Analysis of Selective User Forwarding in Cell-Free Massive MIMO With Channel Aging
Cell-free massive multiple-input-multiple-output (CF-mMIMO) systems provide spectral efficiency (SE) gains with a more uniform quality-of-service in the network area compared to cellular massive MIMO schemes but at the expense of higher capacity requirements on the fronthaul links. To reduce the sig...
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| Format: | Article |
| Language: | English |
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IEEE
2023-01-01
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| Series: | IEEE Access |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/10160106/ |
| _version_ | 1827897976616386560 |
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| author | Maria Francis Farhad Mehran K. V. S. Hari |
| author_facet | Maria Francis Farhad Mehran K. V. S. Hari |
| author_sort | Maria Francis |
| collection | DOAJ |
| description | Cell-free massive multiple-input-multiple-output (CF-mMIMO) systems provide spectral efficiency (SE) gains with a more uniform quality-of-service in the network area compared to cellular massive MIMO schemes but at the expense of higher capacity requirements on the fronthaul links. To reduce the signaling overhead on fronthaul links, we propose a selective user forwarding method for uplink data transmissions in CF-mMIMO systems, where each access point (AP) forwards the data of only a selected subset of users to the central processing unit (CPU) for joint processing. The simulation results show that the selective user forwarding scheme achieves nearly the same performance as a CF-mMIMO system with selected number of users, <inline-formula> <tex-math notation="LaTeX">$M$ </tex-math></inline-formula>, being equal to less than one-fourth of the total number of users in the network and resulting in a fronthaul signaling savings of about 75%. We then analytically study the performance of the proposed system in the presence of channel aging by deriving expressions for SE. The numerical evaluation of these expressions is shown to be close to the simulation results. |
| first_indexed | 2024-03-12T22:57:21Z |
| format | Article |
| id | doaj.art-eac366e866ef4bc5a5d7319787708bf9 |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-03-12T22:57:21Z |
| publishDate | 2023-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-eac366e866ef4bc5a5d7319787708bf92023-07-19T23:00:45ZengIEEEIEEE Access2169-35362023-01-0111712107122310.1109/ACCESS.2023.328883310160106Analysis of Selective User Forwarding in Cell-Free Massive MIMO With Channel AgingMaria Francis0https://orcid.org/0000-0001-6183-4955Farhad Mehran1K. V. S. Hari2Department of Electrical Communication Engineering, Indian Institute of Science, Bengaluru, IndiaBT (British Telecom) labs, Adastral Park, U.K.Department of Electrical Communication Engineering, Indian Institute of Science, Bengaluru, IndiaCell-free massive multiple-input-multiple-output (CF-mMIMO) systems provide spectral efficiency (SE) gains with a more uniform quality-of-service in the network area compared to cellular massive MIMO schemes but at the expense of higher capacity requirements on the fronthaul links. To reduce the signaling overhead on fronthaul links, we propose a selective user forwarding method for uplink data transmissions in CF-mMIMO systems, where each access point (AP) forwards the data of only a selected subset of users to the central processing unit (CPU) for joint processing. The simulation results show that the selective user forwarding scheme achieves nearly the same performance as a CF-mMIMO system with selected number of users, <inline-formula> <tex-math notation="LaTeX">$M$ </tex-math></inline-formula>, being equal to less than one-fourth of the total number of users in the network and resulting in a fronthaul signaling savings of about 75%. We then analytically study the performance of the proposed system in the presence of channel aging by deriving expressions for SE. The numerical evaluation of these expressions is shown to be close to the simulation results.https://ieeexplore.ieee.org/document/10160106/Cell-free massive MIMO (CF-mMIMO)central processing unit (CPU)channel state information (CSI)channel agingminimum mean square error (MMSE) |
| spellingShingle | Maria Francis Farhad Mehran K. V. S. Hari Analysis of Selective User Forwarding in Cell-Free Massive MIMO With Channel Aging IEEE Access Cell-free massive MIMO (CF-mMIMO) central processing unit (CPU) channel state information (CSI) channel aging minimum mean square error (MMSE) |
| title | Analysis of Selective User Forwarding in Cell-Free Massive MIMO With Channel Aging |
| title_full | Analysis of Selective User Forwarding in Cell-Free Massive MIMO With Channel Aging |
| title_fullStr | Analysis of Selective User Forwarding in Cell-Free Massive MIMO With Channel Aging |
| title_full_unstemmed | Analysis of Selective User Forwarding in Cell-Free Massive MIMO With Channel Aging |
| title_short | Analysis of Selective User Forwarding in Cell-Free Massive MIMO With Channel Aging |
| title_sort | analysis of selective user forwarding in cell free massive mimo with channel aging |
| topic | Cell-free massive MIMO (CF-mMIMO) central processing unit (CPU) channel state information (CSI) channel aging minimum mean square error (MMSE) |
| url | https://ieeexplore.ieee.org/document/10160106/ |
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