Ayad Q. Abdulkareem, Al-Abbasi, Z.Q. , Mustafa Nadhim Ghazal and Khalid Awaad Humood 2022. The Impact of User-Pairing on the Performance of Non-Orthogonal Multiple Access (NOMA) System. Diyala Journal of Engineering Sciences . 15, 1 (Mar. 2022), 81–88. DOI:https://doi.org/10.24237/djes.2022.15108.