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Positioning Performance Optimization for Reconfigurable Intelligent Surface Assisted NOMA System
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Xiaorong DUAN1, Junwei MA1, Min ZHAO1, Delu ZHANG2, Meiling LI2, *
Radio Communications Technology | 2025, 51(5) : 967 - 975
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Radio Communications Technology | 2025, 51(5): 967-975
• Special Topic: 6G and IoT Technologies •
Positioning Performance Optimization for Reconfigurable Intelligent Surface Assisted NOMA System
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Xiaorong DUAN1, Junwei MA1, Min ZHAO1, Delu ZHANG2, Meiling LI2, *
Affiliations
  • 1.Information and Communications Branch, State Grid Shanxi Electric Power Company, Taiyuan 030021, China
  • 2.School of Electronic Information Engineering, Taiyuan University of Seience and Technology, Taiyuan 030024, China
Published: 2025-09-18 doi: 10.3969/j.issn.1003-3114.2025.05.010
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In smart grids, the presence of numerous high-power electrical devices and communication sensing equipment severely hinders signal transmission in positioning systems. To address the challenge of accurately locating weak signals in a Reconfigurable Intelligent Surface (RIS)-assisted Non-Orthogonal Multiple Access (NOMA) system under interference from multiple base stations and communication users, this paper considers the impact of multiple small base stations and multiple users in a smart grid environment. A horizontal positioning error of the target user is used as the evaluation metric. While ensuring the Quality of Service (QoS) for communication users, the proposed method jointly optimizes base station power, multi-user interference, and power allocation factors. The Lagrangian dual method and sub-gradient approach are employed to solve the non-convex optimization problem caused by multiple users and small base stations. Simulation results demonstrate that, under the same resource allocation, the proposed RISNOMA integrated sensing and communication system significantly reduces the average positioning error compared to traditional NOMA-based system.

NOMA  /  smart grid  /  RIS  /  sub-gradient
Xiaorong DUAN, Junwei MA, Min ZHAO, Delu ZHANG, Meiling LI. Positioning Performance Optimization for Reconfigurable Intelligent Surface Assisted NOMA System[J]. Radio Communications Technology, 2025 , 51 (5) : 967 -975 . DOI: 10.3969/j.issn.1003-3114.2025.05.010
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doi: 10.3969/j.issn.1003-3114.2025.05.010
  • Receive Date：2025-06-13
  • Online Date：2026-04-17
  • Published：2025-09-18
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  • Received：2025-06-13
Affiliations
    1.Information and Communications Branch, State Grid Shanxi Electric Power Company, Taiyuan 030021, China
    2.School of Electronic Information Engineering, Taiyuan University of Seience and Technology, Taiyuan 030024, China
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