Journal of Information and Intelligence最新文献_第5页

Information metasurfaces and reconfigurable intelligent surfaces 信息元曲面和可重构智能曲面

Journal of Information and Intelligence Pub Date : 2023-09-01 DOI: 10.1016/j.jiixd.2023.07.001

Long Li, Rui Zhang, Tie Jun Cui

引用次数: 0

Wireless communications empowered by reconfigurable intelligent surfaces: Model-based vs model-free channel estimation 由可重构智能表面支持的无线通信:基于模型与无模型的信道估计

Journal of Information and Intelligence Pub Date : 2023-09-01 DOI: 10.1016/j.jiixd.2023.06.010

Li Wei , Chongwen Huang , George C. Alexandropoulos , Ahmet M. Elbir , Zhaohui Yang , Zhaoyang Zhang , Marco Di Renzo , Mérouane Debbah , Chau Yuen

{"title":"Wireless communications empowered by reconfigurable intelligent surfaces: Model-based vs model-free channel estimation","authors":"Li Wei , Chongwen Huang , George C. Alexandropoulos , Ahmet M. Elbir , Zhaohui Yang , Zhaoyang Zhang , Marco Di Renzo , Mérouane Debbah , Chau Yuen","doi":"10.1016/j.jiixd.2023.06.010","DOIUrl":"https://doi.org/10.1016/j.jiixd.2023.06.010","url":null,"abstract":"<div><p>Reconfigurable intelligent surfaces (RISs) are lately being attractive for their great potential in future sixth generation wireless communications (6G), which is attributed to their affordable energy consumption and easy integration. However, the large numbers of low-cost reflecting elements comprising RISs impose challenges for channel acquisition in various RIS-based wireless applications, such as RIS-enhanced orthogonal frequency-division multiplexing and multi-user multiple-input multiple-output systems. In this article, we first overview the state-of-the-art RIS hardware architectures designed to assist channel estimation for RIS-empowered wireless communication systems. We also overview existing channel estimation approaches, which are categorized into model-based and model-free techniques, and discuss their advantages and limitations depending on the RIS deployment. Design challenges with RIS-empowered systems in terms of hardware and other parameter limitations are presented, together with future research directions for channel estimation in RIS-based wireless systems, such as RISs with extremely large numbers of elements, multi-hop communications with RISs, and frequency division duplexing for high mobility systems.</p></div>","PeriodicalId":100790,"journal":{"name":"Journal of Information and Intelligence","volume":"1 3","pages":"Pages 253-266"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49727935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

DRL-based max-min fair RIS discrete phase shift optimization for MISO-OFDM systems 基于drl的MISO-OFDM系统最大最小公平RIS离散相移优化

Journal of Information and Intelligence Pub Date : 2023-09-01 DOI: 10.1016/j.jiixd.2023.06.003

Peng Chen, Huaqian Zhang, Xiao Li, Shi Jin

引用次数: 0

Reconfigurable intelligent surface with high optical-transparency based on metalmesh 基于金属网的可重构高光学透明度智能表面

Journal of Information and Intelligence Pub Date : 2023-09-01 DOI: 10.1016/j.jiixd.2023.06.008

Jing Cheng Liang , Peng Zhang , Qiang Cheng , Tie Jun Cui

{"title":"Reconfigurable intelligent surface with high optical-transparency based on metalmesh","authors":"Jing Cheng Liang , Peng Zhang , Qiang Cheng , Tie Jun Cui","doi":"10.1016/j.jiixd.2023.06.008","DOIUrl":"https://doi.org/10.1016/j.jiixd.2023.06.008","url":null,"abstract":"<div><p>Reconfigurable intelligent surfaces (RISs) have aroused extensive attentions from academic and wireless communication communities due to their abilities to customize the electromagnetic (EM) characteristics of the propagation channels flexibly and rapidly. Recent advances in theoretical innovations and prototype systems have demonstrated the advantages of RISs in terms of low cost, low power consumption, and easy deployment. Meanwhile, the optically transparent RISs are demanded in some application scenarios. In this paper, we propose a 2-bit metalmesh-based RIS with high optical-transparency. By analyzing the surface current distributions on the element, we employ the metalmesh-grid patterns and metalmesh-stripe patterns on the top and ground layers respectively. The metalmesh patterns can help improve the optical transparency of RISs, while maintaining similar microwave characteristics. The RIS can reach the optical transparency of 79%, and the reflection amplitude is greater than −3.2 dB within the operating band. Finally, to verify the capability of the proposed RIS in wavefront controls, the far-field scattering patterns of the RIS with different coding sequences are investigated and the simulation results are in good agreement with the theoretical results.</p></div>","PeriodicalId":100790,"journal":{"name":"Journal of Information and Intelligence","volume":"1 3","pages":"Pages 228-237"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49755548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Active metasurface in reflection manner for generation of reconfigurable OAM vortex beams 以反射方式产生可重构OAM涡旋光束的主动超表面

