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Simultaneous Wireless Information and Power Transfer with Finite-Alphabet Inputs

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Abstract

Simultaneous wireless information and power transfer (SWIPT) is a promising solution to carry energy as well as information at the same time for wireless networks. In this paper, we consider a precoding matrix design for multiple-input multiple-output (MIMO) SWIPT systems with finite-alphabet inputs. The problem can be formulated as maximizing the mutual information given the energy level and the power constraint for achieving a so-called rate-energy region. The formulated problem is non-concave, which can be reduced to a convex power allocation problem by the proposed gradient-descend design of the precoding matrix. Several rate-energy regions can be achieved by trading off between the information rate and the harvested energy with different schemes. Simulation results indicate that the proposed scheme with finite-alphabet inputs provides significant performance gain over existing schemes with Gaussian inputs.

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Authors and Affiliations

  1. School of Electronic and Information Engineering, South China University of Technology, Guangzhou, 510641, Guangdong, China

    Feng Ke, Xiaoyu Huang, Yuan Liu & Suili Feng

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  1. Feng Ke
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  2. Xiaoyu Huang
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  3. Yuan Liu
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  4. Suili Feng
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Correspondence to Feng Ke.

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Ke, F., Huang, X., Liu, Y. et al. Simultaneous Wireless Information and Power Transfer with Finite-Alphabet Inputs. Wireless Pers Commun 96, 655–668 (2017). https://doi.org/10.1007/s11277-017-4194-3

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  • DOI: https://doi.org/10.1007/s11277-017-4194-3

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