A blind source separation-based anti-jamming method by space pre-whitening

A blind source separation-based anti-jamming method for frequency hopping (FH) communication is proposed in this paper by space pre-whitening. Aiming at short-time stationarity of the FH signal and non-vanishing time correlation of the colored noise, the impact of colored noise is weaken through space pre-whitening by using joint difference correlation matrix established in the selected characteristic window. Then, in order to achieve the purpose of anti-jamming, the communication signal and the jamming are separated by joint approximate diagonalization of time-delayed autocorrelation matrix set obtained in a series of characteristic windows. Simulation results show that the new algorithm has better separation effect and lower bit error rate (BER) than the JADE or fast ICA algorithm under the condition of low normalized signal to noise ratio (NSNR).