Inter-Numerology Interference in 5G New Radio: Analysis and Bounds for Time-Varying Fading Channels

Sreedhar, TVS and Mehta, NB (2022) Inter-Numerology Interference in 5G New Radio: Analysis and Bounds for Time-Varying Fading Channels. In: 2022 IEEE International Conference on Communications, ICC 2022, 16 - 20 May 2022, Seoul, pp. 4818-4823.

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Abstract

Mixed numerology is a new feature of the orthogonal frequency division multiplexing-based physical layer of 5G new radio (NR). It enables 5G to serve diverse use cases and services. However, the subcarriers of different numerologies, despite being non-overlapping in frequency, interfere with each other due to their different bandwidths and symbol durations. We derive novel expressions for the fading-averaged INI power at each subcarrier of a numerology in a wideband time-varying channel. These expressions cover the general family of numerologies of 5G NR, account for the guard band (which is used to mitigate INI), and apply to line-of-sight (LoS) and non-LoS channels. These lead to insightful expressions and tight bounds for the bandwidth-averaged INI power. They reveal that the INI power increases quadratically with the Doppler spread of the channel and affects higher-rate modulation and coding schemes.

Item Type:	Conference Paper
Publication:	IEEE International Conference on Communications
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	5G mobile communication systems; Fading (radio); Fading channels; Network layers; Radio interference; Time varying networks, Guard-band; Line of Sight; Orthogonal frequency-division multiplexing; Physical layers; Power; Sub-carriers; Symbol duration; Time varying channel; Time varying fading channels; Wide-band, Bandwidth
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	05 Oct 2022 07:37
Last Modified:	05 Oct 2022 07:37
URI:	https://eprints.iisc.ac.in/id/eprint/77046

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