Multi-user joint RIS channel estimation based on ADMM
Addressing the challenges of high pilot overhead and computational complexity in traditional channel estimation methods for millimeter-wave communication systems aided by reconfigurable intelligent surfaces (RIS), a novel channel estimation algorithm based on the alternating direction method of mult...
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| Format: | Article |
| Language: | zho |
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Beijing Xintong Media Co., Ltd
2024-12-01
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| Series: | Dianxin kexue |
| Subjects: | |
| Online Access: | http://www.telecomsci.com/zh/article/doi/10.11959/j.issn.1000-0801.2024252/ |
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| _version_ | 1841528766489165824 |
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| author | ZHU Luhu WANG Anding |
| author_facet | ZHU Luhu WANG Anding |
| author_sort | ZHU Luhu |
| collection | DOAJ |
| description | Addressing the challenges of high pilot overhead and computational complexity in traditional channel estimation methods for millimeter-wave communication systems aided by reconfigurable intelligent surfaces (RIS), a novel channel estimation algorithm based on the alternating direction method of multipliers (ADMM) for multi-user joint scenarios was proposed. Firstly, leveraging the shared base station (BS)-RIS component within the cascaded channels of different users, the common subspace of user signals was estimated and projected to effectively mitigate noise interference. Secondly, considering the correlation and sparsity of multi-user cascaded channels, an optimization problem for the sparse cascaded channel matrix and common scaling factor matrix was formulated. To solve this non-convex joint optimization problem, the ADMM algorithm was employed to alternately optimize the sparse matrix and the common scaling factor matrix. Simulation results demonstrate that, compared to existing methods, the proposed ADMM-based channel estimation algorithm for multi-user joint scenarios reduces pilot overhead by approximately 50%. |
| format | Article |
| id | doaj-art-84a03a4fd50545f0a0835247ff2c5add |
| institution | Kabale University |
| issn | 1000-0801 |
| language | zho |
| publishDate | 2024-12-01 |
| publisher | Beijing Xintong Media Co., Ltd |
| record_format | Article |
| series | Dianxin kexue |
| spelling | doaj-art-84a03a4fd50545f0a0835247ff2c5add2025-01-15T03:34:23ZzhoBeijing Xintong Media Co., LtdDianxin kexue1000-08012024-12-0140748579426232Multi-user joint RIS channel estimation based on ADMMZHU LuhuWANG AndingAddressing the challenges of high pilot overhead and computational complexity in traditional channel estimation methods for millimeter-wave communication systems aided by reconfigurable intelligent surfaces (RIS), a novel channel estimation algorithm based on the alternating direction method of multipliers (ADMM) for multi-user joint scenarios was proposed. Firstly, leveraging the shared base station (BS)-RIS component within the cascaded channels of different users, the common subspace of user signals was estimated and projected to effectively mitigate noise interference. Secondly, considering the correlation and sparsity of multi-user cascaded channels, an optimization problem for the sparse cascaded channel matrix and common scaling factor matrix was formulated. To solve this non-convex joint optimization problem, the ADMM algorithm was employed to alternately optimize the sparse matrix and the common scaling factor matrix. Simulation results demonstrate that, compared to existing methods, the proposed ADMM-based channel estimation algorithm for multi-user joint scenarios reduces pilot overhead by approximately 50%.http://www.telecomsci.com/zh/article/doi/10.11959/j.issn.1000-0801.2024252/massive MIMOreconfigurable intelligent surfacechannel estimationalternating direction method of multipliers |
| spellingShingle | ZHU Luhu WANG Anding Multi-user joint RIS channel estimation based on ADMM Dianxin kexue massive MIMO reconfigurable intelligent surface channel estimation alternating direction method of multipliers |
| title | Multi-user joint RIS channel estimation based on ADMM |
| title_full | Multi-user joint RIS channel estimation based on ADMM |
| title_fullStr | Multi-user joint RIS channel estimation based on ADMM |
| title_full_unstemmed | Multi-user joint RIS channel estimation based on ADMM |
| title_short | Multi-user joint RIS channel estimation based on ADMM |
| title_sort | multi user joint ris channel estimation based on admm |
| topic | massive MIMO reconfigurable intelligent surface channel estimation alternating direction method of multipliers |
| url | http://www.telecomsci.com/zh/article/doi/10.11959/j.issn.1000-0801.2024252/ |
| work_keys_str_mv | AT zhuluhu multiuserjointrischannelestimationbasedonadmm AT wanganding multiuserjointrischannelestimationbasedonadmm |