Journal of Information and Intelligence Pub Date : 2023-09-01 DOI: 10.1016/j.jiixd.2023.06.006

Yunfei Liu, Yueyi Yuan, Qun Wu, Kuang Zhang

引用次数: 0

Generation and regulation of two-dimensional autofocusing Airy beams based on holographic metasurfaces 基于全息超表面的二维自聚焦Airy光束的产生与调节

Journal of Information and Intelligence Pub Date : 2023-09-01 DOI: 10.1016/j.jiixd.2023.05.002

Song Zhang , Hao Xue , Yicen Li , Jiaqi Han , Haixia Liu , Long Li , Tie Jun Cui

{"title":"Generation and regulation of two-dimensional autofocusing Airy beams based on holographic metasurfaces","authors":"Song Zhang , Hao Xue , Yicen Li , Jiaqi Han , Haixia Liu , Long Li , Tie Jun Cui","doi":"10.1016/j.jiixd.2023.05.002","DOIUrl":"https://doi.org/10.1016/j.jiixd.2023.05.002","url":null,"abstract":"<div><p>This paper proposes a new method to generate a two-dimensional (2D) Airy beam and Airy autofocusing beam by using the scalar holographic metasurface with amplitude-phase modulation in the microwave band. The proposed holographic metasurface comprises subwavelength patch unit cells with a period of fewer than 1/8 wavelengths, which means that it has the finer sampling for electromagnetic waves and can simultaneously achieve precise modulations for the amplitude and phase of electromagnetic waves. Firstly, the 2D-Airy beam with quasi-non-diffraction and self-bending characteristics is generated, from which the holographic metasurface is designed to realize four different 2D-Airy beams with the same focus, achieving the 2D-Airy autofocusing beam in the microwave frequency. The holographic metasurface for Airy beam generation has high efficiency and an ultra-lower profile. Meanwhile, for applying the Airy beam in wireless power transfer (WPT), the efficiency of the generated Airy beam and Airy autofocusing beam is calculated for the first time in the microwave field. The simulation results show that the efficiency of the 2D-Airy beam can reach 66% at 150 mm away from the metasurface, while the efficiency of the 2D-Airy autofocusing beam at the focus, which is 280 mm from the metasurface, can reach 35%. The theoretical, simulated, and measured results show that the proposed method and holographic metasurfaces can flexibly achieve the special characteristics of self-autofocusing and self-bending Airy beams in the microwave domain, providing an effective path for wireless power transfer (WPT) scenario with radial obstructions.</p></div>","PeriodicalId":100790,"journal":{"name":"Journal of Information and Intelligence","volume":"1 3","pages":"Pages 182-196"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49766530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An electromechanically reconfigurable intelligent surface for enhancing sub-6G wireless communication signal 一种用于增强sub-6G无线通信信号的机电可重构智能表面

Journal of Information and Intelligence Pub Date : 2023-09-01 DOI: 10.1016/j.jiixd.2023.06.009

Kai Qu, Ke Chen, Jianmin Zhao, Na Zhang, Qi Hu, Junming Zhao, Tian Jiang, Yijun Feng

{"title":"An electromechanically reconfigurable intelligent surface for enhancing sub-6G wireless communication signal","authors":"Kai Qu, Ke Chen, Jianmin Zhao, Na Zhang, Qi Hu, Junming Zhao, Tian Jiang, Yijun Feng","doi":"10.1016/j.jiixd.2023.06.009","DOIUrl":"https://doi.org/10.1016/j.jiixd.2023.06.009","url":null,"abstract":"<div><p>Reconfigurable intelligent surface (RIS) is emerged as a promising technique to solve the challenges faced by future wireless communication networks. Although the most commonly used electrically-controlled RISs can achieve millisecond-scale speed of dynamic switch, they have a large number of microwave circuit elements (such as PIN diodes or varactors) which will bring non-negligible insertion loss, and the complicity of the bias network to electrically addressing each element will increase with the expansion of the RIS aperture. Aiming at further reducing the fabrication cost and power consumption, herein an electromechanical RIS used for sub-6G wireless communication is proposed. The electromechanical RIS is designed with a passive metasurface and step-motor driver modules, providing simultaneous high-efficiency reflection (over 80%) and continuous reflection phase coverage of 360°. Through electromechanical control, the RIS system can realize different reflective wavefront shaping, and has been employed in the indoor sub-6G wireless environment demonstrating a maximum signal improvement of 8.3 dB. The proposed electromechanical RIS is particularly useful for wireless signal enhancement in static blind area, and has the obvious advantage of not requiring continuous power supply after the RIS being regulated. Therefore, it greatly reduces the overall cost and power consumption which may have potentials in indoor application scenarios for improving wireless communication performance.</p></div>","PeriodicalId":100790,"journal":{"name":"Journal of Information and Intelligence","volume":"1 3","pages":"Pages 207-216"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49755531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Rate optimization using low complex methods with reconfigurable intelligent surfaces 基于可重构智能曲面的低复杂度速率优化方法

