Rh. Strandberg et al., EFFICIENT REALIZATIONS OF SQUARING CIRCUIT AND RECIPROCAL USED IN ADAPTIVE SAMPLE RATE NOTCH FILTERS, Journal of VLSI signal processing systems for signal, image, and video technology, 14(3), 1996, pp. 303-309
Citations number
6
Categorie Soggetti
Computer Sciences, Special Topics","Engineering, Eletrical & Electronic","Computer Science Information Systems
Adaptive sample rate filtering has been shown to be an efficient and e
ffective method of removing narrowband interference from broadband com
munication signals. The expression for the gradient for adaptive sampl
e rate filtering is expressed in terms of the traditional adaptive fil
ter gradient. Adaptive algorithms frequently use divide and square ope
rations. Rather than implementing a generic multiplier in the adaptive
section for the adaptive sample rate notch filter, we have developed
a technique of optimizing an implementation of the squarer. In the seq
uential reciprocal circuit presented, we show how a numerator (scaling
) can be easily incorporated into its design to achieve a general purp
ose divider. A Synopsis-synthesized VHDL description of a parallel rec
iprocal circuit is included for comparison. Both realizations have bee
n demonstrated in an adaptive sample rate notch filter which has been
downloaded into a single Xilinx XC4010 reconfigurable Field Programmab
le Gate Array (FPGA).