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Non-orthogonal Multiple Access Techniques with Simultanious Wireless Information and Energy Transfer

Eslami Manoochehri, Farzad | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51105 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): MirMohseni, Mahtab; Nasiri Kenari, Masumeh
  7. Abstract:
  8. Non-Orthogonal multiple access (NOMA) has been considered as a promising multiple access technique for the 5th generation (5G) of wireless networks. In contrast to orthogonal multiple access, NOMA supports more than one user in each subchannel and thus, improve spectral efficiency. On the other hand, energy efficiency which is another key consideration in future 5G networks, can be improved by energy harvesting (EH) methods. In the NOMA scheme, the user with the better channel condition performs successive interference cancellation (SIC) to detect the data of the user with the worse channel condition and then subtract it from the received signal to decode its own data. Since the data of the poor user is available in the receiver of strong user, the strong user can act as a decode-and-forward relay. Meanwhile, the energy required for relaying can be provided through wireless EH. Thus, simultaneous wireless information and power transfer (SWIPT) can be employed to make the user with the better channel condition capable of relaying. We consider a downlink multi-user cooperative NOMA-SWIPT system and our aim is to assign the subchannel to the pairs, allocate the transmission power of the BS to users such that a minimum data rate is guaranteed for the users with the better channel condition and the rates of the users with worse channel condition are maximized. The formulation leads to a highly non-convex optimization problem. Thus, we develop an algorithm in which the subchannel assignment and power allocation are solved in two subproblems iteratively
  9. Keywords:
  10. Power Allocation ; Decode and Forward ; Outage Probability ; Non-Orthogonal Multiple Access ; Simultaneous Wireless Information and Power Transfer ; Nonconvex Optimization

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