论文信息 - A modified coefficient decimation method to realize low complexity FIR filters with enhanced frequency response flexibility and passband resolution

A modified coefficient decimation method to realize low complexity FIR filters with enhanced frequency response flexibility and passband resolution

Low complexity, reconfigurable finite impulse response (FIR) filters using coefficient decimation method (CDM) has been recently proposed in literature. In this paper, we propose a modified coefficient decimation method (MCDM) which enhances the flexibility of CDM in obtaining FIR filters with varied passband locations. The resolution of the center frequency locations in the multi-band frequency responses obtained using MCDM is twice that of the conventional CDM. Further, the stopband attenuation of FIR filters realized using our MCDM is higher compared to the filters obtained using conventional CDM. Also, for the same prototype modal (original) filter, the number of distinct frequency band locations that can be obtained after coefficient decimation is greater for MCDM than CDM due to the increased center frequency resolution of the former method. The hardware realization architecture of MCDM is presented. The advantages of our method for realizing reconfigurable filter banks are also discussed.

A. Prasad Vinod | Abhishek Ambede | Kavallur Gopi Smitha

[1] Stephen A. Dyer,et al. Digital signal processing , 2018, 8th International Multitopic Conference, 2004. Proceedings of INMIC 2004..

[2] A. Prasad Vinod,et al. Low complexity flexible filter banks for uniform and non-uniform channelisation in software radios using coefficient decimation , 2011, IET Circuits Devices Syst..

[3] Yong Lian,et al. Frequency-response masking approach for digital filter design: complexity reduction via masking filter factorization , 1994 .

[4] A. Prasad Vinod,et al. Coefficient decimation approach for realizing reconfigurable finite impulse response filters , 2008, 2008 IEEE International Symposium on Circuits and Systems.

[5] K.R. Pai,et al. Modified linear phase frequency response masking FIR filter , 2005, ISPA 2005. Proceedings of the 4th International Symposium on Image and Signal Processing and Analysis, 2005..

[6] Yong Ching Lim,et al. Frequency-response masking approach for the synthesis of sharp linear phase digital filters , 1986 .

[7] Tzi-Dar Chiueh,et al. A Low-Power Digit-Based Reconfigurable FIR Filter , 2006, IEEE Transactions on Circuits and Systems II: Express Briefs.

[8] A. Prasad Vinod,et al. A new low power reconfigurable decimation-interpolation and masking based filter architecture for channel adaptation in cognitive radio handsets , 2009, Phys. Commun..