Next-Generation Multiple Access With Cell-Free Massive MIMO

doi:10.1109/JPROC.2024.3451372

2024-09-01

PRE

Mohammadali Mohammadi *

Zahra Mobini

Hien Quoc Ngo

Michail Matthaiou

DOI：10.1109/JPROC.2024.3451372

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摘要

En 中文

To meet the unprecedented mobile traffic demands of future wireless networks, a paradigm shift from conventional cellular networks to distributed communication systems is imperative. Cell-free massive multiple-input multiple-output (CF-mMIMO) represents a practical and scalable embodiment of distributed/network MIMO systems. It inherits not only the key benefits of co-located massive MIMO systems but also the macro-diversity gains from distributed systems. This innovative architecture has demonstrated significant potential in enhancing network performance from various perspectives, outperforming co-located mMIMO and conventional small-cell systems. Moreover, CF-mMIMO offers flexibility in integration with emerging wireless technologies such as full-duplex (FD), nonorthogonal transmission schemes, millimeter-wave (mmWave) communications, ultrareliable low-latency communication (URLLC), unmanned aerial vehicle (UAV)-aided communication, and reconfigurable intelligent surfaces (RISs). In this article, we provide an overview of current research efforts on CF-mMIMO systems and their promising future application scenarios. We then elaborate on new requirements for CF-mMIMO networks in the context of these technological breakthroughs. We also present several current open challenges and outline future research directions aimed at fully realizing the potential of CF-mMIMO systems in meeting the evolving demands of future wireless networks.

Keyword:

5G mobile communication

Surveys

Millimeter wave communication

Next generation networking

Wireless networks

Channel estimation

Signal to noise ratio

Cell-free massive multiple-input multiple-output (CF-mMIMO)

energy efficiency (EE)

sixth-generation (6G) wireless

spectral efficiency (SE)