Exploiting the Direct Link in IRS Assisted NOMA Networks with Hardware Impairments  

作　　者：Ziwei Liu Xinwei Yue Shuo Chen Xuliang Liu Yafei Wang Wanwei Tang 

机构地区：[1]Key Laboratory of Modern Measurement&Control Technology,Ministry of Education,School of Information and Communication Engineering,Beijing Information Science and Technology University,Beijing,100101,China [2]The Party Committee Office,Yellow River Conservancy Technical Institute,Kaifeng,475001,China [3]Tangshan University,Tangshan,063000,China

出　　处：《Computer Modeling in Engineering & Sciences》2023年第7期767-785,共19页工程与科学中的计算机建模（英文）

基　　金：supported by the National Natural Science Foundation of China under Grants 62071052,61901043;the R&D Program of Beijing Municipal Education Commission under Grant KM202011232003;supported by Talent Engineering Training Funds of Hebei Province under Grant A202101106;Science and Technology Project of Hebei Education Department under Grant QN2020508.

摘　　要：Hardware impairments(HI)are always present in low-cost wireless devices.This paper investigates the outage behaviors of intelligent reflecting surface(IRS)assisted non-orthogonal multiple access(NOMA)networks by taking into account the impact of HI.Specifically,we derive the approximate and asymptotic expressions of the outage probability for the IRS-NOMA-HI networks.Based on the asymptotic results,the diversity orders under perfect self-interference cancellation and imperfect self-interference cancellation scenarios are obtained to evaluate the performance of the considered network.In addition,the system throughput of IRS-NOMA-HI is discussed in delay-limited mode.The obtained results are provided to verify the accuracy of the theoretical analyses and reveal that:1)The outage performance and system throughput for IRS-NOMA-HI outperforms that of the IRS-assisted orthogonal multiple access-HI(IRS-OMA-HI)networks;2)The number of IRS elements,the pass loss factors,the Rician factors,and the value of HI are pivotal to enhancing the performance of IRS-NOMAHI networks;and 3)It is recommended that effective methods of reducing HI should be used to ensure system performance,in addition to self-interference cancellation techniques.

关 键 词：Hardware impairments imperfect SIC intelligent reflecting surface non-orthogonal multiple access outage probability 

分 类 号：TN929.5[电子电信—通信与信息系统]