Sequential Hybrid Beamforming for Radio Stripes
Cell-free (CF) massive multiple-input multiple-output (mMIMO) systems will revolutionize wireless communication by moving away from traditional base stations (BSs). By eliminating conventional cell boundaries, CF mMIMO deploys a large number of distributed access points (APs), enabling seamless conn...
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IEEE
2025-01-01
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| Series: | IEEE Access |
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| Online Access: | https://ieeexplore.ieee.org/document/11007677/ |
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| author | Joumana JOUMANA Daniel Castanheira Adao Silva Rui Dinis Atilio Gameiro |
| author_facet | Joumana JOUMANA Daniel Castanheira Adao Silva Rui Dinis Atilio Gameiro |
| author_sort | Joumana JOUMANA |
| collection | DOAJ |
| description | Cell-free (CF) massive multiple-input multiple-output (mMIMO) systems will revolutionize wireless communication by moving away from traditional base stations (BSs). By eliminating conventional cell boundaries, CF mMIMO deploys a large number of distributed access points (APs), enabling seamless connectivity across a wide area, more flexible resource allocation, and enhanced overall system performance. However, CF demands a significant amount of fronthaul signaling overhead due to its inherent nature (star topologies), which limits its practical application. In this regard, radio stripe (RS) is a promising and cost-efficient approach to deal with these issues, improving system efficiency and scalability. Not only RS, millimeter wave (mmWave) communications also represent a significant advancement in the evolution of wireless communication since it achieves multi-Giga bit per second (Gbps) data transfer rates. Still, mmWave requires beamforming to overcome the high path loss (PL) and shadowing effects. In this paper, we propose a new low-complexity hybrid analog-digital beamforming technique that addresses the challenges posed by wideband mmWave CF mMIMO RS-based systems. The APs hybrid equalizer is optimized, using as a metric, the mean squared error (MSE) between the transmitted and the AP received signals. The optimization is done over the radio stripe, i.e., at each AP, only local and side information from the former AP in the stripe is considered. Simulation results have shown that our proposed sequential hybrid algorithm achieves approximately the same performance as the centralized CF counterpart with a significant reduction in the signaling and information exchange requirements. |
| format | Article |
| id | doaj-art-2d57adb924c646ff9a48b7b6969be008 |
| institution | OA Journals |
| issn | 2169-3536 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj-art-2d57adb924c646ff9a48b7b6969be0082025-08-20T02:34:38ZengIEEEIEEE Access2169-35362025-01-0113904769048810.1109/ACCESS.2025.357177111007677Sequential Hybrid Beamforming for Radio StripesJoumana JOUMANA0https://orcid.org/0000-0002-3320-0370Daniel Castanheira1https://orcid.org/0000-0002-3858-2574Adao Silva2https://orcid.org/0000-0002-7008-6773Rui Dinis3https://orcid.org/0000-0002-8520-7267Atilio Gameiro4https://orcid.org/0000-0003-1565-7921Instituto de Telecomunicações (IT), Universidade de Aveiro, Aveiro, PortugalInstituto de Telecomunicações (IT), Universidade de Aveiro, Aveiro, PortugalInstituto de Telecomunicações (IT), Universidade de Aveiro, Aveiro, PortugalInstituto de Telecomunicacões (IT), Universidade Nova de Lisboa, Lisbon, PortugalInstituto de Telecomunicações (IT), Universidade de Aveiro, Aveiro, PortugalCell-free (CF) massive multiple-input multiple-output (mMIMO) systems will revolutionize wireless communication by moving away from traditional base stations (BSs). By eliminating conventional cell boundaries, CF mMIMO deploys a large number of distributed access points (APs), enabling seamless connectivity across a wide area, more flexible resource allocation, and enhanced overall system performance. However, CF demands a significant amount of fronthaul signaling overhead due to its inherent nature (star topologies), which limits its practical application. In this regard, radio stripe (RS) is a promising and cost-efficient approach to deal with these issues, improving system efficiency and scalability. Not only RS, millimeter wave (mmWave) communications also represent a significant advancement in the evolution of wireless communication since it achieves multi-Giga bit per second (Gbps) data transfer rates. Still, mmWave requires beamforming to overcome the high path loss (PL) and shadowing effects. In this paper, we propose a new low-complexity hybrid analog-digital beamforming technique that addresses the challenges posed by wideband mmWave CF mMIMO RS-based systems. The APs hybrid equalizer is optimized, using as a metric, the mean squared error (MSE) between the transmitted and the AP received signals. The optimization is done over the radio stripe, i.e., at each AP, only local and side information from the former AP in the stripe is considered. Simulation results have shown that our proposed sequential hybrid algorithm achieves approximately the same performance as the centralized CF counterpart with a significant reduction in the signaling and information exchange requirements.https://ieeexplore.ieee.org/document/11007677/Cell-free mMIMOradio stripslinear sequential processingmmWave frequencieshybrid analog-digital beamforming |
| spellingShingle | Joumana JOUMANA Daniel Castanheira Adao Silva Rui Dinis Atilio Gameiro Sequential Hybrid Beamforming for Radio Stripes IEEE Access Cell-free mMIMO radio strips linear sequential processing mmWave frequencies hybrid analog-digital beamforming |
| title | Sequential Hybrid Beamforming for Radio Stripes |
| title_full | Sequential Hybrid Beamforming for Radio Stripes |
| title_fullStr | Sequential Hybrid Beamforming for Radio Stripes |
| title_full_unstemmed | Sequential Hybrid Beamforming for Radio Stripes |
| title_short | Sequential Hybrid Beamforming for Radio Stripes |
| title_sort | sequential hybrid beamforming for radio stripes |
| topic | Cell-free mMIMO radio strips linear sequential processing mmWave frequencies hybrid analog-digital beamforming |
| url | https://ieeexplore.ieee.org/document/11007677/ |
| work_keys_str_mv | AT joumanajoumana sequentialhybridbeamformingforradiostripes AT danielcastanheira sequentialhybridbeamformingforradiostripes AT adaosilva sequentialhybridbeamformingforradiostripes AT ruidinis sequentialhybridbeamformingforradiostripes AT atiliogameiro sequentialhybridbeamformingforradiostripes |