[en] This letter investigates the employment of vector-perturbation (VP) precoding to convey simultaneously informa-tion and energy in multiple-user multiple-input single-output(MU-MISO) downlink channel. We show that the conventionalVP in addition to the information capacity benefits that providesto linear channel inversion techniques, it enhances the harvestedenergy at the receivers due to the extended symbol constellation.To further boost harvesting performance, a modified VP tech-nique (named VP-EH) is proposed that designs the VP integeroffsets such as to maximize the delivered power. The proposedscheme incorporates an integer least square problem to find theclosest lattice point to a point which is given by a Rayleighquotient optimization problem. Finally, a convex combinationbetween conventional VP and VP-EH is proposed to achieve atrade-off between maximizing information or energy. Theoreticaland simulations results validate that VP is a promising techniqueto simultaneously convey information and energy in MU-MISOsystems.
[University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom >]
