- Derive the approximated closed-form expression for the sum-throughput of a downlink cooperative SWIPT NOMA system (via outage probability).
- Formulate an unconstraint maximization problem to find the optimal power-splitting ratio that returns the maximum instantaneous system throughput.
- MATLAB code for the used Gradient descent method.
- MATLAB code for a toy example of Newton method.
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In this paper, we investigate the sum-throughput of cell-center and cell-edge users in downlink scenarios of cooperative simultaneous wireless information and power transfer (SWIPT) non-orthogonal multiple access (NOMA) systems. Specifically, we consider a two-user NOMA system, in which the cell-center user acts as a power-splitting (PS)-based SWIPT relay aiming to improve the performance of the cell-edge user. In order to evaluate the performance of the considered system, we first derive a closed-form expression for the outage probability (OP) of the cell-center user and a closed-form approximate expression for the OP of the cell-edge user. Adopting the gradient decent method, we then propose an algorithm that finds the optimal value of the PS coefficient, which results in a maximum sum-throughput of the system. With the obtained optimal PS coefficient, we show that the optimal SWIPT NOMA system provides essential throughput improvement for the cell-edge user while the use of SWIPT-based relaying transmission does not jeopardize the sum-throughput of the system compared to that of non-cooperative NOMA systems.
- T. N. Do and B. An, "Optimal sum-throughput analysis for downlink cooperative SWIPT NOMA systems," in 2018 2nd International Conference on Recent Advances in Signal Processing, Telecommunications & Computing (SigTelCom), Vietnam, 2018, pp. 85-90, doi: 10.1109/SIGTELCOM.2018.8325811. IEEExplore