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Ten Years of Research Advances in Full-Duplex Massive MIMO

Mohammadali Mohammadi, Zahra Mobini, Hien Quoc Ngo, Michail Matthaiou

TL;DR

An overview of ongoing research endeavors focused on in-band full-duplex (IBFD) massive multiple-input multiple-output (MIMO) systems and their applications and the emerging paradigm of network-assisted IBFD CF-mMIMO (NAFD CF-mMIMO), serving as an energy-efficient prototype for asymmetric uplink and downlink communication services.

Abstract

We present an overview of ongoing research endeavors focused on in-band full-duplex (IBFD) massive multiple-input multiple-output (MIMO) systems and their applications. In response to the unprecedented demands for mobile traffic in concurrent and upcoming wireless networks, a paradigm shift from conventional cellular networks to distributed communication systems becomes imperative. Cell-free massive MIMO (CF-mMIMO) emerges as a practical and scalable implementation of distributed/network MIMO systems, serving as a crucial physical layer technology for the advancement of next-generation wireless networks. This architecture inherits benefits from co-located massive MIMO and distributed systems and provides the flexibility for integration with the IBFD technology. We delineate the evolutionary trajectory of cellular networks, transitioning from conventional half-duplex multi-user MIMO networks to IBFD CF-mMIMO. The discussion extends further to the emerging paradigm of network-assisted IBFD CF-mMIMO (NAFD CF-mMIMO), serving as an energy-efficient prototype for asymmetric uplink and downlink communication services. This novel approach finds applications in dual-functionality scenarios, including simultaneous wireless power and information transmission, wireless surveillance, and integrated sensing and communications. We highlight various current use case applications, discuss open challenges, and outline future research directions aimed at fully realizing the potential of NAFD CF-mMIMO systems to meet the evolving demands of future wireless networks.

Ten Years of Research Advances in Full-Duplex Massive MIMO

TL;DR

An overview of ongoing research endeavors focused on in-band full-duplex (IBFD) massive multiple-input multiple-output (MIMO) systems and their applications and the emerging paradigm of network-assisted IBFD CF-mMIMO (NAFD CF-mMIMO), serving as an energy-efficient prototype for asymmetric uplink and downlink communication services.

Abstract

We present an overview of ongoing research endeavors focused on in-band full-duplex (IBFD) massive multiple-input multiple-output (MIMO) systems and their applications. In response to the unprecedented demands for mobile traffic in concurrent and upcoming wireless networks, a paradigm shift from conventional cellular networks to distributed communication systems becomes imperative. Cell-free massive MIMO (CF-mMIMO) emerges as a practical and scalable implementation of distributed/network MIMO systems, serving as a crucial physical layer technology for the advancement of next-generation wireless networks. This architecture inherits benefits from co-located massive MIMO and distributed systems and provides the flexibility for integration with the IBFD technology. We delineate the evolutionary trajectory of cellular networks, transitioning from conventional half-duplex multi-user MIMO networks to IBFD CF-mMIMO. The discussion extends further to the emerging paradigm of network-assisted IBFD CF-mMIMO (NAFD CF-mMIMO), serving as an energy-efficient prototype for asymmetric uplink and downlink communication services. This novel approach finds applications in dual-functionality scenarios, including simultaneous wireless power and information transmission, wireless surveillance, and integrated sensing and communications. We highlight various current use case applications, discuss open challenges, and outline future research directions aimed at fully realizing the potential of NAFD CF-mMIMO systems to meet the evolving demands of future wireless networks.
Paper Structure (40 sections, 2 theorems, 34 equations, 11 figures, 6 tables)

This paper contains 40 sections, 2 theorems, 34 equations, 11 figures, 6 tables.

Table of Contents

  1. Introduction
  2. Existing Surveys and Tutorials
  3. IBFD
  4. Massive MIMO
  5. CF-mMIMO
  6. Main Contributions and Paper Organization
  7. In-Band Full-Duplex and Massive MIMO Techniques: State-of-the-Arts and Review
  8. In-Band Full-Duplex Communications
  9. Massive MIMO Communications
  10. Implementation Efforts and Standardization
  11. IBFD Radios
  12. Massive MIMO
  13. IBFD Massive MIMO
  14. In-Band Full-Duplex Cellular Networks
  15. Traditional HD-MU-MIMO Cellular Networks
  16. ...and 25 more sections

Key Result

Proposition 1

With PZF precoding, the achievable DL SE at the $k$-th DL UE is given by where ${\bf a} \triangleq \{a_m\}$, $\boldsymbol{\theta}\triangleq \{\theta_{mk}\}$, and ${\boldsymbol{\varsigma}} \triangleq \{{\varsigma}_{\ell}\}, \forall m,k,\ell$. Moreover, $i\in\{\mathtt{NAFD}, \mathsf{FD},\mathsf{HD}\}$ denotes different CF-mMIMO structures, while $\mu^\mathtt{NAFD}=\mu^\mat

Figures (11)

  • Figure 1: Illustrative figure showcasing the five unique features of massive MIMO technology and the scientific breakthroughs in the IBFD massive MIMO space.
  • Figure 2: Diagram of an HD MU-MIMO cellular system with DL and UL UEs.
  • Figure 3: Diagram of an IBFD MU-MIMO cellular system with DL and UL UEs.
  • Figure 4: Diagram of an IBFD CF-mMIMO system with DL and UL UEs. All APs coherently transmit to all DL UEs and simultaneously receive from all UL UEs over the same frequency.
  • Figure 5: Diagram of an NAFD CF-mMIMO system with HD UL-/DL-APs and DL and UL UEs. The HD UL-APs serve UL UEs, while the HD DL-APs coherently transmit to the DL UEs.
  • ...and 6 more figures

Theorems & Definitions (5)

  • Proposition 1
  • proof
  • Proposition 2
  • proof
  • Remark 1