利用自相关函数法和周期图法实现随机信号的功率谱估计-Use of the autocorrelation function and periodogram method to achieve random signal power spectrum estimation

psd cpsd C语言实现方法，随机信号产生，随机信道参数，使用fftw函数库辅助计算fft-psd cpsd C language implementation, the random signal is generated, random channel parameters, use fftw library helper function computing fft