Narrow-band interference suppression in DSSS using dual-threshold algorithm

This paper proposes an improved dual-threshold interference suppression (IS) algorithm for suppressing the narrow-band interference in the spread spectrum system. The proposed algorithm utilizes the spectral characteristics of direct sequence spread spectrum (DSSS) signal and BPSK modulation. It exploits the symmetry of PN-BPSK signal to obtain a better estimate of the spectrum and sets a limit threshold to protect the main lobe of the signal spectrum. In addition, the algorithm utilizes the segmented power statistics method to reduce the computational complexity. Compared with the conventional methods, the proposed algorithm has better anti-interference performance and requests lower computational burden. Simulation results verify the effectiveness of the proposed algorithm.