非线性信道均衡不动点算法

Nonlinear Channel Equalization Fixed Point Approach

针对PSK调制方式下的非线性信道提出一种新的非线性均衡算法。采用Volterra级数序列来建立非线性信道模型,对于这样的信道,均衡问题就可看作一个截短映射的不动点问题,它利用迭代的方式来消除信道中的非线性畸变。这种算法易于实现,只需要增加额外的处理单元而不改变信道模型的结构。用计算机仿真来实现采用该算法的均衡器可以有效地消除线性和非线性码间串扰。

A new nonlinear equalizer for digital transmission over a nonlinear channel with a PSK modulation is presented. The nonlinear channel under consideration is assumed to have a Volterra series representation. Under certain conditions, this problem can be regarded as a fixed point problem involving a contraction mapping. An interative nonlinear equalization scheme is presented to combat the nonlinear distortion in the digital channel. This method is easy to design, and the performance can be improved by adding additional processing units without changing the organic structure. The computer simulation shows the proposed equalizer can effectively remove the inter-symbol interference （linear and nonlinear） .