Interference Analysis in Multi-Numerology OFDM Systems: A Continuous-Time Approach

Mao, J., Farhang, A., Zhang, L. , Chu, Z., Xiao, P. and Gu, S. (2021) Interference Analysis in Multi-Numerology OFDM Systems: A Continuous-Time Approach. In: IEEE ICC 2021-Workshops, 14-18 Jun 2021, ISBN 9781728194424 (doi: 10.1109/ICCWorkshops50388.2021.9473482)

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Multi-numerology multi-carrier (MN-MC) techniques are considered as essential enablers for RAN slicing in fifth-generation (5G) communication systems and beyond. However, utilization of mixed numerologies breaks the orthogonality principle defined for single-numerology orthogonal frequency division multiplexing (SN-OFDM) systems with a unified subcarrier spacing. This leads to interference between different numerologies, i.e., inter-numerology interference (INI). This paper develops metrics to quantify the level of the INI using a continuous-time approach. The derived analytical expressions of INI in terms of mean square error (MSE) and error vector magnitude (EVM) directly reveal the main contributing factors to INI, which can not be shown explicitly in a matrix form INI based on discrete-time calculations. Moreover, the study of power offset between different numerologies shows a significant impact on INI, especially for high order modulation schemes. The finding in this paper provides analytical guidance in designing multi-numerology (MN) systems, for instance, developing resource allocation schemes and interference mitigation techniques.

Item Type:Conference Proceedings
Additional Information:This work was supported by the U.K. Engineering and Physical Sciences Research Council under Grant EP/R001588/1.
Glasgow Author(s) Enlighten ID:Zhang, Professor Lei
Authors: Mao, J., Farhang, A., Zhang, L., Chu, Z., Xiao, P., and Gu, S.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Copyright Holders:Copyright © 2021 IEEE
First Published:First published in Proceedings of 2021 IEEE International Conference on Communications Workshops (ICC Workshops)
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher
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