Adaptive subband Notch Filter for RFI cancellation in low interference to signal ratio

In this paper, an adaptive-subband-based Radio Frequency Interference (RFI) cancellation method for VDSL systems is developed. The use of subband adaptive IIR notch filter with a specific developed excision algorithm offers a solution in low Interference to Signal Ratio (ISR) environment. The division of a fullband problem into several subbands improves the tracking ability of the Fullband Adaptive Notch Filter (FANF) in low ISR, since the noise variance is reduced in each subband and offers faster convergence speed, due to decimation. In this paper, we compare the performances of the subband method with the classical fullband method using the normalized-stochastic-algorithm-based IIR Adaptive Notch Filter (ANF).