A novel narrow-band interference suppression scheme in GNSS receivers

This paper presents a novel design method for Modulated Lapped Biorthogonal Transform (MLBT) and develops the narrow-band interference suppression scheme based on it for GNSS receivers. The proposed design method not only satisfies Perfect Reconstruction (PR) condition of the transmitted signal, but also leads the prototype filter of MLBT´s forward transform to be designed freely, so higher sidelobe attenuation can be achieved, e.g. 92dB. Simulation results show that performance of the new scheme is apparently better than the schemes based on MLT and Matviyenko-MLBT, and approaches the scheme based on overlapped and windowed DFT if the same transform length is assumed. Moreover, it has a lower computation complexity as compared with the scheme based on overlapped and windowed DFT.