Cell-Free Massive MIMO: A New Next-Generation Paradigm

Zhang, Jiayi; Chen, ShuaiFei; Lin, Yan; Zheng, Jiakang; Ai, Bo; Hanzo, Lajos

doi:10.1109/access.2019.2930208

Cited by 404 publications

(249 citation statements)

References 52 publications

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“…It is the UEs that select which set of APs that it is best served by, not the network. Early experiments with cell-free networks are described in [33], but it is first in recent years that the concept has gained significant traction from academia [34], [35], where the name cell-free massive MIMO has been coined [36]- [38]. In a nutshell, it is a combination of the best aspects of network MIMO that were conceived in the last decade and the analytical framework from the massive MIMO literature, recently surveyed in the textbooks [11], [12].…”

Section: A Motivationmentioning

confidence: 99%

Prospective Multiple Antenna Technologies for Beyond 5G

Zhang

Björnson

Matthaiou

et al. 2020

IEEE J. Select. Areas Commun.

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701

370

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Multiple antenna technologies have attracted much research interest for several decades and have gradually made their way into mainstream communication systems. Two main benefits are adaptive beamforming gains and spatial multiplexing, leading to high data rates per user and per cell, especially when large antenna arrays are adopted. Since multiple antenna technology has become a key component of the fifth-generation (5G) networks, it is time for the research community to look for new multiple antenna technologies to meet the immensely higher data rate, reliability, and traffic demands in the beyond 5G era. Radically new approaches are required to achieve orders-of-magnitude improvements in these metrics. There will be large technical challenges, many of which are yet to be identified. In this paper, we survey three new multiple antenna technologies that can play key roles in beyond 5G networks: cellfree massive MIMO, beamspace massive MIMO, and intelligent reflecting surfaces. For each of these technologies, we present the fundamental motivation, key characteristics, recent technical progresses, and provide our perspectives for future research directions. The paper is not meant to be a survey/tutorial of a mature subject, but rather serve as a catalyst to encourage more research and experiments in these multiple antenna technologies. Index Terms-Beyond 5G, cell-free massive MIMO, beamspace, intelligent reflecting surface. I. INTRODUCTION T HE demand for higher data rates and traffic volumes seems to be never-ending, thus the quest for delivering The work of J.

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Section: A Motivationmentioning

confidence: 99%

Prospective Multiple Antenna Technologies for Beyond 5G

Zhang

Björnson

Matthaiou

et al. 2020

IEEE J. Select. Areas Commun.

Self Cite

701

370

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“…Indeed, CoMP-included in LTE-Advanced (4.5G)-has not met the initial expectations [74]. Conversely, there are at least five main reasons why cell-free massive MIMO, unlike CoMP, is deemed to be a beyond-5G key enabling technology [75][76][77][78][79]: ( ) the massive MIMO baseline operation, ( ) the user-centric perspective set up by dynamic cooperation clustering, ( ) predictable performance which gives room to a simplified resource optimization, ( ) the potential marriage with mmWave, and ( ) the emerging cost-efficient solutions for the deployments. These aspects will be discussed in detail in Chapter 3.…”

Section: Cell-free Massive Mimo: the Ultimate Network Mimo Embodimentmentioning

confidence: 99%

Cell-Free Massive MIMO : Scalability, Signal Processing and Power Control

Interdonato

2020

Linköping Studies in Science and Technology. Dissertations

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Linköping 2020 This is a Swedish Doctor of Philosophy thesis. The Doctor of Philosophy degree comprises 240 ECTS credits of postgraduate studies. Cover: Illustration of the Ericsson Radio Stripes concept, co-invented by the author of this thesis. The Radio Stripes constitute a way to implement a cell-free massive MIMO system. They aim at enabling invisible, low-cost deployment of large number of distributed access points in the vicinity of the users. This is achieved by serial integration of several transmitting and receiving components into a cable (or stripe) which also provides fronthaul communication and power supply.

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“…Millimeter wave (mmWave) communications operating in the frequency band spanning from 30 to 300GHz have at-tracted considerable interest for the development of beyond 5G wireless networks [1]- [7]. They can be readily combined with large-scale antenna array techniques for dramatically improving system capacity, hence mitigating the current radio spectrum shortage.…”

Section: Introductionmentioning

confidence: 99%

Two-Timescale Hybrid Analog-Digital Beamforming for mmWave Full-Duplex MIMO Multiple-Relay Aided Systems

Liu

Zhao

et al. 2020

IEEE J. Select. Areas Commun.

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Due to the severe pathloss experienced by electromagnetic wave transmission in the mmWave band, one challenge for the design of millimeter wave (mmWave) communication systems is coverage extension. Aiming to improve the coverage and sum rate performance of mmWave communications, we investigate new schemes for the design of full-duplex (FD) mmWave multiple-input multiple-output (MIMO) multiple-relay systems. Specifically, we propose a novel two-timescale analog-digital hybrid beamforming scheme to maximize the sum rate, while reducing the system complexity and channel state information (CSI) signalling overhead, as well as mitigating the effects of selfinterference and CSI errors caused by the delays. In the proposed scheme, the long-timescale analog beamforming matrices are designed based on the available channel statistics and updated in a frame-based manner, where a frame contains a fixed number of time slots, while for each time slot, the short-timescale digital beamforming matrices are optimized based on low-dimensional effective CSI matrices available in real-time. We develop an effective analog beamforming algorithm based on the cut-set bound and stochastic successive convex approximation (SSCA) and an innovative digital beamforming algorithm that relies on the theory of penalty dual decomposition (PDD) to maximize the system sum rate. The convergence properties and computational complexity of the proposed algorithms are also examined. Our simulation results show that the proposed two-timescale hybrid beamforming design significantly outperforms the conventional beamforming algorithms both in terms of the CSI-signalling overhead and the achievable sum rate in the presence of CSI delays.

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Cell-Free Massive MIMO: A New Next-Generation Paradigm

Cited by 404 publications

References 52 publications

Prospective Multiple Antenna Technologies for Beyond 5G

Prospective Multiple Antenna Technologies for Beyond 5G

Cell-Free Massive MIMO : Scalability, Signal Processing and Power Control

Two-Timescale Hybrid Analog-Digital Beamforming for mmWave Full-Duplex MIMO Multiple-Relay Aided Systems

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