 ,  H03F3/189 ,  H03F3/24 ,  H03F2200/336 ,  H03F2201/3233

摘要： A distortion compensation device includes a storage unit, an address generator, and a distortion compensation processor. The storage unit stores therein a distortion compensation coefficient for compensating distortion generated in an amplifier for amplifying an input signal. The address generator generates a first address based on a power value of the signal at a current time. Furthermore, the address generator delays, every time a new augend is input, the sum of the power value of the signal at the current time and the augend. The address generator generates a second address based on the sum obtained by calculating a new augend, from the delayed sum. The distortion compensation processor acquires a distortion compensation coefficient corresponding to a combination of the first address and the second address from the storage unit and performs distortion compensation processing on the signal by using the acquired distortion compensation coefficient.

摘要翻译： 失真补偿装置包括存储单元，地址发生器和失真补偿处理器。 存储单元存储用于补偿放大器中产生的用于放大输入信号的失真的失真补偿系数。 地址产生器基于当前时间的信号的功率值产生第一地址。 此外，每当输入新的加法器时，地址发生器都会延迟当前时间的信号功率和加法器的总和。 地址发生器基于通过从延迟和计算新的加法而获得的总和来生成第二地址。 失真补偿处理器从存储单元获取对应于第一地址和第二地址的组合的失真补偿系数，并通过使用所获取的失真补偿系数对该信号执行失真补偿处理。

公开(公告)号：US20140106692A1

公开(公告)日：2014-04-17

申请号：US13951809

申请日：2013-07-26

申请人： FUJITSU LIMITED

发明人： Satoshi MATSUBARA ,  Hideharu SHAKO

IPC分类号： H04B1/04

CPC分类号： H04B1/04 ,  H03F1/34 ,  H03F3/195 ,  H03F3/24 ,  H03F3/72 ,  H03F2200/411 ,  H04B2001/0433

摘要： A transmission apparatus includes: an amplifier configured to amplify a transmission signal; a calculation unit configured to calculate a standing-wave ratio based on the transmission signal and a signal from an antenna to the amplifier; and a controller configured to switch a state of the amplifier based on the state of the amplifier and the standing-wave ratio.

摘要翻译： 发送装置包括：被配置为放大发送信号的放大器; 计算单元，被配置为基于所述发送信号和从天线到所述放大器的信号来计算驻波比; 以及控制器，被配置为基于放大器的状态和驻波比来切换放大器的状态。

公开(公告)号：US20140003554A1

公开(公告)日：2014-01-02

申请号：US13895014

申请日：2013-05-15

申请人： FUJITSU LIMITED

发明人： Satoshi MATSUBARA ,  Hideharu SHAKO ,  Mitsuharu HAMANO

IPC分类号： H04B1/04

CPC分类号： H04B1/0475 ,  H03F1/3241 ,  H04B2001/0425

摘要： In a distortion compensating unit, a threshold calculating unit calculates a clip threshold to be set in an adjusting unit based on an address value generated by an address generating circuit. For example, the threshold calculating unit calculates the clip threshold by identifying the maximum value of address values generated by the address generating circuit in each adjustment unit period and subtracting a certain offset value from the identified maximum value. The adjusting unit adjusts a distortion compensation coefficient based on an address value received from the address generating circuit and a magnitude relationship with the set clip threshold.

摘要翻译： 在失真补偿单元中，阈值计算单元基于由地址发生电路产生的地址值来计算要在调整单元中设置的限幅阈值。 例如，阈值计算单元通过在每个调整单位期间中识别由地址生成电路生成的地址值的最大值来计算剪辑阈值，并从所识别的最大值中减去一定的偏移值。 调整单元基于从地址生成电路接收到的地址值和与设定剪辑阈值的大小关系来调整失真补偿系数。

公开(公告)号：US20130259154A1

公开(公告)日：2013-10-03

申请号：US13753818

申请日：2013-01-30

申请人： FUJITSU LIMITED

发明人： Hikaru ISHIKAWA ,  Satoshi MATSUBARA ,  Hideharu SHAKO

IPC分类号： H04B15/00

CPC分类号： H04B15/00 ,  H03F1/3241 ,  H04B1/0475 ,  H04B2001/0425

摘要： A wireless apparatus includes amplifying systems each including a storing unit storing a distortion compensation coefficient for compensation for a nonlinear distortion of one or more transmission signals, a compensator compensating for the nonlinear distortion using the distortion compensation coefficient stored in the storing unit, and an amplifier amplifying the transmission signal after distortion compensation. The wireless apparatus further includes a switch that selects feedback signals corresponding to the transmission signals output from the amplifying systems, a subtractor that derives one or more differences between the feedback signal selected in the switch and the transmission signal, a first calculator that derives a distortion compensation coefficient that restricts the difference derived in the subtractor, and a switch controller that controls a length of time during which the feedback signal is selected in the switch depending on magnitude of distortion of the transmission signal output from the amplifying system.

摘要翻译： 无线装置包括放大系统，每个放大系统包括存储单元，该存储单元存储用于补偿一个或多个发送信号的非线性失真的失真补偿系数，使用存储在存储单元中的失真补偿系数补偿非线性失真的补偿器，以及放大器 在失真补偿后放大传输信号。 所述无线装置还包括选择与从所述放大系统输出的发送信号对应的反馈信号的开关，导出所述开关中选择的反馈信号与所述发送信号之间的一个或多个差异的减法器，导出失真的第一计算器 限制在减法器中导出的差异的补偿系数;以及开关控制器，其根据从放大系统输出的发送信号的失真的大小来控制在开关中选择反馈信号的时间长度。