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Non-orthogonal multiple access (NOMA) based coordinated direct and relay transmission (CDRT) is recognized as one of the enabling technologies for effectively enhancing spectral efficiency and coverage range in mobile communication systems. However, most conventional NOMA based CDRT schemes only support cellular data transmission. To simultaneously support both cellular and Internet of Things (IoT) data transmission and further improve the spectral efficiency of the system, this paper proposes a novel bidirectional backscatter NOMA scheme for CDRT systems. Specifically, the proposed scheme utilizes both uplink NOMA and downlink NOMA to facilitate the sharing of spectrum and time resources between cellular information and IoT data reflected by users. To accurately characterize the effectiveness of the proposed scheme, the closed-form expressions for the ergodic sum capacity (ESC) are derived. Simulation experiments validate the correctness of theoretical analysis and demonstrate that the proposed scheme can achieve better ESC performance than the conventional NOMA based CDRT and orthogonal multiple access.

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Bidirectional Backscatter NOMA Schemefor Efficient CDRT Systems

  • 会议论文

  • 发表日期：

    2025年

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  • Rongfei Hu,
  • Yao Xu,
  • Jianyue Zhu,
  • Jichong Guo,
  • Shaobo Jia,
  • Yi Lou,
  • Chengzhao Shan

摘要

Non-orthogonal multiple access (NOMA) based coordinated direct and relay transmission (CDRT) is recognized as one of the enabling technologies for effectively enhancing spectral efficiency and coverage range in mobile communication systems. However, most conventional NOMA based CDRT schemes only support cellular data transmission. To simultaneously support both cellular and Internet of Things (IoT) data transmission and further improve the spectral efficiency of the system, this paper proposes a novel bidirectional backscatter NOMA scheme for CDRT systems. Specifically, the proposed scheme utilizes both uplink NOMA and downlink NOMA to facilitate the sharing of spectrum and time resources between cellular information and IoT data reflected by users. To accurately characterize the effectiveness of the proposed scheme, the closed-form expressions for the ergodic sum capacity (ESC) are derived. Simulation experiments validate the correctness of theoretical analysis and demonstrate that the proposed scheme can achieve better ESC performance than the conventional NOMA based CDRT and orthogonal multiple access.