Suppression of radio frequency interferences using the adaptive FIR filter based on the Linear Prediction

The Linear Predictor (LP) is a finite impulse response adaptive filter using linear prediction to suppress radio frequency interferences (RFI) in the Auger Engineering Radio Array (AERA). AERA focus on the electromagnetic part of the Extensive Air Showers. The electromagnetic part of the shower produces radio signals in geomagnetic radiation and charge excess processes. Due to the reflection of the atmosphere AERA radio stations can observe these signals in the frequency band 30 - 80 MHz. This frequency range is contaminated by narrow-band and other human-made RFI. To suppress these contaminations AERA uses two kind of filters: the Median filter and the infinite impulse response - notch filter, however both of them have disadvantages. LP is a new approach in real-time signal filtering. Laboratory and pampas tests show fast adaptation, acceptable power consumption and very good efficiency of the LP filter.