Open Access
ARTICLE
Rate-Energy Tradeoff for Wireless Simultaneous Information and Power Transfer in Full-Duplex and Half-Duplex Systems
Xiaoye Shi1, *, Jin Sun1, Dongming Li1, Fei Ding2, Zhaowei Zhang1
1 Department of Internet of Things, Nanjing University of Posts and Telecommunications, Nanjing, 210003, China.
2 Department of Electronic and Electrical Engineering, University College London, London, WC1E 6BT, UK.
* Corresponding Author: Xiaoye Shi. Email: .
Computers, Materials & Continua 2020, 65(2), 1373-1384. https://doi.org/10.32604/cmc.2020.011018
Received 01 May 2020; Accepted 01 June 2020; Issue published 20 August 2020
Abstract
In this paper, we study the rate-energy tradeoff for wireless simultaneous information and power transfer in full-duplex and half-duplex scenarios. To this end, the
weighting function of energy efficiency and transmission rate, as rate-energy tradeoff
metric is first introduced and the metric optimization problem is formulated. Applying
Karush-Kuhn-Tucker (KKT) conditions for Lagrangian optimality and a series of
mathematical approximations, the metric optimization problem can be simplified. The
closed-form solution of the power ratio is obtained, building direct relationship between
power ratio and the rate-energy tradeoff metric. By choosing power ratio, one can make
the tradeoff between information rate and harvested power in a straightforward and
efficient way. Using the method similar to the half duplex systems, the optimal power
ratio can be obtained in the full duplex systems, so as to balance the information
transmission rate and energy transmission efficiency. Simulation results validate that the
information rate is non-increasing with harvested power in half-duplex systems and the
tradeoff of information rate and harvested power can be simply made. In the full duplex
systems, the power ratio solution of the rate-energy tradeoff metric optimization problem
can be used as the approximate optimal solution of the optimization problem and the
approximation error is negligible.
Keywords
Cite This Article
X. Shi, J. Sun, D. Li, F. Ding and Z. Zhang, "Rate-energy tradeoff for wireless simultaneous information and power transfer in full-duplex and half-duplex systems,"
Computers, Materials & Continua, vol. 65, no.2, pp. 1373–1384, 2020. https://doi.org/10.32604/cmc.2020.011018
Citations