Research on Variance-Based FCME Anti-Jaming Algorithm in Spaceborne OFDM System

In recent years, Chinese low-orbit satellite communication system has developed rapidly. As a mature waveform transmission technology, OFDM technology is widely used in low-orbit satellite communication systems with the advantages of outstanding resistance to inter-symbol interference, free spectrum and resource allocation, etc. However, for the spaceborne OFDM system, the transmission performance of the system will be seriously affected, whether it is in a civil scenario with unintentional interference or in a complex military confrontation environment with intentional interference. Anti-interference ability is an important factor to ensure the security and stability of the system. Aiming at the problem of narrowband interference in OFDM systems, this paper proposes a variance-based FCME anti-jamming algorithm, which adopts the frequency domain notch structure framework of DFT windowing and overlapping, and uses the variance-based FCME algorithm to detect and notch the interference in the frequency domain. Simulation shows that the algorithm can effectively resist single-tone interference, the bit error rate is lower than 10-6 when EbN0=12dB, and the system performance under narrowband interference can be effectively improved.