Reconfigurable Intelligent Surface-Aided Near-field Communications for 6G: Opportunities and Challenges
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866929263824863232 |
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| author | Mu, Xidong Xu, Jiaqi Liu, Yuanwei Hanzo, Lajos |
| author_facet | Mu, Xidong Xu, Jiaqi Liu, Yuanwei Hanzo, Lajos |
| contents | Reconfigurable intelligent surface (RIS)-aided near-field communications is investigated. First, the necessity of investigating RIS-aided near-field communications and the advantages brought about by the unique spherical-wave-based near-field propagation are discussed. Then, the family of patch-array-based RISs and metasurface-based RISs are introduced along with their respective near-field channel models. A pair of fundamental performance limits of RIS-aided near-field communications, namely their power scaling law and effective degrees-of-freedom, are analyzed for both patch-array-based and metasurface-based RISs, which reveals the potential performance gains that can be achieved. Furthermore, the associated near-field beam training and beamforming design issues are studied, where a two-stage hierarchical beam training approach and a low-complexity element-wise beamforming design are proposed for RIS-aided near-field communications. Finally, a suite of open research problems is highlighted for motivating future research. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_13004 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Reconfigurable Intelligent Surface-Aided Near-field Communications for 6G: Opportunities and Challenges Mu, Xidong Xu, Jiaqi Liu, Yuanwei Hanzo, Lajos Information Theory Signal Processing Reconfigurable intelligent surface (RIS)-aided near-field communications is investigated. First, the necessity of investigating RIS-aided near-field communications and the advantages brought about by the unique spherical-wave-based near-field propagation are discussed. Then, the family of patch-array-based RISs and metasurface-based RISs are introduced along with their respective near-field channel models. A pair of fundamental performance limits of RIS-aided near-field communications, namely their power scaling law and effective degrees-of-freedom, are analyzed for both patch-array-based and metasurface-based RISs, which reveals the potential performance gains that can be achieved. Furthermore, the associated near-field beam training and beamforming design issues are studied, where a two-stage hierarchical beam training approach and a low-complexity element-wise beamforming design are proposed for RIS-aided near-field communications. Finally, a suite of open research problems is highlighted for motivating future research. |
| title | Reconfigurable Intelligent Surface-Aided Near-field Communications for 6G: Opportunities and Challenges |
| topic | Information Theory Signal Processing |
| url | https://arxiv.org/abs/2312.13004 |