Anti-jamming algorithm for spread spectrum communication using blind source separation

An improved anti-jamming algorithm for spread spectrum communication based on blind source separation (BSS) is proposed to solve the problem that the separation performance of BSS technology deteriorates at a low signal-to-noise ratio (SNR), especially at the threshold SNR of spread spectrum communication. First, the algorithm detects the ambiguity of the output of the blind source separation algorithm, and then uses the detection result to correct the separation matrix. Finally, the new separation matrix is obtained by accumulating a plurality of modified matrices, and applied to the jamming separation of the system. The algorithm has a simple structure and can realize anti-jamming communication of the spread spectrum system at the demodulation threshold. Simulation results show that the demodulation error performance of the communication signal after removing the jamming by the algorithm at a negative SNR is still close to the theoretical performance.