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Title: Exploiting constructive interference for simultaneous wireless information and power transfer in multiuser downlink systems
Authors: Timotheou, Stelios
Zheng, Gan
Masouros, Christos
Krikidis, Ioannis
Keywords: SWIPT
Constructive interference
Beamforming
Power splitting
MISO channel
Optimization
Issue Date: 2016
Publisher: © IEEE
Citation: TIMOTHEOU, S. ...et al., 2016. Exploiting constructive interference for simultaneous wireless information and power transfer in multiuser downlink systems. IEEE Journal on Selected Areas in Communications, 34 (5), pp. 1772 - 1784.
Abstract: In this paper we propose a power-efficient approach for information and energy transfer in multiple-input single output downlink systems. By means of data-aided precoding, we exploit the constructive part of interference for both information decoding and wireless power transfer. Rather than suppressing interference as in conventional schemes, we take advantage of constructive interference among users, inherent in the downlink, as a source of both useful information signal energy and electrical wireless energy. Specifically, we propose a new precoding design that minimizes the transmit power while guaranteeing the quality of service (QoS) and energy harvesting constraints for generic phase shift keying modulated signals. The QoS constraints are modified to accommodate constructive interference, based on the constructive regions in the signal constellation. Although the resulting problem is nonconvex, several methods are developed for its solution. First we derive necessary and sufficient conditions for the feasibility of the considered problem. Then we propose second-order cone programming and semi definite programming algorithms with polynomial complexity that provide upper and lower bounds to the optimal solution and establish the asymptotic optimality of these algorithms when the modulation order and SINR threshold tend to infinity. A practical iterative algorithm is also proposed based on successive linear approximation of the non-convex terms yielding excellent results. More complex algorithms are also proposed to provide tight upper and lower bounds for benchmarking purposes. Simulation results show significant power savings with the proposed data-aided precoding approach compared to the conventional precoding scheme.
Description: © 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Version: Accepted for publication
DOI: 10.1109/JSAC.2016.2551618
URI: https://dspace.lboro.ac.uk/2134/20803
Publisher Link: http://dx.doi.org/10.1109/JSAC.2016.2551618
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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