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Beamforming optimization for full-duplex wireless-powered MIMO systems

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posted on 08.11.2017 by Batu K. Chalise, Himal A. Suraweera, Gan Zheng, George K. Karagiannidis
We propose techniques for optimizing transmit beamforming in a full-duplex multiple-input-multiple-output wireless-powered communication system, which consists of two phases. In the first phase, the wireless-powered mobile station (MS) harvests energy using signals from the base station (BS), whereas in the second phase, both MS and BS communicate to each other in a full-duplex mode. When complete instantaneous channel state information (CSI) is available, the BS beamformer and the time-splitting (TS) parameter of energy harvesting are jointly optimized in order to obtain the BS-MS rate region. The joint optimization problem is non-convex, however, a computationally efficient optimum technique, based upon semidefinite relaxation and line-search, is proposed to solve the problem. A sub-optimum zero-forcing approach is also proposed, in which a closed-form solution of TS parameter is obtained. When only the second-order statistics of transmit CSI is available, we propose to maximize the ergodic information rate at the MS while maintaining the outage probability at the BS below a certain threshold. An upper bound for the outage probability is also derived and an approximate convex optimization framework is proposed for efficiently solving the underlying non-convex problem. Simulations demonstrate the advantages of the proposed methods over the sub-optimum and half-duplex ones.

Funding

The work of G. Zheng was supported by the UK EPSRC under grant number EP/N007840/1. The work of G. K. Karagiannidis has been supported by the “Research Projects for Excellence IKY/Siemens.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

IEEE Transactions on Communications

Volume

65

Issue

9

Pages

3750 - 3764

Citation

CHALISE, B.K. ... et al., 2017. Beamforming optimization for full-duplex wireless-powered MIMO systems. IEEE Transactions on Communications, 65 (9), pp. 3750 - 3764.

Publisher

IEEE

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VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 3.0 Unported (CC BY 3.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/by/3.0/

Acceptance date

08/05/2017

Publication date

2017

Notes

This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see http://creativecommons.org/licenses/by/3.0/

ISSN

0090-6778

Language

en

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