ofdm系统仿真 含16qam调制 fft 加窗 加cp等模块，通过matlab代码，计算目标和海洋回波的功率谱密度。- ofdm system simulation including 16qam modulation fft windowing modules plus cp, By matlab code, Calculating a target and ocean echo power spectral density.

语音信号是一个非平稳时变的信号，所以用计算稳态信号的方法计算功率谱密度函数没有太大意义，看不出信号的动态变化，"gonglvpu"给出计算短时功率谱密度函数(Speech signal is a non-stationary time-varying signal, so it is not very meaningful to calculate the power spectral density function by calculating the steady-st