Targeted at the problem of energy efficiency (EE) optimization in simultaneous wireless information and power transfer (SWIPT), this paper considers using an optimization algorithm based on time reversal (TR) to maximize the energy efficiency of the system under the condition of satisfying certain communication service quality and collecting energy. First, the time reversal is introduced into simultaneous wireless information and power transfer to construct a new transmission scheme, and the closed expression of energy efficiency is analyzed. Next, through analyzing and planning the problem, it is found that the optimization problem is a two-element fractional non-convex programming problem which needs to be transformed into a convex optimization problem by mathematical transformation. Finally, the solution of the problem is obtained by using the Dinkelbach algorithm and CVX. The simulation results show that the optimized energy efficiency will increase when the decoding noise power, the maximum transmission power, and the signal-to-noise ratio increase. The optimization algorithm based on time reversal can significantly increase the energy efficiency when the constraints are satisfied.
CHEN Shanxue, LIU Zuoliang, LI Fangwei
. Energy Efficiency Optimization Based on Time Reversal in SWIPT[J]. Journal of Shanghai Jiaotong University, 2020
, 54(6)
: 592
-598
.
DOI: 10.16183/j.cnki.jsjtu.2018.080
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