Intelligent Reflecting Surface Aided Wireless Systems with Imperfect Hardware

被引:4
作者
Nhan Duc Nguyen [1 ]
Anh-Tu Le [2 ]
Munochiveyi, Munyaradzi [3 ]
Afghah, Fatemeh [4 ]
Pallis, Evangelos [5 ]
机构
[1] Van Lang Univ, Fac Engn, Ho Chi Minh City 700000, Vietnam
[2] Ind Univ Ho Chi Minh City, Fac Elect Technol, Ho Chi Minh City 700000, Vietnam
[3] Univ Zimbabwe, Dept Elect & Elect Engn, MP-167 Harare, Zimbabwe
[4] Clemson Univ, Elect & Comp Engn Dept, Clemson, SC 29634 USA
[5] Hellen Mediterranean Univ, Elect & Comp Engn, Iraklion 71004, Crete, Greece
关键词
reconfigurable intelligent surface (RIS); outage probability; in-phase and quadrature-phase imbalance (IQI); CHANNEL ESTIMATION; PERFORMANCE ANALYSIS; BEAMFORMING OPTIMIZATION; MISO COMMUNICATION; DESIGN; NOMA; INFORMATION; FRAMEWORK; SECURITY; NETWORK;
D O I
10.3390/electronics11060900
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
In this article, we investigate the design of reconfigurable intelligent surface (RIS)-aided transmission as a smart method to reflect signals received from access points to users and, hence, improving users' performance. To implement smart Internet of Things (IoT) networks, massive connectivity and low-cost deployment are essential in designing such systems. In particular, we consider two practical scenarios (dual-hop and single-hop transmissions). These scenarios highlight the potential of RIS in enhancing the system's outage probability performance. Furthermore, to characterize channel conditions in practice, we pay particular attention to two-channel distributions that are non-central chi-square (NCCS) distributions that approximate the channel distribution of the RIS-aided wireless system and the squared K-G distribution. In addition, the RIS-aided system may face imperfect hardware-related issues in practice. Therefore, we need to consider the degraded performance of practical RIS-aided systems by considering the detrimental impact of in-phase and quadrature-phase imbalance (IQI). To characterize the main system performance metric, we provide closed-form formulas of outage probability and ergodic capacity. We then evaluate system performance under the impacts of signal-to-noise ratio (SNR), the number of meta-surfaces, and channel parameters. All closed-form outage expressions are validated via Monte Carlo simulations. Simulation results indicate that the considered RIS scheme at dual-hop and single hop under the impact of IQI and RIS hardware impairment achieves significant improvements in terms of outage probability at high SNR and high meta-surface number N. Additionally, the simulation results demonstrate that the impact of IQI on the proposed system is limited. It is worth noting that, in terms of ergodic capacity, ergodic capacity faces an upper limit. Despite this limitation, the proposed system can still work well once some parameters are controlled well, such as the transmit SNR, levels of IQI, and the number of RIS components.
引用
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页数:18
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