HIGHLIGHTS
SUMMARY
Comprehensive surveys of the results obtained thus far in RIS-NOMA have been published (Ding et_al, 2022; Hou et_al, 2019; and Yang et_al, 2021, see also references therein). RIS provides a "passive beamforming" for those users (Hou et_al, 2019; Hou et_al, 2020; Yang et_al, 2021; Imene et_al, 2022) as well, but, physically, its modeling depends on the wave reflection mechanism of RIS. In fact, RIS is mainly implemented as a block of many reflectors (analog to passive "MIMO" antennas), which are controlled by the specific RIS controller (Ding et_al, 2022; Hou et_al, 2019; Yang . . .
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