Energy and spectral efficiency tradeoff in NOMA: Multi-objective evolutionary approaches

Cetinkaya S., Arslan H.

2020 IEEE International Conference on Communications Workshops, ICC Workshops 2020, Dublin, Ireland, 7 - 11 June 2020, (Full Text) identifier

  • Publication Type: Conference Paper / Full Text
  • Doi Number: 10.1109/iccworkshops49005.2020.9145261
  • City: Dublin
  • Country: Ireland
  • Keywords: Energy efficiency, Multi-objective evolutionary algorithms, Non-orthogonal multiple access (NOMA), Power allocation, Spectral efficiency
  • Istanbul Medipol University Affiliated: Yes

Abstract

Non-orthogonal multiple access (NOMA) deployment in future wireless networks has been recently considered a promising radio access technology to enhance spectral efficiency (SE). However, gain in SE comes always with the cost of energy efficiency (EE). In this paper, we investigate the SE and EE tradeoff in downlink NOMA with the consideration of quality of service (QoS) requirements based on three population-based multi-objective evolutionary algorithms (MOEAs): multi-objective particle swarm optimization (MOPSO), non-dominated sorting genetic algorithm-II (NSGA-II) and strength Pareto evolutionary algorithm-2 (SPEA2). The tradeoff is optimized and Pareto optimal solutions are obtained through MOEAs. The effectiveness of the algorithms is evaluated based on the hypervolume metric and the capability of solving multi-objective optimization problems. Simulation results reveal that SPEA2 outperforms NSGA-II and MOPSO. Furthermore, NSGA-II is the loser among all algorithms in terms of finding Pareto optimal results.