Improved CIC Decimation Filter on Software Defined Radio
Chenghui Gan, Xuemei Li · 2021
CIC filter is an efficient decimation or interpolation filter and has been proved to be suitable for high sampling rate applications. High passband distortion and low stopband attenuation are the two major disadvantages of CIC filter. In order to meet the application and development requirements of CIC decimation filter in the software radio system, a solution to improve CIC decimation filter is proposed. By introducing Cosine filter and Gain compensator to optimize the passband and stopband performance, the simulation results show that the design method improves the stopband attenuation by 29dB compared with the traditional CIC filter, and the passband characteristics are better improved.