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The feature thwarts efforts to cater for pressing connectivity demands posed by modern-day cellular communication networks. Non-orthogonal multiple access, regarded as a key advancement towards realization of high-speed 5G wireless communication networks, enables multiple users to access the same set of resource blocks non-orthogonally in terms of power with controllable interference, thereby allowing for overall performance enhancement. Owing to the combinatorial nature of the underlying optimization problem involving user pairing\/grouping scheme, power control and decoding order, the computational complexity in determining optimal and sub-optimal solutions remains considerably high. This work proposes three novel alternative approaches (Randomly, 2-Opt and Hybrid) for arriving at a near-optimal solution for the problem of user pairing\/grouping. The algorithms not only offer reduced computational complexity but also outperform orthogonal multiple access and existing schemes reported in the literature for uplink non-orthogonal multiple access systems. <\/jats:p>","DOI":"10.1177\/15501477211057443","type":"journal-article","created":{"date-parts":[[2021,12,1]],"date-time":"2021-12-01T12:34:20Z","timestamp":1638362060000},"page":"155014772110574","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":26,"title":["Joint power control and user grouping for uplink power domain non-orthogonal multiple access"],"prefix":"10.1177","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2349-7518","authenticated-orcid":false,"given":"Bilal Ur","family":"Rehman","sequence":"first","affiliation":[{"name":"Department of Electrical Engineering, Faculty of Electrical and Computer Engineering, University of Engineering and Technology, Peshawar, Pakistan"}]},{"given":"Mohammad Inayatullah","family":"Babar","sequence":"additional","affiliation":[{"name":"Department of Electrical Engineering, Faculty of Electrical and Computer Engineering, University of Engineering and Technology, Peshawar, Pakistan"}]},{"given":"Arbab Waheed","family":"Ahmad","sequence":"additional","affiliation":[{"name":"Department of Electrical and Computer Engineering, PAF-IAST, Haripur, Pakistan"}]},{"given":"Hesham","family":"Alhumyani","sequence":"additional","affiliation":[{"name":"Department of Computer Engineering, College of Computers and Information Technology, Taif University, Taif, Saudi Arabia"}]},{"given":"Gamil","family":"Abdel Azim","sequence":"additional","affiliation":[{"name":"Department of Computer Science, Faculty of Computer Science, Suez Canal University, Ismailia, Egypt"}]},{"given":"Rashid A.","family":"Saeed","sequence":"additional","affiliation":[{"name":"Department of Computer Engineering, College of Computers and Information 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