Abstract
This paper evaluates the performance of a wireless powered communications system, where an energy-aware relay can ability of controlling proper energy harvesting parameters for obtaining maximal throughput. Considering a power splitting approach, the relay first can calculate percentage of harvested wireless energy from power supply source, and then transmits information to the destination. This paper proposes the dynamic harvesting power allocation policy for energy harvesting and analytical expressions for the delay-limited and delay-tolerant throughput related to amplify-and-forward relaying mode. In particular, the optimal power coefficients can be derived in closed-form expressions, in which the maximal throughput can be obtained in special case, i.e., high transmit power regime. In addition, the impact of transmit power, power splitting fraction, the fixed rate factors, noise levels are well studied. Simulation results validate the theoretical expressions and show the effectiveness of the proposed policy.
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Appendix
Appendix
Proof of Proposition 2
The outage probability can be computed by
where \(L={\beta \eta \left| g \right| ^2 d_1^m \sigma _R^2 + d_1^m d_2^m \sigma _D^2 \left( {1 - \beta } \right) }\). It can be re-expressed by
in which \(h_1\) and \(h_2\) are outcomes of the function below
and \(h_1\) and \(h_2\) are determined by
where
Due to \(h_1 <0\), the given outage probability can be rewritten as
Thus, we obtain new expression as
This is end of Proof of Proposition 2 by averaging value of channel gain of h.
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Do, DT. Optimal Energy Harvesting Strategy in Relaying Networks: Dynamic Allocation Scheme and Performance Analysis. Wireless Pers Commun 108, 1097–1111 (2019). https://doi.org/10.1007/s11277-019-06456-1
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DOI: https://doi.org/10.1007/s11277-019-06456-1