信号处理中的旋转不变子空间法，借鉴了主成分分析算法（PCA），可以广泛的应用于数据预测及数据分析,BP神经网络用于函数拟合与模式识别，自己编的5种调制信号，采用波束成形技术的BER计算。- Signal Processing ESPRIT method, It draws on principal component analysis algorithm (PCA), Can be widely used in data analysis and forecast data, BP neural network function fitting and pattern recognition, Own five modulation signal, By applying the beam forming technology of BE.