部分精英策略并行遗传优化的神经网络盲均衡

Neural network blind equalization optimized by parallel genetic algorithm with partial elitist strategy

针对高维非凸代价函数下神经网络盲均衡算法收敛速度慢、容易陷入局部极小值的缺点,提出了一种组群并行遗传优化神经网络的方法。根据神经网络拓扑结构进行个体编码,设置控制码和权重系数码以实现对网络拓扑结构和网络权重同时优化。优化迭代过程中根据适应度对个体排序分组,以融合不同遗传算子条件下遗传算法的优势。部分精英策略有效避免最优个体把持进化过程引发早熟的现象。非线性信道条件下的仿真结果证明方法具有更好的收敛性能。

Owing to the disadvantage of slow convergence and easy to fall into local minimum of the neural network blind equalization algorithm under high dimensional and non-convex cost function, a parallel genetic algorithm（GA） with partial elitist strategy was proposed to optimize neural network training. According to the neural network topology, individual coding, the control code and the weights were set up to realize the network topology structure and the network weights simultaneously. The individual group was sorted according to the adaptation degree of the optimization iterative process, in order to integrate the advantages of genetic algorithm under the conditions of different genetic operators. Some elite strategies effectively avoid the phenomenon of premature phenomena caused by the optimal individual control in the process of evolution. The simulation results under the nonlinear channel condition show that the method has better convergence performance.