Research And Simulation On Anti-jamming Performance Of Frequency-Hopping Communication System

Frequency-hopping (FH) technique has high ability of anti-interference and anti-fading. Besides, it works well together with the narrow-band communication system. As a result, Frequency-hopping technique has been widely used to prevent and reduce interference in the field of tactics communications. The project that"Research on estimation of anti-jamming performance in'human-in-the-loop'data link for the guidance systems based on image", which includes analysis of anti-jamming performance of different communication systems, mainly discusses the effect of jamming on transformation link for image and instruction. Based on the project, theoretical analysis and simulation on anti-jamming performance of FH communication system were shown in this paper.This thesis introduces FH communication principle including structure, mathematic model, primary technical parameters, besides the two of key technique, including the design of the frequency-hopping pattern and the synchronization of FH communication system. It also presents the difference between FH and direct-sequence spread-spectrum communication system. Especially, anti-jamming performances are analyzed and simulated. It concludes the effect which makes to FH communication system from typical jamming on the theoretical point, including full-band noise jamming, partial-band noise jamming, multiple frequency jamming and track jamming. Moreover, bit-error-rate (BER) calculations of FH/MFSK system are presented under above jamming conditions. The simulation model of FH communication system is built on the Matlab/Simulink software platform and a channel model is built which contains all above jamming. BER-SNR curve figures are presented under above jamming conditions as changing the parameters of the channel mode and validate the theory analysis.