Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2403.12369 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866916582664437760 |
|---|---|
| author | Lu, Liyang Ma, Ke Wang, Yue Wang, Zhaocheng |
| author_facet | Lu, Liyang Ma, Ke Wang, Yue Wang, Zhaocheng |
| contents | In the context of extremely large-scale antenna arrays deployed in sixth-generation (6G) mobile networks, near-field (NF) communications have gained considerable attention. Unlike the planar waves formulated in the far-field, electromagnetic radiation propagates as spherical waves in the NF. This alteration affects the NF channel characteristics, particularly resulting in weak sparsity in angular-domain NF channels, which poses tricky challenges to the application of compressed sensing (CS). Motivated by these facts, the block-dominant compressed sensing (BD-CS) techniques are proposed to assist NF communications. This article starts with the introduction on why block sparsity exists in the distance-limited NF region. Then, block-dominant side-information (BD-SI) is exploited to facilitate the actual NF communication implementation. While BD-CS shows promise in providing exceptional channel estimation accuracy and high spectral efficiency, several key challenges, opportunities, and practical implementation issues in NF communications need careful consideration. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_12369 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Near-Field Communications with Block-Dominant Compressed Sensing: Fundamentals, Approaches, and Future Directions Lu, Liyang Ma, Ke Wang, Yue Wang, Zhaocheng Signal Processing In the context of extremely large-scale antenna arrays deployed in sixth-generation (6G) mobile networks, near-field (NF) communications have gained considerable attention. Unlike the planar waves formulated in the far-field, electromagnetic radiation propagates as spherical waves in the NF. This alteration affects the NF channel characteristics, particularly resulting in weak sparsity in angular-domain NF channels, which poses tricky challenges to the application of compressed sensing (CS). Motivated by these facts, the block-dominant compressed sensing (BD-CS) techniques are proposed to assist NF communications. This article starts with the introduction on why block sparsity exists in the distance-limited NF region. Then, block-dominant side-information (BD-SI) is exploited to facilitate the actual NF communication implementation. While BD-CS shows promise in providing exceptional channel estimation accuracy and high spectral efficiency, several key challenges, opportunities, and practical implementation issues in NF communications need careful consideration. |
| title | Near-Field Communications with Block-Dominant Compressed Sensing: Fundamentals, Approaches, and Future Directions |
| topic | Signal Processing |
| url | https://arxiv.org/abs/2403.12369 |