中文说明：是学习PCA特征提取的很好的学习资料，已调制信号计算其普相关密度，BP神经网络用于函数拟合与模式识别，保证准确无误，是学习通信的好帮手，现代信号处理中谱估计在matlab中的使用，多元数据分析的主分量分析投影。
English Description：
Is learning PCA feature extraction of good learning materials, has been modulated signal calculation relative density of the universal, the BP neural network for function approximation and pattern recognition and to ensure the accuracy, is a good helper to learn communication, modern signal processing in spectrum estimation in MATLAB, multivariate data analysis principal component projection analysis.