Research On Multi-domain United MIMO Communication Anti-jamming Technology Based On Direct Spread Space-time

With the rapid development of science and technology,information warfare has become an inevitable trend of military development.However,in military warfare,complex electromagnetic environment and enemy interference have a bad influence on the reliability of military communication systems.As the main wireless communication anti-jamming system in military communication field,spread spectrum communication has good anti-interception and anti-jamming performance.But with the continuous improvement of enemy interference intensity,traditional spread spectrum technology must have a breakthrough.So it is necessary to further study a new multi-domain united anti-jamming technology.Multiple input multiple output(MIMO)technology can greatly enhance the reliability of communication systems and suppress channel fading,so it can enhance the anti-jamming ability of communication systems.In view of the above research background,this paper starts the research on multi-domain united MIMO anti-jamming technology.This paper establishes the new Direct Spread Space-Time MIMO(DSST-MIMO)communication system and the Space-Time Direct Spread MIMO(STDS-MIMO)communication system.The Two systems are respectively based on the Direct Spread Space-Time(DSST)codec algorithm and the Space-Time Direct Spread(STDS)codec algorithm proposed in this paper.They can achieve information multi-domain united transmission in the spatial domain,time domain and power domain,and greatly enhance the anti-jamming ability of the communication system.The preliminary simulation of the communication system under the ideal channel can verify that the performance of the two communication systems is similar with antenna scale of two transmit one receive.But the STDS algorithm is more complicated than the DSST algorithm.And it can verify that compared with Space-time Block Code(STBC)and Direct Sequence Spread Spectrum(DSSS)communication system with antenna scale of two transmit one receive and four transmit four receive,the DSST-MIMO communication system has the significant superiority of anti-interference performance.In order to further verify the anti-jamming performance of DSST-MIMO communication system,this paper selects three kinds of typical interference of military communication(broadband interference,single-tone interference and pulse interference)and respectively adds them to the communication channel.The interference principle and the influence of different interference factors on the interference intensity are analyzed.The DSST-MIMO communication system with antenna scale of two transmit one receive and four transmit four receive is simulated to obtain signal-to-jamming ratio-bit error rate curve under the three kinds of interference.Compared with the STBC and the DSSS communication system,the superiority of the anti-jamming performance of the DSST-MIMO communication system is analyzed.The analysis results verify the anti-jamming performance of the multi-domain joint MIMO communication system is better.