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Improving Throughput and Secrecy Throughput Performance in Wireless Powered Communication Networks

Rezaei Estakhrooeieh, Roohollah | 2020

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 53415 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Pakravan, Mohammad Reza
  7. Abstract:
  8. In wireless powered communication networks (WPCNs), wireless nodes are charged via an access point. In these networks, an access point transfers power to the nodes, and then, the nodes use the received power to transmit their information to the access point. Due to the wireless transmission of the information, eavesdropping of it is an important vulnerability in these networks. The conventional method to resolve this security problem is using cryptography algorithms. However, this method needs key management and complex encryption algorithms to be used by the nodes, which may not be applicable. Physical layer security (PLS), which uses the channel characteristics, is a more suitable way to increase the secrecy rate in WPCNs. In this thesis, we first consider a typical WPCN. In this network, average throughput of the nodes is maximized subject to the constraints on fairness, quality-of-service (QoS), the average, and peak power transmission level of the AP. The proposed general framework includes several well-known fairness criteria such as max-min and proportional fairness. Numerical simulations show that the proposed framework obtains an increment of O(logN) in the throughput of the network, where N indicates the number of the antennas of the access point. Afterwards, we consider eavesdropping in WPCNs, and PLS is used to reduce this vulnerability. In the proposed solution, the rate of the main channel is increased via beamforming in the access point. In addition, the energy signal of the access point is used as artificial noise to reduce the quality of the eavesdropping channel. As we show, this technique increases the secrecy rate.
  9. Keywords:
  10. Wireless power Transfer ; Fairness ; Service Quality ; Physical Layer Security ; Directionality ; Convex Optimization ; Optimization ; Artificial Noise Forwarding ; Wireless Powered Communication Networks

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