预先设定载频、采样率、码速率、信息代码个数和信噪比等参数，进行FSK信号的调制解调。-Pre-set carrier frequency, sampling rate, bit rate, information, code number and signal to noise ratio and other parameters for FSK signal modulation and demodulation.

试设计一个切比雪夫I型高通数字滤波器，采样率为8000Hz,fp=1000Hz,fs=700Hz,Rp=3dB,Rs=20dB。-Try to design a type I Chebyshev high-pass digital filter sampling rate of 8000Hz, fp = 1000Hz, fs = 700Hz, Rp = 3dB, Rs = 20dB.

几个有关通信系统的matlab程序,有关信号，包含：a,对抽样频率为90kHz的信号进行下抽样抗混叠滤波器设计的程序，b,信号抽样率转换的程序，c,通过补零内插对信号进行下抽样，分析抽样对信号频谱的影响的程序-Some matlab programs about communiction system,mainly about signal,a,program about filter to signal sampling without aliasing ,b,transfering sign