Rate-Energy Region of SWIPT for MIMO Broadcasting Under Nonlinear Energy Harvesting Model

This paper explores the rate-energy (R-E) region of simultaneous wireless information and power transfer for MIMO broadcasting channel under the nonlinear radio frequency energy harvesting (EH) model. The goal is to characterize the tradeoff between the maximal energy transfer versus information rat...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2017-08, Vol.16 (8), p.5147-5161
Main Authors: Ke Xiong, Beibei Wang, Liu, K. J. Ray
Format: Article
Language:English
Subjects:
Broadcasting
Decoding
E region
Energy harvesting
Energy transfer
Exact solutions
Integrated circuit modeling
Mathematical models
MIMO
nonlinear energy harvesting model
Power transfer
rate-energy region
rate-energy tradeoff
Receivers
RF signals
Simultaneous wireless information and power transfer
Switching
Tradeoffs
Transmitters
Wireless communication
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Summary:This paper explores the rate-energy (R-E) region of simultaneous wireless information and power transfer for MIMO broadcasting channel under the nonlinear radio frequency energy harvesting (EH) model. The goal is to characterize the tradeoff between the maximal energy transfer versus information rate. The separated EH and information decoding (ID) receivers and the co-located EH and ID receivers scenarios are considered. For the co-located receivers scenario, both time switching (TS) and power splitting (PS) receiver architectures are investigated. Optimization problems are formulated to derive the boundaries of the R-E region s for the considered systems. As the problems are nonconvex, we first transform them into equivalent ones and derive some semi-closed-form solutions, and then design efficient algorithms to solve them. Numerical results are provided to show the R-E region s of the systems, which provide some interesting insights. It is shown that all practical circuit specifications greatly affect the system R-E region. Compared with the systems under traditional linear EH model, the ones under the nonlinear EH model achieve smaller R-E region s due to the limitations of practical circuit features and also show very different R-E tradeoff behaviors.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2017.2706277