A Harvested Power-Oriented SWIPT Scheme in MIMO Communication Systems with Non-Linear Harvesters

Yan CHEN  Chen LIU  Mujun QIAN  Yu HUANG  Wenfeng SUN  

Publication
IEICE TRANSACTIONS on Communications   Vol.E104-B    No.7    pp.893-902
Publication Date: 2021/07/01
Publicized: 2021/01/18
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2020EBP3099
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
Keyword: 
non-linear and linear energy harvesting model,  simultaneous wireless information and power transfer,  harvested power maximization,  iterative optimization solution,  sum-of-ratios programming,  

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Summary: 
This paper studies a harvested power-oriented simultaneous wireless information and power transfer (SWIPT) scheme over multiple-input multiple-output (MIMO) interference channels in which energy harvesting (EH) circuits exhibit nonlinearity. To maximize the power harvested by all receivers, we propose an algorithm to jointly optimize the transmit beamforming vectors, power splitting (PS) ratios and the receive decoding vectors. As all variables are coupled to some extent, the problem is non-convex and hard to solve. To deal with this non-convex problem, an iterative optimization method is proposed. When two variables are fixed, the third variable is optimized. Specifically, when the transmit beamforming vectors are optimized, the transferred objective function is the sum of several fractional functions. Non-linear sum-of-ratios programming is used to solve the transferred objective function. The convergence and advantage of our proposed scheme compared with traditional EH circuits are validated by simulation results.