基于双曲正切误差函数常数模算法的DSP实现

Hardware Implementation for Algorithm of Constant Modulus Based on Error Function of Hyperbolic Tangent

基于双曲正切误差函数的常数模算法,利用误差函数曲线关于零误差对称性来降低稳态误差,因而具有实用性。为了用DSP实现该算法,在Matlab平台上,采用水声信道对该算法进行了仿真研究,得到最佳均衡器权长、变步长特性参数。在此基础上,进行了该算法的DSP硬件模块及软件编程流程的设计,给出了软件代码编写的关键点及DSP仿真结果。结果表明:该算法的DSP实现效果良好。

Hyperbolic tangent error function based constant modulus algorithm（HECMA） is very practical because that its steady-state error can be reduced effectively by using the symmetry of the hyperbolic tangent error function about zero error. In order to implement this algorithm by DSP, the optimum equalizer length and characteristic parameters of variable step-size are first obtained via the Matlab experiment with underwater sound channel equalization, then the hardware modules of DSP and software flows for program are designed. Finally, the key points of software programming and DSP simulation result are given. The simulation result proves the effectiveness of the HECMA implementation by DSP.