Special Issue "Massive MIMO Systems for 5G and beyond Networks: Latest Advances and Prospects"
A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Electrical, Electronics and Communications Engineering".
Deadline for manuscript submissions: closed (15 September 2022) | Viewed by 13659
2. Department of Engineering and Computer Sciences, Autonoma University of Lisbon, 1150-293 Lisboa, Portugal
Interests: cellular communications; 6G and beyond; massive-MIMO; millimeter-wave communications; block transmission techniques; NOMA, LIS & RIS systems
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Transmission techniques, such as massive multiple-input multiple-output (MIMO), non-orthogonal multiple access (NOMA), block transmission techniques, or millimeter-wave communications (mm-Wave) are expected to be a crucial part of 5G (Fifth Generation) systems and beyond. Similar techniques are being adopted by IEEE 802.11 standards, such as in 802.11ad, where orthogonal frequency-division multiple access (OFDMA), mm-Wave, and massive MIMO (m-MIMO) is utilized. However, mm-Wave transmissions have significant problems, such as high free-space path losses, very small diffraction effects, huge losses due to obstacles and implementation difficulties, namely with power amplification. On the other hand, small wavelengths mean that we can have small antennas and small-sized antenna aggregates with a large number of elements, facilitating the deployment of m-MIMO schemes. The use of multiple antennas at both the transmitter and receiver aims to improve performance or to increase the symbol rate of systems, but it usually requires higher implementation complexity. m-MIMO schemes involving several tens or even hundreds of antenna elements are central technologies of 5G systems, where higher capacity and spectral efficiency are required, as compared to previous systems, but where low complexity is an important issue. Due to the existence of millions of devices, spectrum is becoming a scarce resource. NOMA is an alternative multiple access technique, which tends to present better spectral efficiency and cell capacity, but clustering is still a limitation, and coordination between users (coordinated NOMA) makes it more effective.
While 5G requirements are achieved based on mm-Wave and m-MIMO, 6G must incorporate new concepts and frequency bands not yet considered for cellular communications. This includes Visible Light Communications (VLC) and Terahertz bands (100 GHz – 10 THz), enabling data rates in the order of 1 Tbps (nomadic) or 1 Gbps (mobile), with improved energy and spectral efficiencies. VLC is a mature communication technique well suited for short range coverage, though susceptible to interferences, such as from the sun. On the other hand, flying vehicles, such as drones, alongside with a communications paradigm based on heterogenous networks (conventional cells, Vehicle-to-Everything communications [V2X], IoT, drones, balloons, satellites, etc.), will require a three-dimensional (3D) network architecture, with 3D coverage, instead of 2-dimensional, as considered by 5G. Mobility speeds of up to 1000 km/h are also expected to be a requirement of 6G.
This Special Issue aims to provide an overview of 5G communications and beyond, including the perspectives for 6G communications, in terms of network, services, and requirements, while describing advances in transmission techniques foreseen for future updates of 5G. All new ideas about how to improve performance, capacity, and/or spectrum efficiency of transmission techniques for 5G and beyond, while keeping computational cost at an acceptable level are most welcome. Contributions to this Special Issue should provide an overview of how the proposed transmission techniques bring added value to the advances of cellular communications, in terms of performance and/or advanced requirements.
Prof. Dr. Mario Marques Da Silva
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- 5G and beyond
- massive MIMO
- millimeter-wave communications
- block transmission techniques
- non-orthogonal multiple access
- 6G Communications
- visible light communications and terahertz bands