Frequency Hopping Anti-jamming System Based On Cognitive Theory

The frequency hopping communication has good abilites of anti-jamming andanti-fading, also with the advantages of multiple access communications and high spectrumutilization. It can broad utilize in both civilian and military aspects, with the characteristics ofimproved anti-interference and intercepted, play an important role in the communicationsystem. Since the channel is open, a variety of interference in the transmission process willoccur, which can affect the quality of communication made communication cannot work.Meanwhile the ability of how to detect the interference signal and anti-jamming capability infrequency hopping communication is very important.After analysising the knowledge of the cognitive radio, uitilize cognitive radio spectrumsensing technology into presence signal detection, also combine with the frequency hoppingtechnique to detect the interference signal in the band of the frequency-hoppingcommunication. Studied the basic detection techniques of cognitive radio spectrum sensing,such as energy detection, loop detection. Simulated the experiments and summarized eachmethod advantages and disadvantages. Finally, designed frequency-hopping system based oncognitive radio, compared with the conventional frequency hopping communication system,cognitive radio frequency-hopping communication system which added spectrum sensingloop can detect hopping frequency set of the idle channel and tranmit hopping signal thoughspectrum sensing algorithm. In this situation, utilize frequency hopping systems based oncognitive radio into fading channel which has made the environment closer to the reality. Thesimulation results has shown, in the same conditions, frequency hopping systems based oncognitive error rate is less than the conventional frequency hopping systems, which hasproved the feasibility of this article.In this paper, based on the detection of interference, further analysised the high-speedfrequency hopping model in the hopping communication system. In military areas, frequencyhopping communication become more and more widely used, So in the military confrontation,it can interfere communications of the enemies, which can casue them communicationsfailure, in order to take advantage of the war.At the same time, detect during transmission, which can reduce the bit error rate. Thus,to solve this problem in a variety of channels, this paper made a simulation by taking use of bandwidth and multi-frequency interference and gave the comparison，in order to provide thereference for future analysis of communication anti-jamming.