基于二次样条函数的功放数字预失真算法  

A Novel Digital Predistortion Algorithm Based on Quadratic Spline

作　　者：刘学[1] 

机构地区：[1]上海贝尔股份有限公司,上海201206

出　　处：《信息通信》2015年第10期7-9,共3页Information & Communications

摘　　要：功放的非线性特性极易产生频谱扩展,这种扩展会对临近信道产生干扰。现在基于样条的预失真算法几乎都使用的三次样条,也就是样条的多项式函数阶数最多只有三次。文章提出了一种新的基于二次样条的功放数字预失真算法。二次样条函数的平滑特性可以很好地逼近功放的非线性模型,有效克服功放非线性效应对频谱产生的影响。仿真和实现的结果表明,这种新的算法性能既优于传统的基于最小均方的数字预失真算法,也优于现在一般的三次样条预失真算法。The nonlinear effect of power amplifier creates spectral growth（broadening） beyond the signal bandwidth, which interferes with adjacent channels. Most of current spline based predistortion algorithms use cubic spline. A predistortion algorithm based on quadratic spline is presented, which can well approximate the nonlinear character of power amplifier and effectively remove the nonlinear effect. The simulation result verifies that the performance of the method introduced in this paper is not only better than that of the traditional algorithm based on Least Mean Square but also better than that based on the cubic spline.

关 键 词：样条函数 数字预失真 非线性效应 功率放大器 

分 类 号：TN722.75[电子电信—电路与系统]