双RIS辅助的多天线协作NOMA短包通信系统性能分析

宋文彬; 陈德川; 张新刚; 王志鹏; 孙晓林; 王保平

doi:10.11999/JEIT250761

双RIS辅助的多天线协作NOMA短包通信系统性能分析

doi: 10.11999/JEIT250761 cstr: 32379.14.JEIT250761

南阳师范学院物理与电子工程学院南阳 473061

基金项目: 河南省自然科学基金252300421813，河南省社科规划项目2024ZZX024，河南省高等学校科学技术研究重点项目23A520027和24A520032，南阳师范学院青年骨干教师培养计划2023-QNGG-7

详细信息

作者简介:
宋文彬：男，硕士生，主要研究方向为RIS等

陈德川：男，讲师，主要研究方向为短包通信、物理层安全等

张新刚：男，教授，主要研究方向为信息安全等

王志鹏：男，副教授，主要研究方向为NOMA等

孙晓林：女，网络工程师，主要研究方向为无线通信等

王保平：男，副教授，主要研究方向为智能无线通信等

通讯作者:
陈德川　chenchuan927@163.com

中图分类号: TN929.5
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- 被引次数: 0
出版历程
- 收稿日期: 2025-08-19
- 修回日期: 2025-11-05
- 录用日期: 2025-11-05
- 网络出版日期: 2025-11-13

Performance Analysis of Double RIS-Assisted Multi-Antenna Cooperative NOMA with Short-Packet Communication

School of Physics and Electronic Engineering, Nanyang Normal University, Nanyang 473061, China

Funds: Natural Science Foundation of Henan 252300421813, Philosophy and Social Sciences Research Planning Program of Henan Province 2024ZZX024, Key Scientific Research Projects of Colleges and Universities in Henan Province of China 23A520027 and 24A520032, Young Backbone Teachers of Nanyang Normal University 2023-QNGG-7

摘要

摘要: 针对物联网(IoT)通信中海量设备接入、频谱资源受限与高可靠传输需求，本文在硬件损伤下，研究了双智能反射面(RIS)辅助的多天线协作非正交多址接入(NOMA)短包通信系统的可靠性能。特别的，一个RIS用于辅助多天线基站(BS)与近用户之间的通信，另一个RIS用于辅助近用户与远用户之间的通信。在最优天线选择方案下，推导出近用户和远用户平均误块率(BLER)的闭式表达式。在此基础上，进一步给出了系统有效吞吐量的闭式表达式，并在可靠性和传输时延约束下确定了使有效吞吐量最大化的最优块长。仿真结果验证了理论分析的正确性，并表明双RIS辅助传输方案相比单RIS辅助传输方案和无RIS辅助传输方案可以获得更优的性能。此外，受限于中继链路，远用户的平均BLER并不会随着BS天线数目的增加而一直减小。
- 智能反射面 /
- 非正交多址接入 /
- 短包通信 /
- 平均误块率
Abstract: Objective Numerous existing studies on short-packet communication systems rely on the assumption of ideal transceiver devices. However, this assumption is unrealistic because radio-frequency transceiver hardware inevitably suffers from impairments such as phase noise and amplifier nonlinearity. Such impairments are particularly pronounced in short-packet communication systems, where low-cost hardware components are widely employed. However, the performance of reconfigurable intelligent surface (RIS)-assisted multi-antenna cooperative non-orthogonal multiple access (NOMA) short-packet communication systems with hardware impairments has not been investigated. Furthermore, the impact of the number of base station (BS) antennas and RIS reflecting elements on the reliable performance remains unexplored. Therefore, this paper investigates the reliable performance of double RIS-assisted multi-antenna cooperative NOMA short-packet communication systems, where one RIS facilitates communication between a multi-antenna BS and a near user, and the other RIS enhances communication between the near user and a far user. Methods Based on finite blocklength information theory, closed-form expressions for the average block error rate (BLER) of the near and far users are derived under the optimal antenna selection strategy. These expressions provide an efficient and convenient approach for evaluating the reliability of the considered system. Next, the effective throughput is formulated, and the optimal blocklength that maximizes it under reliability and latency constraints is derived. Results and Discussions The theoretical average BLER results show excellent agreement with Monte Carlo simulation results, confirming the validity of the derivations. The average BLER for the near and far users decreases as the transmit signal-to-noise ratio (SNR) increases. Moreover, for a given transmit SNR, increasing the blocklength significantly reduces the average BLER for the near and far users (Fig. 2). The reason for this improvement is that longer blocklengths decrease the transmission rate, thereby enhancing system reliability. The average BLER for the near user initially decreases before reaching a minimum and then increases as the power allocation coefficient increases (Fig. 3). This trend is due to the fact that increasing the power allocation coefficient reduces the BLER for decoding the near user's signal but increases the complexity of the successive interference cancellation (SIC) process. In contrast, the average BLER for the far user increases as the power allocation coefficient increases. The double RIS-assisted transmission scheme demonstrates superior performance compared to the single RIS-assisted and non-RIS-assisted transmission schemes (Fig. 4). Specifically, as the number of RIS reflecting elements increases, the performance advantage of the proposed scheme over these benchmark schemes becomes increasingly significant. The average BLER for the far user saturates as the number of BS antennas increases (Fig. 5). This is due to the fact that the relaying link becomes the dominant performance bottleneck when the number of BS antennas exceeds a certain value. As the blocklength increases, the effective throughput first reaches a maximum and then gradually decreases (Fig. 6). This is because when the blocklength is too small, a higher BLER results in poor effective throughput. When the blocklength is too large, a lower transmission rate also leads to poor effective throughput. As the quality of hardware improves, the optimal blocklength decreases. This can be justified by the fact that lower hardware impairments reduce decoding errors, meaning that shorter blocklengths can be used to reduce transmission latency while still satisfying reliability constraints. Conclusions This paper investigates the performance of the double RIS-assisted multi-antenna cooperative NOMA short-packet communication system under hardware impairments. Closed-form expressions for the average BLER of the near and far users are derived under the optimal antenna selection strategy. Furthermore, the effective throughput is analyzed, and the optimal blocklength that maximizes the effective throughput under reliability and latency constraints is determined. Simulation results demonstrate that the double RIS-assisted transmission scheme achieves superior performance compared to the single RIS-assisted and non-RIS-assisted transmission schemes. In addition, increasing the number of BS antennas does not always improve the average BLER for the far user due to the relaying link constraint. Power allocation is critical for ensuring user reliability. The near user should carefully balance self-signal demodulation and SIC under a total power constraint. Superior hardware quality enhances short-packet communication efficiency by lowering the optimal blocklength. Future work will focus on developing RIS configuration schemes that simultaneously maximize energy efficiency (EE) and ensure user fairness in NOMA to address the needs of energy-constrained IoT devices.
- Reconfigurable intelligent surfaces (RIS) /
- Non-orthogonal multiple access (NOMA) /
- Short-packet communication /
- Average block error rate (BLER)

HTML全文

图 1 双RIS辅助的多天线协作NOMA系统模型图

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图 2 不同块长下平均BLER随发送信噪比$\lambda $变化的示意图

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图 3 平均BLER随RIS反射单元数目$N$变化的示意图

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图 4 平均BLER随BS天线数目$M$变化的示意图

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图 5 不同硬件损伤下有效吞吐量随块长$L$变化的示意图

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