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The OFDM\u2010based NOMA systems can achieve high spectral efficiency with resilience to wireless multipath fading. The <jats:styled-content><jats:bold><jats:italic>h<\/jats:italic><\/jats:bold><\/jats:styled-content>\u2010NOMA maintains a low interference level per resource block or low complexity of multiuser detection (MUD) implementation at the receiver and also achieves consistent fairness performance by restricting the maximum number of users per resource block. An improved user clustering algorithm for OFDM\u2010based <jats:styled-content><jats:bold><jats:italic>h<\/jats:italic><\/jats:bold><\/jats:styled-content>\u2010NOMA system under the assumption of user's distinct data rate requirement is presented here. The proposed algorithm takes into consideration both the channel gain of all activated users and the different data rate requirements of weak channel gain users. High peak\u2010to\u2010average power ratio (PAPR) and performance degradation due to strict frequency synchronization requirements are the main drawbacks of such an OFDM\u2010based uplink <jats:styled-content><jats:bold><jats:italic>h<\/jats:italic><\/jats:bold><\/jats:styled-content>\u2010NOMA system. High PAPR of multicarrier NOMA is addressed here with precoding techniques. An enhanced minimum mean square error (MMSE) receiver performing joint equalization and carrier frequency offset (CFO) compensation using low\u2010complexity banded\u2010matrix implementation is proposed to cancel interference in the frequency domain. The MUD is implemented with low\u2010complexity successive interference cancellation (SIC) using bandedmatrix approximation of the interference matrix in the presence of CFO. Moreover, the possibility of utilizing efficient trigonometric transforms to implement OFDM\u2010based NOMA is studied with CFO and estimation errors. For OFDM\u2010based <jats:styled-content><jats:bold><jats:italic>h<\/jats:italic><\/jats:bold><\/jats:styled-content>\u2010NOMA system, an efficient combination of different trigonometric transform configurations to constitute the multicarrier basis for OFDM with a suitable precoding strategy for PAPR reduction is studied.<\/jats:p>","DOI":"10.1002\/ett.3694","type":"journal-article","created":{"date-parts":[[2019,9,3]],"date-time":"2019-09-03T19:41:10Z","timestamp":1567539670000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Trigonometric transforms and precoding strategies for OFDM\u2010based uplink hybrid multi\u2010carrier nonorthogonal multiple access"],"prefix":"10.1002","volume":"30","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8796-7959","authenticated-orcid":false,"given":"Vinay Kumar","family":"Trivedi","sequence":"first","affiliation":[{"name":"Department of Electrical Engineering Indian Institute of Technology Patna  Patna India"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9791-0339","authenticated-orcid":false,"given":"Khaled","family":"Ramadan","sequence":"additional","affiliation":[{"name":"Department of Electronics and Electrical Communication Engineering The Higher Institute of Engineering at Al\u2010Shorouk City  Cairo Egypt"}]},{"given":"Preetam","family":"Kumar","sequence":"additional","affiliation":[{"name":"Department of Electrical Engineering Indian Institute of Technology Patna  Patna India"}]},{"given":"Moawad Ibrahim","family":"Dessouky","sequence":"additional","affiliation":[{"name":"Department of Electronics and Electrical Communication Engineering, Faculty of Electronic Engineering Menoufia University  Menouf Egypt"}]},{"given":"Fathi E.","family":"Abd El\u2010Samie","sequence":"additional","affiliation":[{"name":"Department of Electronics and Electrical Communication Engineering, Faculty of Electronic Engineering Menoufia University  Menouf Egypt"}]}],"member":"311","published-online":{"date-parts":[[2019,9,3]]},"reference":[{"key":"e_1_2_5_2_1","doi-asserted-by":"publisher","DOI":"10.1109\/JSAC.2014.2328098"},{"key":"e_1_2_5_3_1","doi-asserted-by":"publisher","DOI":"10.1109\/JPROC.2014.2299397"},{"key":"e_1_2_5_4_1","doi-asserted-by":"publisher","DOI":"10.1109\/JSTSP.2010.2093210"},{"key":"e_1_2_5_5_1","unstructured":"BanaSV VaraiyaP.Space division multiple access (SDMA) for robust ad hoc vehicle communication networks. 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