可重构智能表面通信系统的离散相位误差分析
Discrete phase error analysis of reconfigurable intelligent surface-assisted communication system
徐碧莲 1周婷 2徐天衡 2王玉震1
作者信息
- 1. 中国科学院上海高等研究院,上海 201210;中国科学院大学,北京 100049
- 2. 中国科学院上海高等研究院,上海 201210;上海前瞻创新研究院,上海 200001
- 折叠
摘要
针对可重构智能表面(RIS)实际部署中理想连续相位难实现,造成的性能下降问题,提出一种包含离散相位误差的RIS辅助通信系统.基于三维统计型信道模型,推导该系统遍历容量的近似值表达式.对比理想连续相位的系统后,推导不同相位量化水平的容量损失.仿真验证了遍历容量近似值与蒙特卡罗仿真值能够匹配,同时表明使用一定精度(本文是3至4比特)的相位离散化方案足以逼近连续相位系统的遍历容量.这为RIS的低硬件成本和复杂度的实际应用提供了理论支撑.
Abstract
To solve the performance degradation due to limited precision configuration of the reflecting phases,a reconfigurable intelligent surface(RIS)assisted system with discrete phases was investigated.Based on the three-dimensional statistical channel model,the approximate closed-form expression of the ergodic capacity was derived.Compared with the ideal continuous phase,the proposed system capacity loss expressions at different quantization degrees were obtained.Monte Carlo simulation results can match the proposed approximated capacity.Simulation is also shown that the ergodic capacity of discrete phase system with cer-tain precision(about 3-4 bits in this paper)can be very close to that of continuous phase system,which can provide theoretical support for reducing hardware cost and complexity in practical.
关键词
可重构智能表面/智能反射面/遍历容量/相位误差/离散相位/三维统计性信道模型/蒙特卡罗仿真Key words
reconfigurable intelligent surface/intelligent reflecting surface/ergodic capacity/phase error/discrete phase/three-dimensional statistical channel model/Monte Carlo simulation引用本文复制引用
基金项目
国家重点研发计划基金项目(2018YFB1802300)
上海市科技重点基金项目(20JC1416500)
上海市优秀学术技术带头人基金项目(21XD1433700)
中国科学院青年创新促进会优秀会员基金项目(Y2021077)
上海市产学研科技合作专项基金项目(PKX2020-D12)
出版年
2024
NETL
NSTL
万方数据