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An Adaptive Nonlinear Predistorter for HPA with Memory in OFDM Systems
Author(s): 
Pages: 35-38
Year: Issue:  7
Journal: VIDEO ENGINEERING

Keyword:  非线性放大器正交频分复用查找表最小均方误差准则(LMS)预矫正器Volterra方法;
Abstract: 提出了一种新的在OFDM系统中针对有记忆非线性放大器的自适应预矫正器的结构.先将有记忆的非线性放大器建模成一个维纳(Wiener)系统,然后通过串连一个LMS算法的自适应线性滤波器和一个基于查找表的无记忆预矫正器来实现对此类非线性系统的预矫正.这种结构的训练过程也相应地涉及到两个串连的自适应算法.同传统的Volterra预矫正器相比,该结构更为简单;同时,在记忆长度相同的情况下,性能也可以更好.
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