Journal of Information and Intelligence Pub Date : 2023-09-01 DOI: 10.1016/j.jiixd.2023.06.004

Saber Hassouna, Muhammad Ali Jamshed, Masood Ur Rehman, Muhammad Ali Imran, Qammer H. Abbasi

{"title":"Rate optimization using low complex methods with reconfigurable intelligent surfaces","authors":"Saber Hassouna, Muhammad Ali Jamshed, Masood Ur Rehman, Muhammad Ali Imran, Qammer H. Abbasi","doi":"10.1016/j.jiixd.2023.06.004","DOIUrl":"https://doi.org/10.1016/j.jiixd.2023.06.004","url":null,"abstract":"<div><p>With the help of a developing technology called reconfigurable intelligent surfaces (RISs), it is possible to modify the propagation environment and boost the data rates of wireless communication networks. In this article, we optimized the phases of the RIS elements and performed a fair power allocation for each subcarrier over the full bandwidth in a single-input-single-output (SISO) wideband system where the user and the access point (AP) are provided with a single antenna. The data rate or its equivalent channel power is maximized by proposing different low-complex algorithms. The strongest tap maximization (STM) and power methods are compared with the semidefinite relaxation (SDR) method in terms of computational complexity and data rate performance. Runtime and complexity analysis of the suggested methods are computed and compared to reveal the actual time consumption and the required number of operations for each method. Simulation results show that with an optimized RIS, the sum rate is 2.5 times higher than with an unconfigured surface, demonstrating the RIS's tremendous advantages even in complex configurations. The data rate performance of the SDR method is higher than the power method and less than the STM method but with higher computational complexity, more than 6 million complex operations, and 50 min of runtime calculations compared with the other STM and power optimization methods.</p></div>","PeriodicalId":100790,"journal":{"name":"Journal of Information and Intelligence","volume":"1 3","pages":"Pages 267-280"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49755101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In-situ manipulation of wireless link with reinforcement-learning-driven programmable metasurface in indoor environment 室内环境下基于强化学习驱动的可编程元表面无线链路的原位操作

Journal of Information and Intelligence Pub Date : 2023-09-01 DOI: 10.1016/j.jiixd.2023.06.007

Jiawen Xu , Rong Zhang , Jie Ma , Hanting Zhao , Lianlin Li

{"title":"In-situ manipulation of wireless link with reinforcement-learning-driven programmable metasurface in indoor environment","authors":"Jiawen Xu , Rong Zhang , Jie Ma , Hanting Zhao , Lianlin Li","doi":"10.1016/j.jiixd.2023.06.007","DOIUrl":"https://doi.org/10.1016/j.jiixd.2023.06.007","url":null,"abstract":"<div><p>It is of great importance to control flexibly wireless links in the modern society, especially with the advent of the Internet of Things (IoT), fifth-generation communication (5G), and beyond. Recently, we have witnessed that programmable metasurface (PM) or reconfigurable intelligent surface (RIS) has become a key enabling technology for manipulating flexibly the wireless link; however, one fundamental but challenging issue is to online design the PM's control sequence in a complicated wireless environment, such as the real-world indoor environment. Here, we propose a reinforcement learning (RL) approach to online control of the PM and thus in-situ improve the quality of the underline wireless link. We designed an inexpensive one-bit PM working at around 2.442 GHz and developed associated RL algorithms, and demonstrated experimentally that it is capable of enhancing the quality of commodity wireless link by a factor of about 10 dB and beyond in multiple scenarios, even if the wireless transmitter is in the glancing angle of the PM in the real-world indoor environment. Moreover, we also prove that our RL algorithm can be extended to improve the wireless signals of receivers in dual-receiver scenario. We faithfully expect that the presented technique could hold important potentials in future wireless communication, smart homes, and many other fields.</p></div>","PeriodicalId":100790,"journal":{"name":"Journal of Information and Intelligence","volume":"1 3","pages":"Pages 217-227"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49755532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of realistic reradiation models in digital reconfigurable intelligent surfaces 真实辐射模型对数字可重构智能曲面的影响

Journal of Information and Intelligence Pub Date : 2023-09-01 DOI: 10.1016/j.jiixd.2023.06.005

Marco Di Renzo , Abdelhamed Mohamed , Alessio Zappone , Gabriele Gradoni , Marco Rossi , Massimo Moccia , Giuseppe Castaldi , Vincenzo Galdi

引用次数: 1