Multicarrier-Division Duplex: A Duplexing Technique for Shift to 6G Wireless Communications

Abstract

In-band full-duplex (IBFD) has the potential to not only double the spectral efficiency (SE) but also greatly reduce the transmission latency. However, the less maturity of existing self-interference cancellation (SIC) techniques renders IBFD impractical for future wireless applications. To inherit the merits of full-duplex (FD) but with practical SIC requirements, multicarrier-division duplex (MDD) was proposed and studied recently. In this article, we demonstrate the advantages of MDD over the IBFD mode and the conventional half-duplex (HD) modes of frequency-division duplex (FDD) and time-division duplex (TDD) from several essential aspects, including SIC capability, resource integration and the support for high-mobility communications. Several numerical results are included to show that MDD outperforms IBFD in terms of energy efficiency and SIC. Compared with the HD modes, MDD is capable of efficiently integrating the DL/UL resources to achieve higher SE and significantly outperforms TDD, when communicating over fast time-varying channels. Lastly, some implementation challenges of MDD systems are discussed.

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Identifiers

ORCID for Bohan Li: orcid.org/0000-0001-7686-8605

ORCID for Lie-Liang Yang: orcid.org/0000-0002-2032-9327

ORCID for Robert Maunder: orcid.org/0000-0002-7944-2615

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