基于升余弦滤波的基带预失真环路延迟补偿

Loop delay compensation for baseband predistorter based on raised cosine filter

传统的基带预失真环路延迟估计和补偿方法估计过程复杂,收敛速度慢,补偿信号存在混迭失真,影响预失真系统的性能。为此,提出了一种新的基带预失真器环路延迟估计和补偿方法,该方法采用黄金分割法完成环路延迟搜索,用升余弦滤波器完成环路延迟补偿。其环路延迟估计搜索速度快,准确度高,环路延迟补偿后信号失真小,应用该方法的基带预失真系统NMSE指标较传统方法优化17 dB。

There are deficiencies in traditional loop delay （LD） estimation and compensation methods such as the complex LD estimation process, the slow convergence speed, and influence of the aliasing distortion of compensating operation on the performance of the predistorter. Therefore, a novel LD estimation and compensation method for baseband predistorter was proposed, namely the golden section method for the LD research and the raised cosine filter for LD compensation. This method has such advantages as fast convergence speed, high convergence precision and less aliasing distortion. As for the NMSE of the predistorter, this method can optimize 17 dB better than the other traditional methods.