Design of Narrowband Interference Suppressor for Pulse Signal Detection

This paper analyzes narrowband interference suppression using temporal and frequency processing techniques for pulse signal detection.We implement a stand-alone interference suppressor on field programmable gate array (FPGA) based on digital tuning and 1st-order notch filtering.When a pulse signal along with narrowband interference is detected through spectral measurements, the interference signal is translated to zero frequency using down-converter and filtered out by a simple high-pass infinite impulse response (IIR) .The original pulse signal is translated to its previous frequency using corresponding up-converter after alleviating the effects of interference.Furthermore, we deduce the frequency interval between pulse signal and narrowband interference to satisfy interference suppression performance.Experimental results show that the proposed interference suppressor can reduce narrowband interference effect and detect pulse signal under acceptable root mean square (RMS) value.