Resource Allocation for Energy-Efficient NOMA System in Coordinated Multi-Point Networks

Alemu Jorgi Muhammed, Zheng Ma, Zhiguo Ding, Ming Xiao, Pingzhi Fan, Weiqiang Xu, Gang Liu, Zhengquan Zhang

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

This paper studies user scheduling and power allocation problem to maximize the energy efficiency (EE) for non-orthogonal multiple access (NOMA) in downlink Coordinated Multi-Point networks. In the proposed framework, a more practical scenario the imperfect channel state information, imperfect successive interference cancellation and data outage are investigated. To address the considered problem, the optimization problem is formulated constrained by the total power and the outage probability requirements. However, the EE objective function is with a non-convex structure. Accordingly, we first convert the optimization problem to make the objective function concave and analytically tractable. Furthermore, we split the joint optimization problem to find a suboptimal solutions to the original problem. As a result, we first propose a suboptimal user-scheduling algorithm to improve the system's EE. Due to the non-convex function of the transmit power, we invoke a sequential successive convex approach to address the non-convex problem by its lower bound concave function. Besides, the fractional objective function is converted to its equivalent subtractive form. Finally, we derive a power control scheme to address the proposed framework. Simulation results endorse the effectiveness of the proposed algorithm and their performance gains in terms of EE compared to both NOMA and OFDMA variants.

Original languageBritish English
Article number9336309
Pages (from-to)1577-1591
Number of pages15
JournalIEEE Transactions on Vehicular Technology
Volume70
Issue number2
DOIs
StatePublished - Feb 2021

Keywords

  • energy efficiency
  • NOMA
  • outage probability
  • power allocation
  • Successive interference cancellation

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