5G NR OFDM multi numerologies interference mitigation

Abstract

This work examines the importance of multi-numerologies in fifth-generation (5G) using orthogonal frequency-division multiplexing (OFDM). The impact of multi-numerologies on coexistence issues, latency, and spectrum efficiency is highlighted in this work. A discussion of potential future research directions following a comparative study of previous efforts is also presented. The proposed work presented 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-offs. The hybrid ZP-WOLA mitigation approach reached a 78% - 91% BER reduction percentage across the 0 - 30 dB SNR range in the ideal case (under AWGN), while under moderate flat Rayleigh fading it achieved BER reductions of 37% - 72% over the same range.