RIS-Assisted High-Speed Communications with Time-Varying Distance-Dependent Rician Channels
Reconfigurable intelligent surface (RIS) has been envisioned as one of the promising solutions for enhancing signal transmissions in high-speed communications (HSC). In this paper, we present a time-varying channel model with distance-dependent Rician factors for the RIS-assisted HSC. Our model not...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-11-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/22/11857 |
| _version_ | 1797465897322938368 |
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| author | Ke Wang Chan-Tong Lam Benjamin K. Ng |
| author_facet | Ke Wang Chan-Tong Lam Benjamin K. Ng |
| author_sort | Ke Wang |
| collection | DOAJ |
| description | Reconfigurable intelligent surface (RIS) has been envisioned as one of the promising solutions for enhancing signal transmissions in high-speed communications (HSC). In this paper, we present a time-varying channel model with distance-dependent Rician factors for the RIS-assisted HSC. Our model not only contains Rayleigh components and Doppler shift (DS) terms but also distance-dependent Rician factors, for characterizing time-varying features. In particular, we show that when the vehicle is far from the base station and the RIS, the channel contains only Rayleigh fading. However, when they are close enough, the channel can be considered as a light-of-sight channel. Based on the proposed model, it is proven that using RIS phase shift optimization, the DS of the cascaded links can be aligned with the DS of the direct link; and if the direct link is blocked, the DS can be removed entirely. Furthermore, we derive the closed-form expressions for the ergodic spectral efficiency and the outage probability of the proposed system. Besides, it is observed that the deployment strategy also affects the system performance. Simulation results validate all analyses. |
| first_indexed | 2024-03-09T18:29:00Z |
| format | Article |
| id | doaj.art-16a10437f5ff41e58d5748d73d1db0e2 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T18:29:00Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-16a10437f5ff41e58d5748d73d1db0e22023-11-24T07:42:02ZengMDPI AGApplied Sciences2076-34172022-11-0112221185710.3390/app122211857RIS-Assisted High-Speed Communications with Time-Varying Distance-Dependent Rician ChannelsKe Wang0Chan-Tong Lam1Benjamin K. Ng2Faculty of Applied Sciences, Macao Polytechnic University, Macao 999078, ChinaFaculty of Applied Sciences, Macao Polytechnic University, Macao 999078, ChinaFaculty of Applied Sciences, Macao Polytechnic University, Macao 999078, ChinaReconfigurable intelligent surface (RIS) has been envisioned as one of the promising solutions for enhancing signal transmissions in high-speed communications (HSC). In this paper, we present a time-varying channel model with distance-dependent Rician factors for the RIS-assisted HSC. Our model not only contains Rayleigh components and Doppler shift (DS) terms but also distance-dependent Rician factors, for characterizing time-varying features. In particular, we show that when the vehicle is far from the base station and the RIS, the channel contains only Rayleigh fading. However, when they are close enough, the channel can be considered as a light-of-sight channel. Based on the proposed model, it is proven that using RIS phase shift optimization, the DS of the cascaded links can be aligned with the DS of the direct link; and if the direct link is blocked, the DS can be removed entirely. Furthermore, we derive the closed-form expressions for the ergodic spectral efficiency and the outage probability of the proposed system. Besides, it is observed that the deployment strategy also affects the system performance. Simulation results validate all analyses.https://www.mdpi.com/2076-3417/12/22/11857reconfigurable intelligent surfacesDoppler effectshigh-speed communicationsdistance-dependent Rician factors |
| spellingShingle | Ke Wang Chan-Tong Lam Benjamin K. Ng RIS-Assisted High-Speed Communications with Time-Varying Distance-Dependent Rician Channels Applied Sciences reconfigurable intelligent surfaces Doppler effects high-speed communications distance-dependent Rician factors |
| title | RIS-Assisted High-Speed Communications with Time-Varying Distance-Dependent Rician Channels |
| title_full | RIS-Assisted High-Speed Communications with Time-Varying Distance-Dependent Rician Channels |
| title_fullStr | RIS-Assisted High-Speed Communications with Time-Varying Distance-Dependent Rician Channels |
| title_full_unstemmed | RIS-Assisted High-Speed Communications with Time-Varying Distance-Dependent Rician Channels |
| title_short | RIS-Assisted High-Speed Communications with Time-Varying Distance-Dependent Rician Channels |
| title_sort | ris assisted high speed communications with time varying distance dependent rician channels |
| topic | reconfigurable intelligent surfaces Doppler effects high-speed communications distance-dependent Rician factors |
| url | https://www.mdpi.com/2076-3417/12/22/11857 |
| work_keys_str_mv | AT kewang risassistedhighspeedcommunicationswithtimevaryingdistancedependentricianchannels AT chantonglam risassistedhighspeedcommunicationswithtimevaryingdistancedependentricianchannels AT benjaminkng risassistedhighspeedcommunicationswithtimevaryingdistancedependentricianchannels |