Low Complexity User Selection and Power Allocation for Uplink NOMA Beamforming Systems

Yu Hsin Chen, Yung Fang Chen, Shu Ming Tseng, Der Feng Tseng

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

In this paper, we develop user selection and power allocation methods for NOMA systems equipped with multi-antenna to enhance the sum capacity of the uplink. The system has the base station (BS) with N antenna supporting 2N users in the same spectrum resource simultaneously, and successive interference cancellation (SIC) is applied at the BS. Because the superposition of multiple users in transmission within the same frequency resource block leads to the interference among users, we derive a user set selection algorithm and a suboptimal power control to mitigate the interference effect and to maximize the sum capacity. The user set selection algorithm is first applied by comparing the designed indicator which balances the factors affecting the sum capacity of the uplink. Second, the derived suboptimal power assignment algorithm is utilized with power control factors where four cases are evaluated. The simulation results show that the proposed schemes can significantly improve the sum capacity than the existing methods.

Original languageEnglish
Pages (from-to)1413-1429
Number of pages17
JournalWireless Personal Communications
Volume111
Issue number3
DOIs
StatePublished - 1 Apr 2020

Keywords

  • Beamforming
  • Co-channel interference
  • Non-orthogonal multiple access (NOMA)
  • Power control
  • Resource allocation

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