uwb基础源码，包括uwb信号产生、各种调制方法、信号功率谱密度频谱特性、以及信道仿真等。-uwb basis of source, including uwb signal generator, various modulation methods, the signal power spectral density spectrum, and channel simulation.

用于计算待测信号的功率谱密度，方法是通过计算自相关函数的傅立叶变换。-Used to calculate the power spectral density of the test signal, the method by calculating the autocorrelation function of the Fourier transform.