EFFICIENT REALIZATIONS OF SQUARING CIRCUIT AND RECIPROCAL USED IN ADAPTIVE SAMPLE RATE NOTCH FILTERS

Citation
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
ISSN journal
13875485
Volume
14
Issue
3
Year of publication
1996
Pages
303 - 309
Database
ISI
SICI code
1387-5485(1996)14:3<303:EROSCA>2.0.ZU;2-1
Abstract
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).