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<p>With the rapid evolution of wireless communication, Non-orthogonal multiple access (NOMA) becomes an ideal technology to accommodate the increasing number of devices over limited spectrum. In order to make the wireless networks sustainable, simultaneous wireless information and power transfer (SWIPT) has been imported into NOMA network. In this paper, in order to further improve the spectrum efficiency in the infrastructure based NOMA network over Rayleigh fading channels, a SWIPT-enabled two-way relay (TWR) is introduced. A three-phase data exchange scheme based on hybrid relaying protocol combining power splitting (PS) with time splitting (TS) protocol (HPTSR) is proposed. Then, we derive the closed expressions of outage probability for the near user and the far user. Further, an optimization problem for a lower system outage probability under the constraints of power allocation factor and time allocation factor is proposed. Moreover, an iterative algorithm is designed. Finally, through numerical simulation, our simulation results outperform baseline benchmarks.</p>

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Outage Performance Optimization for Two-Way-Relay-Aided Cooperative NOMA with SWIPT

  • 期刊论文

  • 发表日期：

    2025年3月1日

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  • Lin Kang,
  • Yanjun Zhu,
  • Yifeng Chen,
  • Lei Zhang,
  • Yaqi Wei

摘要

With the rapid evolution of wireless communication, Non-orthogonal multiple access (NOMA) becomes an ideal technology to accommodate the increasing number of devices over limited spectrum. In order to make the wireless networks sustainable, simultaneous wireless information and power transfer (SWIPT) has been imported into NOMA network. In this paper, in order to further improve the spectrum efficiency in the infrastructure based NOMA network over Rayleigh fading channels, a SWIPT-enabled two-way relay (TWR) is introduced. A three-phase data exchange scheme based on hybrid relaying protocol combining power splitting (PS) with time splitting (TS) protocol (HPTSR) is proposed. Then, we derive the closed expressions of outage probability for the near user and the far user. Further, an optimization problem for a lower system outage probability under the constraints of power allocation factor and time allocation factor is proposed. Moreover, an iterative algorithm is designed. Finally, through numerical simulation, our simulation results outperform baseline benchmarks.