A New Algorithm of Narrow-Band Interference Excision in Lapped Transforms Domain

In order to further mitigate the great narrow-band interference (NBI) in direct sequence spread spectrum (DSSS) communications, a new algorithm is suggested to suppress NBI in lapped transforms (LT) domain. At first the gross threshold is used to remove the coefficients of the big jamming. Then median filter (MF) algorithm is used to reject the residual coefficients of jamming. And through compare both of them to judge whether the coefficients through gross threshold replace by the coefficients through MF in LT domain to reduce the distortion of the useful information. The simulation results demonstrate that the proposed algorithm is far reduce the energy of jamming, and also improve the system performance and increased robustness