基于LMS算法的自适应数字预失真技术研究

Research on the Adaptive Digital Pre-Distortion Technique Based on the LMS Algorithm

文章研究了基于查找表LUT方法的功率放大器自适应数字预失真技术。针对传统的基于线性收敛算法的自适应收敛速度较慢的不足,文章根据自适应滤波理论中的LMS算法,推导并仿真验证了适用于功率放大器自适应数字预失真技术的LMS算法,并从功率放大器的传输特性、输出频谱等方面将此算法与线性收敛的Rascal算法进行比较,仿真结果表明了LMS算法收敛速度更快、预失真效果更好。

A adaptive digital pre-distortion algorithm for power amplifier based on look up table is presented. This algorithm addresses the problem of using linear convergent algorithm which adaptive constringency is slow, according to the LMS algorithm in the adaptive filter system, a adaptive digital pre-distortion algorithm for power amplifier based on LMS algorithm is presented and validated, the LMS algorithm is compared with Rascal algorithm in transfer character and output spectrum of power amplifier. Simulation results show that convergent speed and predistortion effect of the LMS algorithm is better.