Inter-Numerology Interference Pre-Equalization for 5G Mixed-Numerology Communications

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Cevikgibi B. A., Demirtas A. M., Girici T., ARSLAN H.

95th IEEE Vehicular Technology Conference - Spring, VTC 2022-Spring, Helsinki, Finland, 19 - 22 June 2022, vol.2022-June, (Full Text) identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 2022-June
  • Doi Number: 10.1109/vtc2022-spring54318.2022.9860604
  • City: Helsinki
  • Country: Finland
  • Keywords: 5G NR, Inter-Numerology Interference, Mixed Numerology, OFDM
  • Istanbul Medipol University Affiliated: Yes

Abstract

This article proposes a pre-equalization method to remove inter-numerology interference (INI) that occurs in multi-numerology OFDM frame structures of fifth-generation New Radio (5G-NR) and beyond, on the transmitter side. In the literature, guard bands, filters, and interference cancellation methods are used to reduce the INI. In this work, we mathematically model how the INI is generated and show how it can be removed completely for multi-numerology systems by deploying a pre-equalization matrix on the transmitter side. With this pre-equalization method, the need for guard bands and filters is eliminated and spectral efficiency is improved.