{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,27]],"date-time":"2026-01-27T22:11:21Z","timestamp":1769551881204,"version":"3.49.0"},"reference-count":38,"publisher":"MDPI AG","issue":"20","license":[{"start":{"date-parts":[[2020,10,12]],"date-time":"2020-10-12T00:00:00Z","timestamp":1602460800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"FCT\/MCTES","award":["UIDB\/50008\/2020"],"award-info":[{"award-number":["UIDB\/50008\/2020"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Applied Sciences"],"abstract":"<jats:p>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\u2013computer 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.<\/jats:p>","DOI":"10.3390\/app10207091","type":"journal-article","created":{"date-parts":[[2020,10,13]],"date-time":"2020-10-13T08:55:53Z","timestamp":1602579353000},"page":"7091","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":64,"title":["On the 5G and Beyond"],"prefix":"10.3390","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5498-3220","authenticated-orcid":false,"given":"M\u00e1rio Marques da","family":"Silva","sequence":"first","affiliation":[{"name":"Instituto de Telecomunica\u00e7\u00f5es, 1049-001 Lisboa, Portugal"},{"name":"Department of Sciences and Technologies, Autonoma University of Lisbon, 1150-293 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5106-239X","authenticated-orcid":false,"given":"Jo\u00e3o","family":"Guerreiro","sequence":"additional","affiliation":[{"name":"Instituto de Telecomunica\u00e7\u00f5es, 1049-001 Lisboa, Portugal"},{"name":"Department of Electrical and Computer Engineering, NOVA School of Science and Technology, 825-149 Caparica, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2020,10,12]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"4023","DOI":"10.1109\/LRA.2018.2860628","article-title":"Artificial Intelligence for Long-Term Robot Autonomy: A Survey","volume":"3","author":"Kunze","year":"2018","journal-title":"IEEE Robot. Autom. Lett."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"29","DOI":"10.1109\/MIM.2018.8573590","article-title":"The Fourth Industrial Revolution\u2014Industry 4.0 and IoT","volume":"21","author":"Griffiths","year":"2018","journal-title":"IEEE Instrum. Meas. Mag."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"5247","DOI":"10.1109\/ACCESS.2017.2689040","article-title":"Big IoT Data Analytics: Architecture, Opportunities, and Open Research Challenges","volume":"5","author":"Marjani","year":"2017","journal-title":"IEEE Access"},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Rajnai, Z., and Kocsis, I. (2017., January 14\u201316). Labor market risks of industry 4.0, digitization, robots and AI. Proceedings of the 2017 IEEE 15th International Symposium on Intelligent Systems and Informatics (SISY), Subotica, Serbia.","DOI":"10.1109\/SISY.2017.8080580"},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Zhou, K., Liu, T., and Zhou, L. (2015, January 10\u201312). Industry 4.0: Towards future industrial opportunities and challenges. Proceedings of the 2015 12th International Conference on Fuzzy Systems and Knowledge Discovery (FSKD), Zhangjiajie, China.","DOI":"10.1109\/FSKD.2015.7382284"},{"key":"ref_6","doi-asserted-by":"crossref","unstructured":"Rajasekhar, M., and Jaswal, A. (2015, January 27). Autonomous vehicles: The future of automobiles. Proceedings of the 2015 IEEE International Transportation Electrification Conference (ITEC), Chennai, India.","DOI":"10.1109\/ITEC-India.2015.7386874"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"628","DOI":"10.1109\/TITS.2018.2824119","article-title":"One-Way Car-Sharing Profit Maximization by Means of User-Based Vehicle Relocation","volume":"20","author":"Febbraro","year":"2019","journal-title":"IEEE Trans. Intell. Transp. Syst."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"24","DOI":"10.1109\/MNET.2018.1700232","article-title":"5G Radio Network Design for Ultra-Reliable Low-Latency Communication","volume":"32","author":"Sachs","year":"2018","journal-title":"IEEE Netw."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"40","DOI":"10.1109\/MSP.2011.2178495","article-title":"Scaling up MIMO: Opportunities and challenges with very large arrays","volume":"30","author":"Rusek","year":"2012","journal-title":"IEEE Signal Process. Mag."},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"da Silva, M.M., and Monteiro, F.A. (2014). Chapter in MIMO Processing for 4G and Beyond: Fundamentals and Evolution. MIMO Techniques and Applications, CRC Press Auerbach Publications.","DOI":"10.1201\/b17021-2"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"355","DOI":"10.1016\/j.phycom.2017.06.002","article-title":"A Simplified Massive MIMO Implemented with Pre or Post-Processing","volume":"25","author":"Dinis","year":"2017","journal-title":"Phys. Commun."},{"key":"ref_12","unstructured":"IEEE 802.11 Task Group (2010). PHY\/MAC Complete Proposal Specification, IEEE 802.11-10\/0433r2."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"335","DOI":"10.1109\/ACCESS.2013.2260813","article-title":"Millimeter Wave Mobile Communications for 5G Cellular: It Will Work!","volume":"1","author":"Rappaport","year":"2013","journal-title":"IEEE Access"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"74","DOI":"10.1109\/MCOM.2014.6736746","article-title":"Five disruptive technology directions for 5G","volume":"52","author":"Boccardi","year":"2014","journal-title":"IEEE Commun. Mag."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"3","DOI":"10.3390\/telecom1010002","article-title":"A Low Complexity Channel Estimation and Detection for Massive MIMO using SC-FDE","volume":"1","author":"Dinis","year":"2020","journal-title":"Telecom"},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Nie, S., MacCartney, G., Sun, S., and Rappaport, T. (2014, January 10\u201314). 