Implementation of narrow-band frequency-response masking for efficient narrow transition band FIR filters on FPGAs

The complexity of narrow transition band FIR filters is high and can be reduced by using frequency response masking (FRM) techniques. These techniques use a combination of periodic model filters and masking filters. In this paper, we show that time-multiplexed FRM filters achieve lower complexity, not only in terms of multipliers, but also logic elements compared to time-multiplexed single stage filters. The reduced complexity also leads to a lower power consumption. Furthermore, we show that the optimal period of the model filter is dependent on the time-multiplexing factor.