LFM interference suppression in FRFT domain based on hypothesis testing

Refering to the problem that it is difficult to set the exact threshold of LFM interference suppression in FRFT domain, the defect of fixed threshold algorithm and adaptive threshold algorithm is analyzed. Under the condition that only the direct sequence spread spectrum signal and additive Gaussian noise are present at the receiver, the amplitude of received signal after FRFT is assumed to be Rayleigh distributed. Based on the distribution characteristics, a novel LFM interference suppression algorithm based on hypothesis testing is proposed. The simulation results show the validity of the algorithm.