FFT算法进行ＦＦＴ　,ＩＦＦＴ,功率谱计算,包括Hamming 窗,Hanning 窗,triangle 窗,Black()

信噪比（即信号功率谱与噪声功率谱之和）为常数时，系统才能达到总信道容量最大的要求。(When the signal to noise ratio (i.e. the sum of the signal power spectrum and the noise power spectrum) is constant, the system can achieve the maximum total channel capacity.)

FFT算法进行ＦＦＴ　,ＩＦＦＴ,功率谱计算,包括Hamming 窗,Hanning 窗,triangle 窗,Black()