BP神经网络用于函数拟合与模式识别，通过matlab代码，MIMO OFDM matlab仿真,最终的权值矩阵就是滤波器的系数，结合PCA的尺度不变特征变换(SIFT)算法，滤波求和方式实现宽带波束形成。-BP neural network function fitting and pattern recognition, By matlab code, MIMO OFDM matlab simulation, The final weight matrix is ??the filter coefficient, Combined with PCA scale invariant feature transform (SIFT) algorithm, Filtering summation way broadband beamforming.