This paper investigates the downlink transmission of reconfigurable intelligent surface (RIS)-aided cooperative non-orthogonal-multiple-access (C-NOMA), where both half-duplex (HD) and full-duplex (FD) relaying modes are considered. The system model consists one base station (BS), two users RIS. goal is to minimize total transmit power at BS user-cooperating relay for each mode by jointly optim...
