Journal ArticleDOI
Cell-Free Massive MIMO: A Survey
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TLDR
In this article , a comprehensive survey of different aspects of the cell-free massive MIMO system from the general system model, the detailed system operation, the limitations towards a practically implemented system to the potential of integrating the system with emerging techniques/technologies.Abstract:
Towards a fully connected intelligent digital world, 5G and beyond networks experience a new era of Internet of intelligence with connected people and things. This new era brings challenging demands to the network, such as high spectral efficiency, low-latency, high-reliable communication, and high energy efficiency. One of the major technological breakthroughs to cope with these unprecedented demands is the cell-free (CF) massive multiple-input multiple-output (mMIMO) systems. In CF mMIMO, a large number of distributed access points are connected to a central processing unit, and serve a smaller number of users over the same time-frequency resources. The system has shown a great potential in improving the network performance in various perspectives compared to the co-located mMIMO and conventional small-cell systems. Furthermore, the system can be flexibly integrated with various emerging techniques/technologies for 5G and beyond networks to boost the network performance in different perspectives. Despite the substantial reported theoretical gains of CF mMIMO systems, the full picture of a practical scalable deployment of the system is not clear yet. In this paper, we provide a comprehensive survey of different aspects of the CF mMIMO system from the general system model, the detailed system operation, the limitations towards a practically implemented system to the potential of integrating the system with emerging techniques/technologies. Besides, we provide a number of timely open problems and future research directions to fully exploit the CF mMIMO system potential in delivering the anticipated requirements of future wireless networks. read more
Citations
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Journal ArticleDOI
Deep Learning for Massive MIMO Uplink Detectors
TL;DR: In this paper , the authors provide insights on DL-based massive MIMO detectors and classify them so that a reader can find the differences between various architectures with a wider range of potential solutions and variations.
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Recent Progress in Reconfigurable and Intelligent Metasurfaces: A Comprehensive Review of Tuning Mechanisms, Hardware Designs, and Applications
TL;DR: In this paper , the authors reviewed the recent progress in the field of intelligent metasurfaces, focusing particularly on tuning mechanisms, hardware designs, and applications, and provided a perspective on the challenges and future directions of intelligent surfaces.
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Recent Progress in Reconfigurable and Intelligent Metasurfaces: A Comprehensive Review of Tuning Mechanisms, Hardware Designs, and Applications (Adv. Sci. 33/2022)
TL;DR: Reconfigurable intelligent surfaces (RISs) that can alter their wireless environments, and are considered as a promising technology for sixth-generation communication networks, are explored.
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Unmanned Aerial Vehicle Communications for Civil Applications: A Review
TL;DR: In this paper , the authors reviewed the current applications of UAVs for civil and commercial purposes and investigated the challenges and communication requirements associated with UAV-based communication systems, and identified areas of future research.
Journal ArticleDOI
Uplink Performance of MmWave-Fronthaul Cell-Free Massive MIMO Systems
TL;DR: In this article , the authors investigated the uplink performance of CF mMIMO systems supported by mmWave-fronthaul networks and derived analytical expressions for both the provided fronthaul capacity and the average UL data rates.
References
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Millimeter Wave Mobile Communications for 5G Cellular: It Will Work!
Theodore S. Rappaport,Shu Sun,Rimma Mayzus,Hang Zhao,Yaniv Azar,Kevin H. Wang,George N. Wong,Jocelyn K. Schulz,Mathew K. Samimi,Felix Gutierrez +9 more
TL;DR: The motivation for new mm-wave cellular systems, methodology, and hardware for measurements are presented and a variety of measurement results are offered that show 28 and 38 GHz frequencies can be used when employing steerable directional antennas at base stations and mobile devices.
Journal ArticleDOI
ESPRIT-estimation of signal parameters via rotational invariance techniques
R. Roy,Thomas Kailath +1 more
TL;DR: Although discussed in the context of direction-of-arrival estimation, ESPRIT can be applied to a wide variety of problems including accurate detection and estimation of sinusoids in noise.
Journal ArticleDOI
Noncooperative Cellular Wireless with Unlimited Numbers of Base Station Antennas
TL;DR: A cellular base station serves a multiplicity of single-antenna terminals over the same time-frequency interval and a complete multi-cellular analysis yields a number of mathematically exact conclusions and points to a desirable direction towards which cellular wireless could evolve.
Journal ArticleDOI
Millimeter-Wave Cellular Wireless Networks: Potentials and Challenges
TL;DR: Measurements and capacity studies are surveyed to assess mmW technology with a focus on small cell deployments in urban environments and it is shown that mmW systems can offer more than an order of magnitude increase in capacity over current state-of-the-art 4G cellular networks at current cell densities.
Journal ArticleDOI
An Overview of Massive MIMO: Benefits and Challenges
TL;DR: This paper addresses the potential impact of pilot contamination caused by the use of non-orthogonal pilot sequences by users in adjacent cells, and analyzes the energy efficiency and degrees of freedom provided by massive MIMO systems to enable efficient single-carrier transmission.