功率谱密度估计。welch法功率谱密度估计，协方差法估计，Burg法估计。-psd estimate。welch，covariance，Burg。

运用PSD CPSD方法进行信道估计，不需要信道先验知识，可灵活添加功能，用于FBMC系统研究，性能优越-Use PSD CPSD method for channel estimation, the channel does not require prior knowledge, the flexibility to add functionality, FBMC System for superior performance

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

OFDM with qpsk modulation PSD performance