Multi-Frequency Interference Detection and Mitigation Using Multiple Adaptive IIR Notch Filter with Lattice Structure

Abstract

Radio Frequency Interferences (RFI), such as strong Continuous Wave Interferences (CWI), can influence the Quality of Service (QoS) of communications, increasing the Bit Error Rate (BER) and decreasing the Signal-to-Noise Ratio (SNR) in any wireless transmission, including in a Digital Video Broadcasting (DVB-S2) receiver. Therefore, this paper presents an algorithm for detecting and mitigating a Multi-tone Continuous Wave Interference (MCWI) using a Multiple Adaptive Notch Filter (MANF), based on the lattice form structure. The Adaptive Notch Filter (ANF) is constructed using the secondorder IIR NF. The approach consists in developing a robust low-complexity algorithm for removing unknown MCWI. The MANF model is a multistage model, with each stage consisting of two ANFs: the adaptive IIR notch filter

Comparing the Performances between Adaptive Notch Filter Direct and Lattice Forms Structures for Mitigation Jamming Signals

“…These approaches totally eliminate jamming, but they generate a self-noise, which causes distortion and loss of some useful signals. To limit the loss and distortion of useful signals while eliminating jamming, we present a low-complexity algorithm approach for both direct and lattice IIR NF forms structure based on a second-order NF to mitigate CW and MCW interferences and adjust notch depth and compare between two structures, which has not been studied in previous works-particularly [18] [36] [37] [38]. Furthermore, based on the comparison of the two structures and the results derived by MATLAB® Simulation, we observed that the lattice IIR NF structure achieves better performance than the direct IIR NF structure for detecting and removing jamming.…”

Single and Multiple Continuous-Wave Interference Suppression Using Adaptive IIR Notch Filters Based on Direct-Form Structure in a QPSK Communication System

“…In GPS, ref. [42] proposed a method to mitigate CWI using adaptive FIR and ACM filters, while [43] proposed a method based on the lattice-form structure for detecting and mitigating an MCWI by controlling the depth of the NF.…”

“…To reduce and mitigate CWI, [41] presented a new low-complexity anti-jamming NF for general wireless communications, while [42] derived FIR excision filters that optimize receiver SNR for NB interference. In GPS, [42] proposed a method to mitigate CWI using adaptive FIR and ACM filters, while [43] proposed a method based on the lattice-form structure for detecting and mitigating an MCWI by controlling the depth of the NF.…”