Energy-Efficient Cooperative Backscattering Closed-Form Solution for NOMA

Hajar El Hassani (1) , Anne Savard (2, 3, 4, 5) , Elena Veronica Belmega (1) , Rodrigo C. de Lamare (6, 7)

1 ETIS - UMR 8051 - Equipes Traitement de l'Information et Systèmes
2 IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520
3 CSAM - IEMN - Circuits Systèmes Applications des Micro-ondes - IEMN
4 IMT Nord Europe - Ecole nationale supérieure Mines-Télécom Lille Douai
5 CERI SN - IMT Nord Europe - Centre for Digital Systems
6 PUC-Rio - Departamento de Informática = Department of Informatics
7 University of York [York, UK]

In this paper, the energy efficiency of multiuser non orthogonal multiple access (NOMA) systems in the presence of a backscatter device is investigated. The energy efficiency maximization problem is formulated as a tradeoff between the sum rate and the total power consumption and shown to be nonconvex. We then derive a closed-form expression of the optimal reflection coefficient. Remarkably, the obtained expression allows the reformulation of the optimization in terms of the power allocation policy into a convex optimization problem that has recently been solved in closed form. This overall solution can then be exploited to reduce the computational complexity of Dinkelbach's algorithm for maximizing the ratio sum rate vs. total power. Simulation results show that the presence of backscatter devices significantly improve the energy efficiency of NOMA systems and reach up to 450% relative gains compared to OMA.

Domaines: Mathématiques [math]; Sciences de l'ingénieur [physics]

Hajar El Hassani, Anne Savard, Elena Veronica Belmega, Rodrigo C. de Lamare. Energy-Efficient Cooperative Backscattering Closed-Form Solution for NOMA. IEEE Global Communications Conference, GLOBECOM, Dec 2021, Madrid, Spain. ⟨hal-03343731⟩