多进制频率调制信号抗干扰性能建模与分析

针对模拟调制已不能满足当今军事通信的需要的问题，建立一种通信系统模型和宽带高斯噪声、窄带噪声、调频和音调等干扰样式模型。分析了MFSK信号调制和解调的特点，并在基于非相干解调情况下，以M=8为例，分析了5种干扰样式情况下的理论误码率，并通过仿真得出了各种干扰样式对MFSK信号的干扰效果。仿真结果表明：在相同数据速率的情况下，多音干扰和噪声调频2种干扰信号的干扰效果最好，单音和窄带干扰次之，宽带高斯噪声最差，为进一步研究干扰技术和干扰效果提供了参考。

Anti-Jamming Performance of MFSK Signal Modeling and Analysis

Aiming at the problem that analogue modulation method can’t meet the needs of military communication nowadays, this paper establishes a model of MFSK communication system and five jamming samples models (wide-band gauss noises, narrow-band noises, FM, tone). After discussing the characteristics of MFSK demodulation signal, this paper takes M=8 for example and analyzes the theoretical error rates under various jamming simples based on incoherent demodulation, then gives jamming effects of five jamming simples to MFSK signal by mathematic simulation. The simulation results show that among the interference effects in the same data rate, the multi-tone and FM occupy the first place, single-tone and narrow-band noises come secondly, and wide-band gauss is the worst, which provides valuable reference for the further study of jamming technology and effects in external field.