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In the literature, there is no convenient survey study that rounds up all the necessary points to be investigated concerning such systems. The current deeper review paper inspects and interprets the state of the art and addresses several research axes related to MIMO-OFDM systems. Two topics have received special attention: MIMO waveforms and MIMO-OFDM channel estimation. The existing MIMO hardware and software innovations, in addition to the MIMO-OFDM equalization techniques, are discussed concisely. In the literature, only a few authors have discussed the MIMO channel estimation and modeling problems for a variety of MIMO systems. However, to the best of our knowledge, there has been until now no review paper specifically discussing the recent works concerning channel estimation and the equalization process for MIMO-OFDM systems. Hence, the current work focuses on analyzing the recently used algorithms in the field, which could be a rich reference for researchers. Moreover, some research perspectives are identified.<\/jats:p>","DOI":"10.3390\/signals3020023","type":"journal-article","created":{"date-parts":[[2022,6,3]],"date-time":"2022-06-03T08:01:18Z","timestamp":1654243278000},"page":"359-395","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":62,"title":["A Survey on MIMO-OFDM Systems: Review of Recent Trends"],"prefix":"10.3390","volume":"3","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7827-1527","authenticated-orcid":false,"given":"Houda","family":"Harkat","sequence":"first","affiliation":[{"name":"Centre of Technology and Systems (CTS), FCT Campus, NOVA University of Lisbon, 2829-516 Caparica, Portugal"},{"name":"Faculty of Sciences and Technologies, University of Sidi Mohamed Ben Abdellah, BP 2626, Route Imouzzer, Fes 30000, Morocco"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4664-9238","authenticated-orcid":false,"given":"Paulo","family":"Monteiro","sequence":"additional","affiliation":[{"name":"Instituto de Telecomunica\u00e7\u00f5es, 3810-193 Aveiro, Portugal"},{"name":"DETI, University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"given":"Atilio","family":"Gameiro","sequence":"additional","affiliation":[{"name":"Instituto de Telecomunica\u00e7\u00f5es, 3810-193 Aveiro, Portugal"},{"name":"DETI, University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"given":"Fernando","family":"Guiomar","sequence":"additional","affiliation":[{"name":"Instituto de Telecomunica\u00e7\u00f5es, 3810-193 Aveiro, Portugal"}]},{"given":"Hasmath","family":"Farhana Thariq Ahmed","sequence":"additional","affiliation":[{"name":"Department of Computer Science Engineering, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai 602105, India"}]}],"member":"1968","published-online":{"date-parts":[[2022,6,2]]},"reference":[{"key":"ref_1","unstructured":"Garc\u0131a-Naya, J.A., Gonz\u00e1lez-L\u00f3pez, M., and Castedo, L. 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