Hybrid Near/Far-Field Communications of RIS-Aided Cell-Free Massive MIMO With Visibility Region Detection
This paper analyzes visibility region (VR) detection and spectral efficiency (SE) in a reconfigurable intelligent surface (RIS)-aided cell-free massive multiple-input multiple-output (CF-mMIMO) system, with a focus on hybrid near-field (NF) and far-field (FF) communication. A statistical channel mod...
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| Format: | Article |
| Language: | English |
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IEEE
2025-01-01
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| Series: | IEEE Open Journal of the Communications Society |
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| Online Access: | https://ieeexplore.ieee.org/document/10891689/ |
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| author | Xiangjun Ma Ali Arshad Nasir Daniel Benevides Da Costa |
| author_facet | Xiangjun Ma Ali Arshad Nasir Daniel Benevides Da Costa |
| author_sort | Xiangjun Ma |
| collection | DOAJ |
| description | This paper analyzes visibility region (VR) detection and spectral efficiency (SE) in a reconfigurable intelligent surface (RIS)-aided cell-free massive multiple-input multiple-output (CF-mMIMO) system, with a focus on hybrid near-field (NF) and far-field (FF) communication. A statistical channel model is introduced, leveraging the Fresnel approximation and Rayleigh distance concepts. To enable VR detection using signals received from the radio-frequency (RF) chains of the RIS, a novel detection matrix based on the Welch-bound-equality (WBE) codebook is proposed. Its performance is thoroughly analyzed, with closed-form expressions derived for the probabilities of missed detection and false alarm. Based on the estimated VRs, a generalized expression for the estimated aggregated channel from the user equipment (UE) to the access point (AP) is derived using the linear minimum mean-squared-error (LMMSE) estimator, which supports SE analysis. To mitigate pilot contamination during VR detection and channel state information (CSI) estimation, a novel two-stage pilot assignment scheme is proposed. In the VR detection stage, orthogonal pilots are assigned to NF-UEs while FF-UEs remain silent, enhancing detection accuracy. In the CSI estimation stage, UE-AP cooperation is integrated with pilot assignment and power control, delivering superior SE performance compared to the group-based scheme. |
| format | Article |
| id | doaj-art-1b04ee4da62c4ac3a7bcb4ab5bf31e88 |
| institution | DOAJ |
| issn | 2644-125X |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Open Journal of the Communications Society |
| spelling | doaj-art-1b04ee4da62c4ac3a7bcb4ab5bf31e882025-08-20T03:18:09ZengIEEEIEEE Open Journal of the Communications Society2644-125X2025-01-0161710172610.1109/OJCOMS.2025.354339310891689Hybrid Near/Far-Field Communications of RIS-Aided Cell-Free Massive MIMO With Visibility Region DetectionXiangjun Ma0https://orcid.org/0000-0002-6104-4563Ali Arshad Nasir1https://orcid.org/0000-0001-5012-1562Daniel Benevides Da Costa2https://orcid.org/0000-0002-5439-7475Department of Electrical Engineering, Interdisciplinary Research Center for Communication Systems and Sensing, King Fahd University of Petroleum and Minerals, Dhahran, Saudi ArabiaDepartment of Electrical Engineering, Interdisciplinary Research Center for Communication Systems and Sensing, King Fahd University of Petroleum and Minerals, Dhahran, Saudi ArabiaDepartment of Electrical Engineering, Interdisciplinary Research Center for Communication Systems and Sensing, King Fahd University of Petroleum and Minerals, Dhahran, Saudi ArabiaThis paper analyzes visibility region (VR) detection and spectral efficiency (SE) in a reconfigurable intelligent surface (RIS)-aided cell-free massive multiple-input multiple-output (CF-mMIMO) system, with a focus on hybrid near-field (NF) and far-field (FF) communication. A statistical channel model is introduced, leveraging the Fresnel approximation and Rayleigh distance concepts. To enable VR detection using signals received from the radio-frequency (RF) chains of the RIS, a novel detection matrix based on the Welch-bound-equality (WBE) codebook is proposed. Its performance is thoroughly analyzed, with closed-form expressions derived for the probabilities of missed detection and false alarm. Based on the estimated VRs, a generalized expression for the estimated aggregated channel from the user equipment (UE) to the access point (AP) is derived using the linear minimum mean-squared-error (LMMSE) estimator, which supports SE analysis. To mitigate pilot contamination during VR detection and channel state information (CSI) estimation, a novel two-stage pilot assignment scheme is proposed. In the VR detection stage, orthogonal pilots are assigned to NF-UEs while FF-UEs remain silent, enhancing detection accuracy. In the CSI estimation stage, UE-AP cooperation is integrated with pilot assignment and power control, delivering superior SE performance compared to the group-based scheme.https://ieeexplore.ieee.org/document/10891689/Hybrid near/far-fieldCF-mMIMORISvisibility region |
| spellingShingle | Xiangjun Ma Ali Arshad Nasir Daniel Benevides Da Costa Hybrid Near/Far-Field Communications of RIS-Aided Cell-Free Massive MIMO With Visibility Region Detection IEEE Open Journal of the Communications Society Hybrid near/far-field CF-mMIMO RIS visibility region |
| title | Hybrid Near/Far-Field Communications of RIS-Aided Cell-Free Massive MIMO With Visibility Region Detection |
| title_full | Hybrid Near/Far-Field Communications of RIS-Aided Cell-Free Massive MIMO With Visibility Region Detection |
| title_fullStr | Hybrid Near/Far-Field Communications of RIS-Aided Cell-Free Massive MIMO With Visibility Region Detection |
| title_full_unstemmed | Hybrid Near/Far-Field Communications of RIS-Aided Cell-Free Massive MIMO With Visibility Region Detection |
| title_short | Hybrid Near/Far-Field Communications of RIS-Aided Cell-Free Massive MIMO With Visibility Region Detection |
| title_sort | hybrid near far field communications of ris aided cell free massive mimo with visibility region detection |
| topic | Hybrid near/far-field CF-mMIMO RIS visibility region |
| url | https://ieeexplore.ieee.org/document/10891689/ |
| work_keys_str_mv | AT xiangjunma hybridnearfarfieldcommunicationsofrisaidedcellfreemassivemimowithvisibilityregiondetection AT aliarshadnasir hybridnearfarfieldcommunicationsofrisaidedcellfreemassivemimowithvisibilityregiondetection AT danielbenevidesdacosta hybridnearfarfieldcommunicationsofrisaidedcellfreemassivemimowithvisibilityregiondetection |