Adaptive cyclostationary filtering for DGPS interference cancellation

LEANDRO SCHLAIN; GUSTAVO J. GONZÁLEZ; FERNANDO H. GREGORIO; JUAN E. COUSSEAU

Córdoba

Conferencia; XVI Reunión de Trabajo en Procesamiento de la Información y Control - RPIC 2015; 2015

Facultad de Ciencias Exactas, Físicas y Naturales de la Universidad Nacional de Córdoba y la Universidad Tecnológica Nacional, Facultad Regional Córdoba

In this work it is introduced a scheme to reduce theeffects of a differential GPS signal when acting as interferencein narrowband powerline communications systems. The noveltyis the use of specific cyclostationary characteristics of the interferingsignal for its cancellation. A robust detection method (theforward consecutive mean excision algorithm) is used to defineif the interfering signal is present. As a second step, when theinterference is detected, two alternatives are considered: simplesubcarrier notching, on one side or, adaptive frequency shiftfiltering. The latter alternative uses the known parameters ofthe interference signal, i.e., differential GPS, in particular itscyclostationarity.We compare results and demonstrate that adaptivefrequency shift filtering outperforms subcarrier notching,especially when the interferer power is high.