ofdm系统仿真 含16qam调制 fft 加窗 加cp等模块，利用最小二乘法进行拟合多元非线性方程，鲁棒性好，性能优越。- ofdm system simulation including 16qam modulation fft windowing modules plus cp, Multivariate least squares fitting method of nonlinear equations, Robustness, superior performance.