A single-input Narrow-band Interference Suppression and Smoothing Algorithm Based on LMS Filter

Narrow-band interference should be cancelled or communication reliability will be destroyed. A single-input narrow-band interference suppression and smoothing algorithm based on LMS filter are proposed for the flaw of traditional LMS algorithm when frequency of NBI is low. Firstly the interfered signal is copied and pre-processed. Then most power of NBI is supperessed by LMS filter, and difference value between output and expected response is obtained. Finally the difference value sequence is smoothed in order to suppress low-frequency NBI further. Simulation results show that NBI could be suppressed with the algorithm, and particularly low-frequency NBI can be restrained, which means better SIR for receiving end and higher communication quality is provided.