How to combine OTFS and OFDM modulations in massive MIMO?

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Abstract

In this paper, we consider a downlink (DL) massive multiple-input multiple-output (MIMO) system, where different users have different mobility profiles. To support this system, we propose to use a hybrid orthogonal time frequency space (OTFS)/orthogonal frequency division multiplexing (OFDM) modulation scheme, where OTFS is applied for high-mobility users and OFDM is used for low-mobility users. Two precoding designs, namely full zero-forcing (FZF) precoding and partial zero-forcing (PZF) precoding, are considered and analyzed in terms of per-user spectral efficiency (SE). With FZF, interference among users is totally eliminated at the cost of high computational complexity, while PZF can be used to provide a trade-off between complexity and performance. To apply PZF precoding, users are grouped into two disjoint groups according to their mobility profile or channel gain. Then, zero-forcing (ZF) is utilized for high-mobility or strong channel gain users to completely cancel the inter-group interference, while maximum ratio transmission (MRT) is applied for low-mobility users or users with weak channel gain. To shed light on the system performance, the SE for high-mobility and low-mobility users with a minimum-mean-square-error (MMSE)-successive interference cancellation (SIC) detector is investigated. Our numerical results reveal that the PZF precoding with channel gain grouping can guarantee a similar quality of service for all users. In addition, with mobility-based grouping, the hybrid OTFS/OFDM modulation outperforms the conventional OFDM modulation for high-mobility users.

Original languageEnglish
Title of host publicationProceedings of the IEEE Conference on Global Communications, GLOBECOM 2023
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages6
ISBN (Electronic)9798350310900
ISBN (Print)9798350310917
DOIs
Publication statusPublished - 26 Feb 2024
EventIEEE Global Communications Conference 2023 - Kuala Lumpur, Malaysia
Duration: 04 Dec 202308 Dec 2023
https://globecom2023.ieee-globecom.org/

Publication series

NameGLOBECOM Proceedings
ISSN (Print)1930-529X
ISSN (Electronic)2576-6813

Conference

ConferenceIEEE Global Communications Conference 2023
Abbreviated titleGLOBECOM 2023
Country/TerritoryMalaysia
CityKuala Lumpur
Period04/12/202308/12/2023
Internet address

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