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In this paper, we consider a multiple-input multiple-output wireless poweredcommunication network (MIMO-WPCN), where multiple users harvest energy from adedicated power station in order to be able to transmit their informationsignals to an information receiving station. Employing a practical non-linearenergy harvesting (EH) model, we propose a joint time allocation and powercontrol scheme, which takes into account the uncertainty regarding the channelstate information (CSI) and provides robustness against imperfect CSIknowledge. In particular, we formulate two non-convex optimization problems fordifferent objectives, namely system sum throughput maximization andmaximization of the minimum individual throughput across all wireless poweredusers. To overcome the non-convexity, we apply several transformations alongwith a one-dimensional search to obtain an efficient resource allocationalgorithm. Numerical results reveal that a significant performance gain can beachieved when the resource allocation is designed based on the adoptednon-linear EH model instead of the conventional linear EH model. Besides,unlike a non-robust baseline scheme designed for perfect CSI, the proposedresource allocation schemes are shown to be robust against imperfect CSIknowledge.

Robust Resource Allocation for MIMO Wireless Powered Communication Networks Based on a Non-linear EH Model