利用最小二乘算法实现对三维平面的拟合，用于建立主成分分析模型，ofdm系统仿真 含16qam调制 fft 加窗 加cp等模块。- Least-squares algorithm to fit a three-dimensional plane, Principal component analysis model for establishing, ofdm system simulation including 16qam modulation fft windowing modules pl