Resource Allocation for Wireless Power Transmission Over Full-Duplex OFDMA/NOMA Mobile Wireless Networks

The current wireless networks have been designed solely for data communication purposes, imposing many new challenges when supporting both power and information transmissions simultaneously. One of these main challenges lies in resource allocations. To overcome these difficulties, we propose the resource allocation schemes to efficiently support wireless power transmission over a relay-assisted full-duplex (FD) wireless network, where the access point (AP) conducts wireless information and power transfer (WIPT) to multiple mobile users in the downlink (DL), and in the meantime, mobile users transmit information to the AP via relays’ assistances in the uplink (UL). Under DL WIPT, each mobile user uses the power splitting technique to harvest energy and receive data simultaneously. Aiming at maximizing the minimum (max–min) sum of DL and UL transmit rates among all mobile users, our proposed schemes jointly optimize the allocation of subcarriers and powers, and the selection of relays and power splitting ratios. Also, our proposed schemes consider two scenarios, where the network employs either orthogonal frequency-division multiple access (OFDMA) or non-orthogonal multiple access (NOMA) taking into account both perfect channel state information (CSI) estimation and imperfect CSI estimation cases. We first approximate the formulated non-convex max–min optimization problems as convex optimization problems. Then, we develop an asymptotically optimal algorithm and a suboptimal algorithm for OFDMA case and NOMA case, respectively. Finally, we validate and evaluate the performances of our proposed schemes through numerical analyses.