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Applied Sciences
Special Issues
Transmission Techniques for 5G and Beyond
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Transmission Techniques for 5G and Beyond

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 (31 August 2020) | Viewed by 10992

Special Issue Editor

Dr. Mário Marques da Silva

E-Mail Website
Guest Editor
1. Instituto de Telecomunicações, 1049-001 Lisboa, Portugal
2. Department of Sciences and Technologies, Universidade Autónoma de Lisboa, 1169-023 Lisboa, Portugal
Interests: cellular communications; 5G and beyond; massive-MIMO; millimeter-wave communications; block transmission techniques; NOMA
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

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. OFDM/A suffers from a high peak-to-average power ratio. NOMA is an alternative multiple access technique, which tends to present better spectral efficiency, but clustering is still a limitation, and coordination between users (coordinated NOMA) makes it more effective.

This Special Issue, “Transmission Techniques for 5G and Beyond”, will provide an overview of 5G communications and beyond, in terms of network, services, and requirements, while describing advances in transmission techniques foreseen for future versions. 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.

The topics of this Special Issue include, but are not limited to the following:

  • 5G and beyond
  • Massive MIMO
  • Millimeter-wave communications
  • Block transmission techniques
  • Non-orthogonal multiple access

Prof. Mário Marques da Silva Silva
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • 5G and Beyond
  • massive-MIMO
  • millimeter-wave communications
  • block transmission techniques
  • NOMA

Published Papers (3 papers)

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Research

13 pages, 11324 KiB  
Article
Estimating the Performance of MIMO SC-FDE Systems Using SISO Measurements
by Daniel Fernandes, Francisco Cercas, Rui Dinis and Pedro Sebastião
Appl. Sci. 2020, 10(21), 7492; https://0-doi-org.brum.beds.ac.uk/10.3390/app10217492 - 25 Oct 2020
Viewed by 1841
Abstract
The demand for ubiquitous telecommunications services forces operators to have a special concern about signal quality and the coverage area they offer to their customers. This was usually checked by using suitable propagation models for Single Input Single Output (SISO) systems, which are [...] Read more.
The demand for ubiquitous telecommunications services forces operators to have a special concern about signal quality and the coverage area they offer to their customers. This was usually checked by using suitable propagation models for Single Input Single Output (SISO) systems, which are no longer the case for new and future mobile generations, such as 5G and beyond. To guarantee good signal quality coverage, operators started to replace these models with Multiple Input Multiple Output (MIMO) ones. To achieve the best results, these models are usually calibrated with Drive Test (DT) measures; however, the DTs available for MIMO propagation models are sparse, in contrast to SISO ones. The main contribution presented in this paper is a methodology to extend the propagation models of SISO systems so they can be applied in MIMO sytems with Single-Carrier and Frequency-Domain Equalization (SC-FDE), while still using DTs acquired for SISO systems. This paper presents the impact on Bit Error Rate (BER) performance and its coverage area resulting from the application of our proposed method. We consider a MIMO SC-FDE system with an Iterative Block Decision Feedback Equalization (IB-DFE) receiver and we present the improvement expressions for the BER that we illustrate with some simulations. Full article
(This article belongs to the Special Issue Transmission Techniques for 5G and Beyond)
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12 pages, 1985 KiB  
Article
On the 5G and Beyond
by Mário Marques da Silva and João Guerreiro
Appl. Sci. 2020, 10(20), 7091; https://0-doi-org.brum.beds.ac.uk/10.3390/app10207091 - 12 Oct 2020
Cited by 36 | Viewed by 5341
Abstract
This article provides an overview of the fifth generation of cellular communications (5G) and beyond. It presents the transmission techniques of current 5G communications and those expected of future developments, namely a brief study of non-orthogonal multiple access (NOMA) using the single carrier [...] Read more.
This article provides an overview of the fifth generation of cellular communications (5G) and beyond. It presents the transmission techniques of current 5G communications and those expected of future developments, namely a brief study of non-orthogonal multiple access (NOMA) using the single carrier with frequency domain equalization (SC-FDE) block transmission technique, evidencing its added value in terms of spectral efficiency. An introduction to the sixth generation of cellular communications (6G) is also provided. The insertion of 5G and 6G within the Fourth Industrial Revolution framework (also known as Industry 4.0) is also dealt with. Consisting of a change in paradigm, when compared to previous generations, 5G supports a myriad of new services based on the Internet of things (IoT) and on vehicle-to-vehicle (V2V) communications, supporting technologies such as autonomous driving, smart cities, and remote surgery. The new services provided by 5G are supported by new techniques, such as millimeter waves (mm-wave), in addition to traditional microwave communication, and by massive multiple-input multiple-output (m-MIMO) technology. These techniques were not employed in the fourth generation of cellular communications (4G). While 5G plays an important role in the initial implementation of the Fourth Industrial Revolution, 6G will address a number of new services such as virtual reality (VR), augmented reality (AR), holographic services, the advanced Internet of things (IoT), AI-infused applications, wireless brain–computer interaction (BCI), and mobility at higher speeds. The current research on systems beyond 5G indicates that these applications shall be supported by new MIMO techniques and make use of terahertz (THz) bands. Full article
(This article belongs to the Special Issue Transmission Techniques for 5G and Beyond)
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19 pages, 5350 KiB  
Article
Precoded Generalized Spatial Modulation for Downlink MIMO Transmissions in Beyond 5G Networks
by João Pedro Pavia, Vasco Velez, Bernardo Brogueira, Nuno Souto and Américo Correia
Appl. Sci. 2020, 10(18), 6617; https://0-doi-org.brum.beds.ac.uk/10.3390/app10186617 - 22 Sep 2020
Cited by 2 | Viewed by 2935
Abstract
The design of multiple input multiple output (MIMO) schemes capable of achieving both high spectral and energy efficiency constitutes a challenge for next-generation wireless networks. MIMO schemes based on generalized spatial modulations (GSM) have been widely considered as a powerful technique to achieve [...] Read more.
The design of multiple input multiple output (MIMO) schemes capable of achieving both high spectral and energy efficiency constitutes a challenge for next-generation wireless networks. MIMO schemes based on generalized spatial modulations (GSM) have been widely considered as a powerful technique to achieve that purpose. In this paper, a multi-user (MU) GSM MIMO system is proposed, which relies on the transmission of precoded symbols from a base station to multiple receivers. The precoder’s design is focused on the removal of the interference between users and allows the application of single-user GSM detection at the receivers, which is accomplished using a low-complexity iterative algorithm. Link level and system level simulations of a cloud radio access network (C-RAN) comprising several radio remote units (RRUs) were run in order to evaluate the performance of the proposed solution. Simulation results show that the proposed GSM MU-MIMO approach can exploit efficiently a large number of antennas deployed at the transmitter. Moreover, it can also provide large gains when compared to conventional MU-MIMO schemes with identical spectral efficiencies. In fact, regarding the simulated C-RAN scenario with perfect channel estimation, system level results showed potential gains of up to 155% and 139% in throughput and coverage, respectively, compared to traditional cellular networks. The introduction of imperfect channel estimation reduces the throughput gain to 125%. Full article
(This article belongs to the Special Issue Transmission Techniques for 5G and Beyond)
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