Narrow-Band Interference Removing Filter for Mobile Communication Systems

In wireless communication systems, the received signal is often distorted by narrow-band interference (NBI). Notch filter is commonly used for removing NBI. In this paper, we propose NBI removing filter, which is composed of two mixers and one high pass filter (HPF) to enhance the receiver performance in high NBI environment. Using two mixers and one high pass filter, the NBI can be removed by down-converting the received signal wherever the NBI is located.