Research on Anti-interference Performance of MIMO-OFDM System Communication

In this paper, for the anti-interference problem of communication in the field of electronic countermeasures, the anti-jamming performance of MIMO-OFDM system communication is analyzed. Firstly, the MIMO system is introduced. It is proved through the formula deduction that the MIMO technology improves the channel capacity of the system. Secondly, the working principle of MIMO-OFDM is analyzed, and its system structure and anti-jamming performance are explored. Finally, the channel capacity of different MIMO systems and the anti-jamming performance of MIMO-OFDM system communication are simulated and analyzed. The simulation results show that with the increase of the number of antennas, the channel capacity is obviously increased, which is conducive to the stability of communication. Compared with a single MIMO system or OFDM system, a MIMO-OFDM system has a lower error rate and more excellent anti-interference performance under the same noise interference. Finally, the effect of the LS and LMMSE two channel estimation algorithms on the system performance is simulated. The results show that the LMMSE algorithm has better performance and can effectively improve the system performance.