An ICA based antijamming method for frequency hopping communications with time and frequency information

According to the independence between the jamming signal and the frequency hopping (FH) signal a novel independent component analysis (ICA) based antijamming method is proposed in this paper. When FH operates in peer to peer mode, two antennas are introduced at the receiver end. Firstly, two received signal are processed by ICA. From the blind separation between the FH signal and the jamming signal, the antijamming ability of FH communications is improved greatly. Then the information sequence is recovered by traditional demodulation. Compared with interception, the receiver has some useful prior information. So the time and frequency information of FH communications are utilized during the separation as the form of prefilter. Simulation results indicate the separation with prior information can improve the bit error ratio performance of FH communications better.