28 GHz and 73 GHz Signal Outage Study for Millimeter Wave Cellular and Backhaul Communications. Proceedings of the 2014 IEEE International Conference on Communications (ICC), Sydney, Australia.","DOI":"10.1109\/ICC.2014.6884089"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"366","DOI":"10.1109\/JPROC.2014.2299397","article-title":"Millimeter-Wave Cellular Wireless Networks: Potentials and Challenges","volume":"102","author":"Rangan","year":"2014","journal-title":"IEEE"},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"Marques da Silva, M., Correia, A., Dinis, R., Souto, N., and Silva, J. (2010). Transmission Techniques for Emergent Multicast and Broadcast Systems, CRC Press Auerbach Publications. [1st ed.].","DOI":"10.1201\/EBK1439815939"},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"da Silva, M.M. (2016). Cable and Wireless Networks: Theory & Practice, CRC Press. [1st ed.].","DOI":"10.1201\/b19700"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"62","DOI":"10.1109\/MCOM.2014.6736744","article-title":"5G Wireless Communication Systems: Prospects and Challenges","volume":"52","author":"Thompson","year":"2014","journal-title":"IEEE Commun. Mag."},{"key":"ref_21","unstructured":"(2015). ITU-R Recommendation M.2083-0. IMT Vision\u2014Framework and Overall Objectives of the Future Development of IMT for 2020 and Beyond, Eletronic Publication."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"1065","DOI":"10.1109\/JSAC.2014.2328098","article-title":"What Will 5G Be?","volume":"32","author":"Andrews","year":"2014","journal-title":"IEEE J. Sel. Areas Commun."},{"key":"ref_23","first-page":"12","article-title":"Tentative 3GPP Timeline for 5G [Mobile Radio]","volume":"10","author":"Gozalvez","year":"2015","journal-title":"IEEE Veh. Technol. Mag."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"186","DOI":"10.1109\/MCOM.2015.7010533","article-title":"Large-Scale Antenna Systems with Hybrid Analog and Digital Beamforming for Millimeter Wave 5G","volume":"53","author":"Han","year":"2015","journal-title":"IEEE Commun. Mag."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"186","DOI":"10.1109\/MCOM.2014.6736761","article-title":"Massive MIMO for next generation wireless systems","volume":"52","author":"Larsson","year":"2014","journal-title":"IEEE Commun. Mag."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"3619","DOI":"10.1109\/ACCESS.2017.2779844","article-title":"A Survey on 5G Networks for the Internet of Things: Communication Technologies and Challenges","volume":"6","author":"Akpakwu","year":"2017","journal-title":"IEEE Access"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"90","DOI":"10.1109\/MCOM.2016.1600336CM","article-title":"Waveform and Numerology to Support 5G Services and Requirements","volume":"54","author":"Zaidi","year":"2016","journal-title":"IEEE Commun. Mag."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"313","DOI":"10.1109\/LCOMM.2013.123113.132450","article-title":"Non-Orthogonal Multiple Access in Downlink Coordinated Two-Point Systems","volume":"18","author":"Choi","year":"2014","journal-title":"IEEE Commun. Lett."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"1462","DOI":"10.1109\/LCOMM.2015.2441064","article-title":"Cooperative Non-Orthogonal Multiple Access in 5G Systems","volume":"19","author":"Ding","year":"2015","journal-title":"IEEE Commun. Lett."},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"Higuchi, K., and Benjebbour, A. (2015). Non-orthogonal Multiple Access (NOMA) with Successive Interference Cancellation for Future Radio Access. IEICE Trans. Commun., 403\u2013414.","DOI":"10.1587\/transcom.E98.B.403"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"74","DOI":"10.1109\/MCOM.2015.7263349","article-title":"Non-Orthogonal Multiple Access for 5G: Solutions Challenges Opportunities and Future Research Trends","volume":"53","author":"Dai","year":"2015","journal-title":"IEEE Commun. Mag."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"185","DOI":"10.1109\/MCOM.2017.1500657CM","article-title":"Application of Non-Orthogonal Multiple Access in LTE and 5G Networks","volume":"55","author":"Ding","year":"2017","journal-title":"IEEE Commun. Mag."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"537","DOI":"10.1109\/TWC.2015.2475746","article-title":"The Application of MIMO to Non-Orthogonal Multiple Access","volume":"15","author":"Ding","year":"2016","journal-title":"IEEE Trans. Wirel. Commun."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"579","DOI":"10.1109\/LCOMM.2004.835339","article-title":"Iterative Layered Space-Time Receivers for Single-Carrier Transmission over Severe Time-Dispersive Channels","volume":"8","author":"Dinis","year":"2004","journal-title":"IEEE Commun. Lett."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"134","DOI":"10.1109\/MNET.001.1900287","article-title":"A Vision of 6G Wireless Systems: Applications, Trends, Technologies, and Open Research Problems","volume":"34","author":"Saad","year":"2020","journal-title":"IEEE Netw."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"28","DOI":"10.1109\/MVT.2019.2921208","article-title":"6G Wireless Networks: Vision, Requirements, Architecture, and Key Technologies","volume":"14","author":"Saad","year":"2019","journal-title":"IEEE Veh. Technol. Mag."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"55","DOI":"10.1109\/MCOM.001.1900411","article-title":"Toward 6G Networks: Use Cases and Technologies","volume":"58","author":"Giordani","year":"2020","journal-title":"IEEE Commun. Mag."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"3211","DOI":"10.1109\/TWC.2011.081011.100545","article-title":"Channel Modeling and Capacity Analysis for Electromagnetic Wireless Nanonetworks in the Terahertz Band","volume":"10","author":"Jornet","year":"2011","journal-title":"IEEE Trans. Wirel. 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