A Reconfigurable High-Speed RNS-FIR Channel Filter for Multi-Standard Software Radio Receivers

This paper presents a reconfigurable, high-speed channel filter architecture for multi-standard Software defined radio (SDR) receivers using Residue number systems (RNS). The channel filters in the channelizer of an SDR extract multiple narrowband channels corresponding to different communication standards from the wideband input signal. These filters must operate at the highest speed in the digital front-end as it is placed immediately after the ADC. For a given moduli set, our architecture can be reconfigured for multiple standards with varying number of taps. The proposed architecture has been synthesized on TSMC 0.18 mu m CMOS standard cell technology. Synthesis result shows that the proposed reconfigurable FIR channel filter offers speed improvement of 72.6% at the cost of 12% increase in area compared to existing method. The Area-Time complexity of our architecture is 68.9% less than that of the existing method.