Comparative Study of Dynamic TDD with Full-Duplex in Cell-Free Massive MIMO Systems

Chowdhury, A and Murthy, CR (2023) Comparative Study of Dynamic TDD with Full-Duplex in Cell-Free Massive MIMO Systems. In: 2023 National Conference on Communications, NCC 2023, 23 - 26 February 2023, Guwahati.

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Abstract

In this paper, we present a comparative study of the performance of a dynamic time division duplex (DTDD) enabled cell free massive multiple-input multiple-output (CF-mMIMO) with a full-duplex (FD)CF-mMIMO system. Both DTDD and FD enable a CF-system to serve uplink (UL) and downlink (DL) user equipments (UEs) simultaneously over the same time-frequency resources. However, interference from other access points (APs) affects the performance of both of these duplexing strategies. Additionally, the intra-AP self-interference suppression level has a significant impact on the sum UL-DL spectral efficiency (SE) of an FD CF-system. On the other hand, in DTDD, concurrent UL/DL reception/transmission is facilitated by judiciously apportioning the UL and DL time slots across half-duplex APs based on the localized UL/DL traffic load. Due to this, DTDD obviates the need for intra-AP interference cancelation. Our numerical experiments reveal that the achievable sum SE with DTDD can match, and even outperform, an FD system with similar antenna density. Thus, DTDD is a potential duplexing scheme that can be incorporated in the next generation wireless systems to serve concurrent UL-DL traffic load without the need for implementing complex hardware and algorithms for self-interference cancelation as in FD systems.

Item Type:	Conference Paper
Publication:	2023 National Conference on Communications, NCC 2023
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:	Antennas; Finite difference method; Spectrum efficiency; Time division multiplexing, Access points; Cell-free; Cell-free massive MIMO; Comparatives studies; Duplexing; Dynamic TDD; Dynamic time; Full-duplex; Performance; Time division duplex, MIMO systems
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	24 May 2023 03:58
Last Modified:	24 May 2023 03:58
URI:	https://eprints.iisc.ac.in/id/eprint/81529

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