Joint Beamforming Design and Time Allocation for Wireless Powered Communication Networks
- 14 August 2014
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Communications Letters
- Vol. 18 (10), 1783-1786
- https://doi.org/10.1109/lcomm.2014.2347958
Abstract
This paper investigates a multi-input single-output (MISO) wireless powered communication network (WPCN) under the protocol of harvest-then-transmit. The power station (PS) with reliable power supply first replenishes the passive user nodes by radio-frequency wireless power transfer (WPT) in the downlink, then each user node transmits independent information to the sink by a time division multiple access (TDMA) scheme in the uplink. We consider the joint time allocation and beamforming design to maximize the system sum-throughput. With perfect channel station information (CSI) at the PS, a semi-closed form solution is proposed by exploiting the strict concavity of the joint design problem. Then, in the case with Gaussian CSI errors, a robust algorithm is proposed to maximize the system throughput subject to the signal-to-noise ratio (SNR) outage probability constraints. Simulation results demonstrate the efficiency of the proposed fast algorithm and validate the robust algorithm.Funding Information
- Fundamental Research Funds for the Central Universities (2014JBM153)
- China Postdoctoral Science Foundation (2013M530519)
- State Key Lab of Rail Traffic Control and Safety (RCS2014ZQ004)
- State Key Laboratory of Integrated Services Networks, Xidian University (ISN14-09)
- Natural Science Foundation of China (U1334202)
- Key Grant Project of Chinese Ministry of Education (313006)
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