5G New Radio OFDM Multi-Numerology Interference Mitigation

This work examines the importance of inter-numerology interference mitigation in fifth-generation (5G) NR orthogonal frequency-division multiplexing (OFDM) based systems. The impact of multi-numerology on coexistence issues, latency, and performance is highlighted in this work. The proposed work is a hybrid mitigation approach that combines time domain mitigation by zero padding WOLA filtering and frequency domain mitigation using a fixed guard-band. The work discusses each case separately, then combines them and studies the overall improvements and the possible trade-off. The hybrid ZP WOLA mitigation approach reached 78% - 91% BER reduction percentage in the ideal case (under AWGN) and 37% - 72% BER reduction percentage under moderate fading (flat Rayleigh fading).