Energy-Efficient Power Allocation for MIMO-NOMA with Multiple Users in a Cluster

Ming Zeng, Animesh Yadav, Octavia A. Dobre, H. Vincent Poor

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

In this paper, energy-efficient power allocation (PA) is investigated for a multiple-input multiple-output non-orthogonal multiple access system with multiple users in a cluster. To ensure the quality of service (QoS) for the users, a minimum rate requirement is pre-defined for each user. Because of the QoS requirement, it is first necessary to determine whether the considered energy-efficiency (EE) maximization problem is feasible or not, by comparing the total transmit power with the required power for satisfying the QoS of the users. If feasible, a closed-form solution is provided for the corresponding sum rate maximization problem, and on this basis, the EE maximization problem is solved by applying non-convex fractional programming. Otherwise, a low-complexity user admission scheme is proposed, which admits users one by one following the ascending order of the required power for satisfying the QoS. Numerical results are presented to validate the effectiveness of the proposed energy-efficient PA strategy and user admission scheme.

Original languageEnglish (US)
Pages (from-to)5170-5181
Number of pages12
JournalIEEE Access
Volume6
DOIs
StatePublished - Feb 22 2018

All Science Journal Classification (ASJC) codes

  • Computer Science(all)
  • Materials Science(all)
  • Engineering(all)

Keywords

  • Non-orthogonal multiple access (NOMA)
  • energy efficiency (EE)
  • multiple-input multiple-output (MIMO)
  • power allocation (PA)
  • quality-of-service (QoS)
  • user admission

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