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α = 0.1. In order to improve the performance of this system, we can allocate more transmit power for the worse user's message (i.e., sn). However, at that time the power which leaves for the better user's message (i.e., sm) will be smaller, and it

Pout with and without relay vs. average transmit SNR of P with different numbers of users M with γ<sup>S</sup> = 20 dB, an = 0.9, m = 2, n = 3, Ω = 1 bps/Hz, α = 0.3, η = 0.9, dPDm = dPR = dSDm = dSR = dmn = dRDn = 1, θ = 2.

In addition, Figure 11 plots the curves of Pout with and without relay versus average transmit SNR of power station P with different numbers of users M. In this figure, we can observe that Pout of relaying scheme is lower than Pout without relaying. In other words, this result confirms that relaying method can improve the

Finally, we can observe from the above figures that the analysis and simulation

In this chapter, we have presented the performance analysis of downlink RF-EH NOMA relaying network with triple-phase harvest-transmit-forward transmission protocol in terms of outage probability and throughput. The exact closed-form expressions of outage probability and throughput for this proposed system have been derived. We have found that the performance of this considered system is enhanced by applying relaying technique or increasing the transmit power for energy harvesting and/or increasing the transmit power for information transmission. Moreover, the existence of best time switching ratio is proven to achieve the optimal performance of this system. We will solve the best time switching ratio

1.

results are good matching. This confirms the correctness of our analysis.

should satisfy an/am > 22Ω/(1<sup>α</sup>)

Recent Wireless Power Transfer Technologies

5. Conclusions

116

Figure 11.

performance of this considered system.

searching problem in the future work.

Dac-Binh Ha<sup>1</sup> \* and Jai P. Agrawal<sup>2</sup>

1 Duy Tan University, Da Nang, Vietnam

2 Purdue University Northwest, Hammond, IN, USA

\*Address all correspondence to: hadacbinh@duytan.edu.vn

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
