SUPPRESSION OF MULTIPLE NARROW-BAND INTERFERENCE USING REAL-TIME ADAPTIVE NOTCH FILTERS

The process of detection of narrow-band interference to a broad-band s ignal in a noisy environment using adaptive filtering techniques attri butable to Kwan and Martin is further refined by modifying the gradien t-search algorithm to reduce hardware complexity. The Kwan and Martin algorithm implies a geometric increase in hardware as the number of in terferers increases. The improved method admits to only an arithmetic increase to achieve the similar results. Thus Kwan and Martin filters designed to handle 3 to 10 notches require 12.5% to 124% more hardware than the new filters. Simulations of the new method show it to be rob ust, functioning well in a variety of practical signal processing appl ications.