任意均分间隔的预失真结构

基带预失真技术是解决调制器输出信号出现的幅度失真和群时延失真的有效方法。对于全数字高速调制器的升采样、软件无线电和中频数模转换器（DAC）等特点,传统的码元间隔滤波和分数间隔滤波结构难以取得很好的效果。针对这一问题，提出了一种新的任意均分间隔的滤波结构,跳过重采样,直接对升采样后的数据做自适应滤波,可以获得更好的预失真效果。Matlab仿真得到的任意均分间隔滤波结构效果好于码元间隔滤波结构,且实测结果表明该结构可以显著减少高速调制器输出信号的失真。

An arbitrary equationally spaced predistortion structure

Predistortion technology is an effective solution to the amplitude distortion and group delay distortion of the output signal from modulator. Traditional symbol space filtering and fractional space filtering structure cannot achieve good effect for the upsampling,software radio and intermediate frequency digital analog converter(DAC) characters of modulator. To solve this problem,a new arbitrary equationally spaced filtering structure is proposed,which skips resampling and directly performs adaptive filtering to the upsampling data,thus achieving better predistortion performance. The Matlab simulation illustrates that arbitrary equationally spaced structure is better than symbol space structure and measured results show that this new structure can reduce the output signal distortion of modulator.