结合PCA的尺度不变特征变换(SIFT)算法，BP神经网络用于函数拟合与模式识别，MIMO OFDM matlab仿真,最大似然（ML）准则和最大后验概率（MAP）准则，单径或多径瑞利衰落信道仿真，时间序列数据分析中的梅林变换工具。- Combined with PCA scale invariant feature transform (SIFT) algorithm, BP neural network function fitting and pattern recognition, MIMO OFDM matlab simulation, Maximum Likelihood (ML) criteria and maximum a posteriori (MAP) criterion, Single path or multipath Rayleigh fading channel simulation, Time series data analysis Mellin transform tool.