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<p>Non-orthogonal multiple access (NOMA) is a promising multiple access method that is being used for the fifth generation (5G) networks and beyond 5G (B5G) networks. NOMA allows multiple users in the network to be served in the same frequency band/time slot but with different power allocations. Compared to orthogonal multiple access (OMA) schemes, NOMA offers an improved overall system performance and spectrum efficiency for cellular communications systems. On the other hand, cooperative and relaying are important strategies in wireless communications to further improve overall performance. It allows a specific node to act as a relay, assisting the source node in sending its signal to a remote destination node. This paper presents an in-depth analysis of an uplink cooperative NOMA network, focusing on a scenario in which two users communicate with a base station via two Decode-and-Forward (DF) half-duplex relays. The network operates over frequency-selective Rayleigh fading channels, introducing a realistic, complex communication environment. We derived new closed-form expressions to evaluate the ergodic rate performance of the two users. Additionally, we extended our analysis to scenarios in which the two relays are in motion. This highlights the dynamic impact of relay mobility on the network’s performance. We also emphasize the critical role of key parameters such as <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\alpha\)</EquationSource> </InlineEquation>, <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\beta\)</EquationSource> </InlineEquation>, <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\omega\)</EquationSource> </InlineEquation>, and <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(\Omega\)</EquationSource> </InlineEquation>, which influence the power allocation and channel conditions. By carefully optimizing these coefficients, the network can balance performance and fairness between users. Simulation results reinforce the advantages of NOMA over OMA techniques. This performance boost underscores NOMA’s potential to enhance spectral efficiency and meet the demands of modern communication systems, especially in environments with frequency-selective fading and mobility.</p>

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Ergodic Sum Rate Analysis in Multi-Hop Uplink NOMA Network with Statistical CSI and Mobile Relays

  • 期刊论文

  • 发表日期：

    2026年2月17日

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  • Sharief Abdel-Razeq,
  • Sonia Alshraideh,
  • Haythem Bany Salameh

摘要

Non-orthogonal multiple access (NOMA) is a promising multiple access method that is being used for the fifth generation (5G) networks and beyond 5G (B5G) networks. NOMA allows multiple users in the network to be served in the same frequency band/time slot but with different power allocations. Compared to orthogonal multiple access (OMA) schemes, NOMA offers an improved overall system performance and spectrum efficiency for cellular communications systems. On the other hand, cooperative and relaying are important strategies in wireless communications to further improve overall performance. It allows a specific node to act as a relay, assisting the source node in sending its signal to a remote destination node. This paper presents an in-depth analysis of an uplink cooperative NOMA network, focusing on a scenario in which two users communicate with a base station via two Decode-and-Forward (DF) half-duplex relays. The network operates over frequency-selective Rayleigh fading channels, introducing a realistic, complex communication environment. We derived new closed-form expressions to evaluate the ergodic rate performance of the two users. Additionally, we extended our analysis to scenarios in which the two relays are in motion. This highlights the dynamic impact of relay mobility on the network’s performance. We also emphasize the critical role of key parameters such as \(\alpha\) , \(\beta\) , \(\omega\) , and \(\Omega\) , which influence the power allocation and channel conditions. By carefully optimizing these coefficients, the network can balance performance and fairness between users. Simulation results reinforce the advantages of NOMA over OMA techniques. This performance boost underscores NOMA’s potential to enhance spectral efficiency and meet the demands of modern communication systems, especially in environments with frequency-selective fading and mobility.