An Improved Modified Coefficient Decimation Method to Realize Low Complexity Reconfigurable Fir Filters For Cognitive Radio
Designing a low complexity reconfigurable finite impulse response (FIR) filters is a crucial task in signal processing. The coefficient decimation method (CDM) has been recently suggested as the most efficient method for designing finite impulse response (FIR) filters with flexible frequency responses. In this paper, an improved modified coefficient decimation method (IMCDM) is proposed to enhance the flexibility of convention MCDM in realizing FIR filters with different pass-band locations. Computer simulation results show that the multi-band frequency response obtained using IMCDM improves the frequency resolution as that of the conventional method (MCDM). Furthermore, the IMCDM method realizes FIR filters with higher stop-band attenuation than the filters obtained using the MCDM technique. A simulation result of the proposed method indicates 6.3 % reduction in number of multiplication when compared to MCDM. The advantage of our proposed technique for realizing reconfigurable FIR filter is discussed.