The wireless power transfer (WPT) is a controllable and promising way to solve the energy scarcity problem of the devices in wireless networks. The non-orthogonal multiple access (NOMA) scheme is a new multiple access technique
which has been proposed to provide higher spectral efficiency (SE) and support massive user accesses. A wireless powered NOMA network consisting of one multiple-antenna power station
multiple single-antenna users and one single-antenna information receiver is considered. In the downlink
the power station transfers wireless energy to the users
while in the uplink
the users transmit their information to the information receiver in the NOMA manner. A practical scenario where the power station knows imperfect channel state information (CSI) of the downlink channel is viewed
and a robust resource allocation algorithm is proposed to jointly optimize the beamforming of the power station
the transmit powers of the users
and the time lengths of the downlink and uplink in order to maximize the throughput of the system. Simulation results show that the proposed robust design algorithm achieves significantly higher throughput than the non-robust benchmark scheme.
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