Anti-Jamming Performance Analysis of OFDM Systems Based on Optimized Communication Channel Model

The application of OFDM technology in the field of low-orbit satellite communication gradually begins to become a reality, and as an open resource, the security of the satellite communication system may be seriously threatened. For the anti-jamming problem of OFDM system in LEO satellite communication, a satellite communication downlink model under the optimized communication channel is established, and the anti-jamming performance of the system under the jamming environment is analyzed and compared through Monte Carlo simulation experiments, with the bit error rate gain as the evaluation index. The effects of signal-to-noise ratio conditions, error control combinations and modulation mapping methods on the system anti-jamming performance are further discussed. The experimental results show that the OFDM system is vulnerable under complex jamming and deep fading channel, the type of jamming and channel characteristics jointly affect the system communication performance, and the critical impact of the anti-jamming method settings at the transmitter side of the system varies in different jamming environments. The experimental conclusions and analysis provide some guiding basis for the transmission reliability design of LEO satellite communication OFDM system under different jamming scenarios.