基于Simulink的坐标变换多模盲均衡算法建模与仿真

针对传统的常模盲均衡算法(CMA)均衡高阶正交幅度调制(QAM)信号会产生失效问题,在利用坐标变换、双曲正切误差函数和非线性判决反馈结构特点的基础上,提出了一种基于坐标变换的多模盲均衡算法(CTHMMADFE)。该算法通过坐标变换将高阶非常模QAM信号变为常模4QAM信号,利用双曲正切函数作误差函数,利用判决反馈结构非线性特性进一步补偿信道非线性影响。通过M文件对CTHMMADFE的性能进行验证,在获得性能最佳时算法中各参数值后,由这些参数构建CTHMMADFE的Simulink仿真模型。

The Modeling and Simulation of Coordinate Transformation Multi- Modulus Blind Equalization Algorithm Based on Simulink

Aiming at the invalidation of traditional constant modulus blind equalization algorithm(CMA) in equalizing higher order QAM signals, on the basis of making full use of the features of coordinate transformation, hyperbolic tangent function, and decision feedback structure, coordinate transformation multi-modulus blind equalization algorithm(CTHMMADFE) is proposed. In this proposed algorithm, higher order non-constant modulus QAM signals are modified as constant modulus 4QAM signals, hyperbolic tangent function is used as error function, and non-linear decision feedback structure are used to suppress the influence of the non-linear channels on signals. The performance of the proposed CTHMMADFE algorithm is simulated by the M file of MATLAB. After the optimum performance parameters of the proposed CTHMMADFE algorithm are obtained, the Simulink simulation model of the CTHMMADFE algorithm can be established.