基于边带相关算法的时频调制解调技术的研究

摘要

Time-frequency shift keying (TFSK) has been applied in wireless laser communication because of its good characteristic of resistance to frequency selective declination. This paper introduces a new method of modulation and demodulation. Using the correlation of signals, the carrier frequency of the signal can be found firstly on the basis of the theory of side-correlation algorithm, and then the original signal can be demodulated according to TFSK' s carrier sequence. This method is proved to be feasible based on MATLAB, the BER curve is also given. It provides reference for the design of modulation and demodulation in the wireless laser communication system.%时频调制技术(TFSK)由于其良好的抗频率选择性衰落的特性而被应用于无线激光通信中.文中介绍了一种新调制解调方法,即利用信号的相关性,依据边带相关算法分析出信号的载波频率,再根据TFSK的调制载波的频率顺序,还原出原始信号.以Matlab作为仿真平台,验证了此方法的可行性,并计算出了误码率曲线.为无线激光通信中调制解调系统的设计提供了参考.