三种频移键控调制解调算法的仿真性能研究

Research on Simulation Performance of Three Frequency Shift Keying Modulation and Demodulation Algorithms

CPFSK调制产生的方法是用数字基带去调制单频率载波,使得信息绝大部分能量集中在主瓣带宽,采用的是连续相位频率调制;因此,通过MATLAB绘制仿真调制与解调图、频谱图、蒙特卡洛误码率仿真图,在频域上验证带宽的理论特性;研究结果表明,MSK的正交调制法将优于2FSK和2CPFSK,而多进制时FSK和CPFSK则基本一致,最后对二进制仿真与多进制仿真的误码率进行比较,从而评估了频移键控的可靠性。

The method of the CPFSK modulation is to modulate the single-frequency carrier with the digital baseband so that the majority of the information is concentrated in the main lobe bandwidth, which uses continuous phase frequency modulation. Therefore, the simulation modulation and demodulation diagram, spectrum diagram and Monte Carlo bit error rate simulation diagram are drawn by MATLAB to verify the theoretical characteristics of bandwidth in frequency domain. The results show that the orthogonal modulation method of MSK is better than that of 2 FSK and 2 CPFSK, while FSK and CPFSK are basically the same in binary system.