Transmit Power Minimization for IRS-Assisted Full-Duplex Cooperative NOMA Networks

Aiming at the shortcomings of traditional network framework, such as limited coverage and small system capacity, this paper considers the combination of Non-Orthogonal Multiple Access (NOMA) technology and Intelligent Reflective Surface (IRS) technology, and constructs a Full-Duplex (FD) cooperative NOMA network based on Simultaneous Wireless Information and Power Transfer (SWIPT). Successive Interference Cancelation (SIC) is applied to meet user requirements to minimize transmission power. Because of variable coupling and nonlinear constraints, this problem cannot be solved directly. To solve the problem, the transmission power of Base Station (BS) beam-forming, the forwarding power, Power Splitting (PS) of SWIPT and IRS reflection coefficient matrix are jointly optimized. The problem is decomposed into two subproblems, and the convex problem caused by coupling optimization variables is solved by Successive Convex Approximation (SCA) and first order Taylor approximation. Alternate iterations are used to optimize the variables. Simulation results show that the proposed NOMA scheme with IRS and SWIPT cooperation requires lower transmit power than other baseline schemes.