Performance Analysis of RSMA-Based Scalable Cell-Free Radio Access Network over Rician Fading Channels

JIANG Hancheng; YIN Yicheng; YI Boyou; ZHANG Yu; LIU Lilan; CHENG Fang; ZHANG Zhizhong

doi:10.11959/j.issn.1000-0801.DXKX260003

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Performance Analysis of RSMA-Based Scalable Cell-Free Radio Access Network over Rician Fading Channels

更新时间：2026-06-18

- Performance Analysis of RSMA-Based Scalable Cell-Free Radio Access Network over Rician Fading Channels
- Telecommunications Science (2026)
- 作者机构：
  
  南京信息工程大学电子与信息工程学院，南京 210044
- 作者简介：
- 基金信息：
  
  Major Science and Technology Project of Jiangsu Province(BG2024002);The National Natural Science Foundation of China(62401271);Natural Science Foundation of the Higher Education Institutions of Jiangsu Province(24KJB510019)
- DOI：10.11959/j.issn.1000-0801.DXKX260003
  CLC： TN929.5
- Received：02 January 2026，
  
  Revised：2026-04-13，
  
  Accepted：18 June 2026，
- 稿件说明：
移动端阅览
JIANG Hancheng, YIN Yicheng, YI Boyou, et al. Performance Analysis of RSMA-Based Scalable Cell-Free Radio Access Network over Rician Fading Channels[J/OL]. Telecommunications Science, 2026.
DOI：

JIANG Hancheng, YIN Yicheng, YI Boyou, et al. Performance Analysis of RSMA-Based Scalable Cell-Free Radio Access Network over Rician Fading Channels[J/OL]. Telecommunications Science, 2026. DOI： 10.11959/j.issn.1000-0801.DXKX260003.

摘要

可扩展无蜂窝无线接入网（Cell-Free Radio Access Network

CF-RAN）通常具有较高视距（Line-of-Sight

LoS）链路概率并呈现莱斯衰落特征，而导频污染与不完美信道状态信息（Channel State Information

CSI）会进一步加剧多用户干扰、限制系统频谱效率。针对莱斯信道下可扩展CF-RAN的下行传输性能分析与优化，引入速率拆分多址（Rate-Splitting Multiple Access

RSMA），并在考虑导频污染与不完美CSI的前提下，推导了公有流与私有流可达速率下界的闭式表达式。在此基础上，构建系统总速率最大化的联合功率与速率分配问题，并采用连续凸近似（Successive Convex Approximation

SCA）进行迭代求解。仿真结果表明，所提方案在不同发射功率、导频长度和莱斯因子设置下相较于空分多址（Space-Division Multiple Access

SDMA）基线均能获得更高的总速率，在高功率区域可实现约2.5bit/s/Hz的性能增益，且具备良好的收敛性。

Abstract

Scalable Cell-Free Radio Access Network (CF-RAN) typically exhibit high Line-of-Sight (LoS) link probabilities and operate under Rician fading channels. However

pilot contamination and imperfect Channel State Information (CSI) exacerbate multi-user interference

thereby limiting spectral efficiency. To address these issues

Rate-Splitting Multiple Access (RSMA) is adopted to analyze and optimize the downlink transmission performance of scalable CF-RANs over Rician channels. By accounting for the aforementioned pilot contamination and imperfect CSI

closed-form expressions for the achievable rate lower bounds of both common and private streams are derived. On this basis

a joint power and rate allocation problem is formulated to maximize the system sum rate

which is then solved iteratively using Successive Convex Approximation (SCA). Simulation results demonstrate that the proposed scheme consistently outperforms the Space-Division Multiple Access (SDMA) baseline in terms of sum rate across various transmit powers

pilot lengths

and Rician factor settings. In addition to achieving a performance gain of approximately 2.5bit/s/Hz in the high-power regime

the proposed algorithm demonstrates rapid convergence.

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references

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