公开(公告)号：US07042283B2

公开(公告)日：2006-05-09

申请号：US10806245

申请日：2004-03-23

申请人： Yasunori Suzuki ,  Shinji Mizuta ,  Tetsuo Hirota ,  Yasushi Yamao

发明人： Yasunori Suzuki ,  Shinji Mizuta ,  Tetsuo Hirota ,  Yasushi Yamao

IPC分类号： H03F3/66

CPC分类号： H03F3/24 ,  H03F1/0288 ,  H03F1/3258 ,  H03F2200/393

摘要： A transmission signal and a pilot signal are predistorted by a digital predistorter 13 by use of a power-series model, and the predistorted output is converted by a digital-analog converter 14 to an analog signal. The analog signal is up converted by a frequency converter 15 to an RF-band signal, which is transmitted after being power-amplified by a Doherty amplifier 16. The pilot signal is extracted by a pilot signal extractor 17 from the output from the Doherty amplifier, and the extracted pilot signal is down converted by a frequency converter 18 to a baseband signal. The baseband pilot signal is converted by an analog-digital converter 19 to a digital pilot signal. A control part 21 detects an odd-order distortion component from the digital pilot signal, and based on the detected result, controls parameters of the digital predistorter.

摘要翻译： 传输信号和导频信号由数字预失真器13通过使用功率系列模型进行预失真，并且预失真输出由数模转换器14转换为模拟信号。 模拟信号由频率转换器15上变频到RF带信号，该信号在由Doherty放大器16进行功率放大后传输。 导频信号由导频信号提取器17从Doherty放大器的输出提取，并且提取的导频信号由频率转换器18下变频到基带信号。 基带导频信号由模拟数字转换器19转换成数字导频信号。 控制部分21从数字导频信号中检测奇数失真分量，并根据检测结果控制数字预失真器的参数。