零前缀OFDM中智能反射表面环境下干扰抑制算法研究  

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

作　　者：曾嵘[1] 邵智敏 ZENG Rong;SHAO Zhimin(School of Communication Engineering,Hangzhou Dianzi University,Hangzhou 310018,China)

机构地区：[1]杭州电子科技大学通信工程学院,杭州310018

出　　处：《电子与信息学报》2022年第7期2358-2365,共8页Journal of Electronics & Information Technology

基　　金：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)。

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。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.

关 键 词：子载波间干扰 智能反射表面 正交频分复用 时变信道 

分 类 号：TN911.7[电子电信—通信与信息系统]