Joint beamforming optimisation for NOMA‐based wireless powered multi‐pair two‐way AF and DF relaying networks

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Abstract
Joint beamforming optimisation for a wireless‐powered multi‐pair two‐way relay network (MP‐TWRN) is studied. Different from the existing works, the authors investigate relay beamforming and power‐domain non‐orthogonal multiple access for the wireless powered MP‐TWRN. The authors' goal is to optimise the energy‐transfer beamforming matrix and the relaying beamforming matrix in the sense of maximising the minimum of the achievable rates among all the users with the power constraint at the relay. Further, they explore the above issue under two relaying schemes: amplify‐and‐forward and decode‐and‐forward. The formulated problems are highly non‐convex, and thus, it is challenging to solve. To address these, they propose two iterative algorithms to solve those two problems based on the difference of convex programming transformation and the successive convex approximation. Simulations demonstrate that the proposed schemes outperform the orthogonal multiple access schemes.

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