Vector Perturbation Channel Inversion for SWIPT MU-MISO Systems

This letter investigates the employment of vector-perturbation (VP) precoding to convey simultaneously information and energy in multiple-user multiple-input single-output (MU-MISO) downlink channel. We show that conventional VP addition capacity benefits provides linear channel inversion techniques, it enhances harvested at receivers due extended symbol constellation. To further boost harvesting performance, proposed modified technique (named VP-EH) designs integer offsets order maximize delivered power. The scheme incorporates an least square problem find closest lattice point a which is given by Rayleigh quotient optimization problem. Finally, convex combination between VP-EH achieve trade-off maximizing or energy. Theoretical simulations results validate promising MU-MISO systems.