并行单型规范分片线性函数极坐标数字预失真器

Parallel polar digital predistorter based on simplicial canonical piecewise linear function

介绍了一种并行的基于单型规范分片线性(SCPWL)函数的极坐标数字预失真器模型。首先根据分片线性拟合原理引入绝对值型的单型规范分片线性函数,建立模型解析方程并推导出模型参数的最小二乘解,然后根据模型特点设计了数字预失真器的并行实现架构,并对模型架构的工作顺序和参数提取过程进行了介绍。仿真结果表明SCPWL极坐标预失真器远远优于传统的功率回退线性化技术,且与常用的复多项式预失真器相比较,尤其是在过饱和非线性失真情况下,其线性补偿能力要优于后者。

This paper presents a parallel polar digital predistorter by Simplicial Canonical PieceWise Linear（SCPWL） function.Firstly,the paper introduces an absolute value model SCPWL function that based on piecewise linear approximation theory,and derives the least square solution of the function.Then,according to the characteristic of the SCPWL model,parallel polar digital predistorter architecture is designed.And also the operation order and parameters extraction process of the predistorter structures are introduced.Lastly,the simulation experiment is carried out and the simulation results prove the SCPWL predistorter is far superior to the traditional power back-off linearization technique.Compared with complex polynomials predistorter,the nonlinear compensation capability of the SCPWL predistorter outperform the polynomials,especially in the supersaturated nonlinear distortion of PA.