Which Channel in 6G, Low-rank or Full-rank, more needs RIS from a Perspective of DoF?
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866918242668249088 |
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| author | Li, Yongqiang Shu, Feng Li, Maolin Yang, Ke Deng, Bin Wang, Xuehui Zhou, Fuhui Pan, Cunhua Wu, Qingqing |
| author_facet | Li, Yongqiang Shu, Feng Li, Maolin Yang, Ke Deng, Bin Wang, Xuehui Zhou, Fuhui Pan, Cunhua Wu, Qingqing |
| contents | Reconfigurable intelligent surface (RIS), as an efficient tool to improve receive signal-to-noise ratio, extend coverage and create more spatial diversity, is viewed as a most promising technique for the future wireless networks like 6G. As you know, RIS is very suitable for a special wireless scenario with wireless link between BS and users being completely blocked, i.e., no link. In this paper, we extend its applications to a general scenario, i.e., rank-deficient channel, particularly some extremely low-rank ones such as no link, and line-of-sight (LoS, rank-one). Actually, there are several potential important low-rank applications like low-altitude, satellite, UAV, marine, and deep-space communications. In such a situation, it is found that RIS may make a dramatic degrees of freedom (DoF) enhancement over no RIS. By using a distributed RISs placement, the DoF of channel from BS to user in LoS channel may be even boosted from a low-rank like 0/1 to full-rank. This will achieve an extremely rate improvement via spatial parallel multiple-stream transmission from BS to user. In this paper, we present a complete review of making an in-depth discussion on DoF effect of RIS. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_13769 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Which Channel in 6G, Low-rank or Full-rank, more needs RIS from a Perspective of DoF? Li, Yongqiang Shu, Feng Li, Maolin Yang, Ke Deng, Bin Wang, Xuehui Zhou, Fuhui Pan, Cunhua Wu, Qingqing Signal Processing Reconfigurable intelligent surface (RIS), as an efficient tool to improve receive signal-to-noise ratio, extend coverage and create more spatial diversity, is viewed as a most promising technique for the future wireless networks like 6G. As you know, RIS is very suitable for a special wireless scenario with wireless link between BS and users being completely blocked, i.e., no link. In this paper, we extend its applications to a general scenario, i.e., rank-deficient channel, particularly some extremely low-rank ones such as no link, and line-of-sight (LoS, rank-one). Actually, there are several potential important low-rank applications like low-altitude, satellite, UAV, marine, and deep-space communications. In such a situation, it is found that RIS may make a dramatic degrees of freedom (DoF) enhancement over no RIS. By using a distributed RISs placement, the DoF of channel from BS to user in LoS channel may be even boosted from a low-rank like 0/1 to full-rank. This will achieve an extremely rate improvement via spatial parallel multiple-stream transmission from BS to user. In this paper, we present a complete review of making an in-depth discussion on DoF effect of RIS. |
| title | Which Channel in 6G, Low-rank or Full-rank, more needs RIS from a Perspective of DoF? |
| topic | Signal Processing |
| url | https://arxiv.org/abs/2411.13769 |