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Energy efficiency maximization in the uplink Delta-Oma networks

Hashemi, R ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1109/TVT.2021.3097128
  3. Publisher: Institute of Electrical and Electronics Engineers Inc , 2021
  4. Abstract:
  5. Delta-orthogonal multiple access (D-OMA) has been recently investigated as a potential technique to enhance the spectral efficiency in the sixth-generation (6G) networks. D-OMA enables partial overlapping of the adjacent sub-channels that are assigned to different clusters of users served by non-orthogonal multiple access (NOMA), at the expense of additional interference. In this paper, we analyze the performance of D-OMA in the uplink and develop a multi-objective optimization framework to maximize the uplink energy efficiency (EE) in a multi-access point (AP) network enabled by D-OMA. Specifically, we optimize the sub-channel and transmit power allocations of the users as well as the overlapping percentage of the spectrum between the adjacent sub-channels. The formulated problem is a mixed binary non-linear programming problem. Therefore, to address the challenge we first transform the problem into a single-objective problem using Tchebycheff method. Then, we apply the monotonic optimization (MO) to explore the hidden monotonicity of the objective function and constraints, and reformulate the problem into a standard MO in canonical form. The reformulated problem can be solved by applying the outer polyblock approximation method. Our numerical results show that D-OMA outperforms the conventional non-orthogonal multiple access (NOMA) and orthogonal frequency division multiple access (OFDMA) when the adjacent sub-channel overlap and scheduling are optimized jointly. © 1967-2012 IEEE
  6. Keywords:
  7. Energy efficiency ; Multiobjective optimization ; Multiple access interference ; Nonlinear programming ; Orthogonal frequency division multiplexing ; Approximation methods ; Efficiency maximization ; Monotonic optimization ; Nonlinear programming problem ; Orthogonal frequency division multiple access ; Potential techniques ; Spectral efficiencies ; Transmit power allocation ; Frequency division multiple access
  8. Source: IEEE Transactions on Vehicular Technology ; Volume 70, Issue 9 , 2021 , Pages 9566-9571 ; 00189545 (ISSN)
  9. URL: https://ieeexplore.ieee.org/document/9485101