Modified Filter Bank for Digital Down Converter of Pulse Radar Receiver

Abstract: In Pulse radar receiver system Digital down converter is an important part. Digital down converter (DDC) demodulates the base band signal from the transmitted signal and also reduces the sampling rate of the signal. The most important part of DDC is filter structure, it uses large resources which increases the cost of the system. To overcome this problem we propose the new filter structure containing the cascade integrator combo filter (CIC filter), multi-rate FIR filter and Half-band filter. The proposed filter structure of DDC reduces the complexity and cost of implementation. The simulation results shows that the proposed filter structure of DDC achieves expected specification in application of pulsed radar receiver.

Keywords: Digital Down Converter (DDC); Cascade Integrator Combo Filter (CIC); Finite Impulse Response (FIR); Half Band Filter (HB filter); Analog To Digital Converter (ADC)