中文说明：应用背景高斯白噪声在通信系统仿真中占据重要地位，了解其性能是非常重要的。本代码编写了高斯白噪声随机信号的低通、带通、高通三种情况下的任意带宽频谱。关键技术编写Matlab通用程序，求任意带宽的低通、高通、带通高斯白噪声的自相关函数，自协方差函数和功率谱密度函数。标明带宽，画出原信号时域波形和各函数波形图。
English Description：
Application backgroundGauss white noise plays an important role in the communication system simulation, and it is very important to understand its performance.. This code has written the Gauss white noise random signal low-pass, band-pass, high pass three cases of arbitrary bandwidth spectrum.Key TechnologyWrite Matlab general program, seeking arbitrary bandwidth of low-pass, high pass, bandpass Gauss white noise autocorrelation function, self covariance function and power spectral density function. Marked bandwidth, draw the original signal time-domain waveform and the function of the waveform chart.