零前缀OFDM中智能反射表面环境下干扰抑制算法研究

曾嵘; 邵智敏

doi:10.11999/JEIT211389

零前缀OFDM中智能反射表面环境下干扰抑制算法研究

doi: 10.11999/JEIT211389

曾嵘,
邵智敏^,

杭州电子科技大学通信工程学院杭州 310018

基金项目: 东南大学移动通信国家重点实验室开放研究基金(2020D-13)，之江实验室开放课题(2019LC0AB02)

详细信息

作者简介:
曾嵘：男，1976年生，副教授，研究方向为无线移动通信

邵智敏：男，1997年生，硕士生，研究方向为无线通信系统

通讯作者:
邵智敏　shaozm1018@163.com

中图分类号: TN911.7
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- 被引次数: 0
出版历程
- 收稿日期: 2021-12-01
- 修回日期: 2022-05-11
- 录用日期: 2022-05-24
- 网络出版日期: 2022-05-27
- 刊出日期: 2022-07-25

Research on Interference Suppression Algorithm in Reconfigurable Intelligent Surface Environment in ZP-OFDM

ZENG Rong,
SHAO Zhimin^,

School of Communication Engineering, Hangzhou Dianzi University, Hangzhou 310018, China

Funds: The Open Research Foundation of the State Key Laboratory of Mobile Communication, Southeast University (2020D-13), The Open Project of Zhijiang Laboratory (2019LC0AB02)

摘要

摘要: 在智能反射表面(RIS)场景下的零前缀正交频分复用(ZP-OFDM)系统中由于反射元件系数转换引起的等效信道时变，其破坏了正交频分复用(OFDM)系统的正交性并产生严重的子载波间干扰(ICI)。该文通过构建该场景下的系统传输模型，通过分析ICI功率和对反射元件系数转换时变特性进行建模，利用构建子载波间干扰抑制矩阵对ICI进行补偿，抑制由于反射系数变化造成的等效时变信道对系统性能的影响。仿真结果表明，子载波间干扰得到了有效抑制，该文提出的干扰抑制算法对于系统的传输性能有较明显的提升。
- 子载波间干扰 /
- 智能反射表面 /
- 正交频分复用 /
- 时变信道
Abstract: Equivalent channel time variation caused by coefficient conversion of reflective elements in Zero Prefix Orthogonal Frequency Division Multiplexing (ZP-OFDM) system in Reconfigurable Intelligent Surface (RIS) scene, it destroys the orthogonality of Orthogonal Frequency Division Multiplexing (OFDM) system and produces serious Inter Carrier Interference (ICI). In this paper, by constructing the system transmission model in this scenario, analyzing the ICI power and modeling the time-varying characteristics of the coefficient conversion of the reflection element, the ICI is compensated by constructing the inter subcarrier interference suppression matrix to suppress the impact of the equivalent time-varying channel caused by the change of reflection coefficient on the system performance. The simulation results show that the inter subcarrier interference is effectively suppressed, and the interference suppression algorithm proposed in this paper can significantly improve the transmission performance of the system.
- Inter Carrier Interference (ICI) /
- Reconfigurable Intelligent Surface (RIS) /
- Orthogonal Frequency Division Multiplexing (OFDM) /
- Time varying channel

HTML全文

图 1 RIS中信号传输框图

下载: 全尺寸图片幻灯片

图 2 ZP-OFDM信号接收图

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图 3 切换时间长度d和ICI功率的关系图

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图 4 误码率和切换长度d的关系图

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图 5 ICI功率和切换长度d的关系图

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图 6 提出算法补偿后误码率性能比较图

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