Improving Performance of Far Users in Cognitive Radio: Exploiting NOMA and Wireless Power Transfer
Abstract
:1. Introduction
- Reliable transmission of AF relaying scheme required in such CR-NOMA system with a common relay and EH policy was studied. This implementation of two schemes is designed to satisfy the users’ condition in terms of channel quality with respect to the more reliable transmitted information. We intend to analyze the system performance of EH assisted CR-NOMA networks through the Rayleigh fading channels.
- The exact expressions of outage probability is presented and then throughput is further examined. From the achieved results, we analyze the effects of a number of factors including power allocation factors, transmit SNR, and the number of relays to prove the superiority of such CR NOMA model.
- As extended model, multiple relay selection in Scheme 2 is introduced in EH assisted CR NOMA to increase data rate and reliability of transmission compared to singe relay systems reported in Scheme 1. Moreover, the EH assisted CR-NOMA systems illustrate an improved performance as increasing the number of selected relays.
2. System Model
3. Performance Analysis in Scheme 1
3.1. Calculation of SNR
3.2. Outage and Throughput Performance Analysis
- If
- If
- If
- If
3.3. Consideration on Overall Performance in Terms of Outage Behavior and Throughput
4. Performance Analysis in Scheme 2
- If
- If
- If
- If
5. Simulation Results
6. Conclusions
Author Contributions
Funding
Conflicts of Interest
Appendix A. Proof of Proposition 1
Appendix B. Proof of Proposition 3
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Van Nguyen, M.-S.; Do, D.-T.; Voznak, M. Improving Performance of Far Users in Cognitive Radio: Exploiting NOMA and Wireless Power Transfer. Energies 2019, 12, 2206. https://doi.org/10.3390/en12112206
Van Nguyen M-S, Do D-T, Voznak M. Improving Performance of Far Users in Cognitive Radio: Exploiting NOMA and Wireless Power Transfer. Energies. 2019; 12(11):2206. https://doi.org/10.3390/en12112206
Chicago/Turabian StyleVan Nguyen, Minh-Sang, Dinh-Thuan Do, and Miroslav Voznak. 2019. "Improving Performance of Far Users in Cognitive Radio: Exploiting NOMA and Wireless Power Transfer" Energies 12, no. 11: 2206. https://doi.org/10.3390/en12112206