Available Degrees of Spatial Multiplexing of a Uniform Linear Array With Multiple Polarizations: A Holographic Perspective
The capabilities of multi-antenna technology have recently been significantly enhanced by the proliferation of extra large array architectures. The high dimensionality of these systems implies that communications take place in the near-field regime, which poses some questions as to their effective p...
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IEEE
2025-01-01
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| Series: | IEEE Open Journal of Signal Processing |
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| Online Access: | https://ieeexplore.ieee.org/document/10839310/ |
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| author | Xavier Mestre Adrian Agustin David Sarda |
| author_facet | Xavier Mestre Adrian Agustin David Sarda |
| author_sort | Xavier Mestre |
| collection | DOAJ |
| description | The capabilities of multi-antenna technology have recently been significantly enhanced by the proliferation of extra large array architectures. The high dimensionality of these systems implies that communications take place in the near-field regime, which poses some questions as to their effective performance even under simple line of sight configurations. In order to study these limitations, a uniform linear array (ULA) is considered here, the elements of which are three infinitesimal dipoles transmitting different signals in the three spatial dimensions. The receiver consists of a single element with three orthogonal infinitesimal dipoles and full channel state information is assumed to be available at both ends. A capacity analysis is presented when the number of elements of the ULA increases without bound while the interelement distance converges to zero, so that the total aperture length is kept asymptotically fixed. In particular, the total number of available spatial degrees of freedom is shown to depend crucially on the receiver position in space, and closed form expressions are provided for the different achievability regions. From the analysis it can be concluded that the use of three orthogonal polarizations at the transmitter guarantees the universal availability of at least two spatial streams everywhere. |
| format | Article |
| id | doaj-art-7eab870168ad4c969f9d8f4b036d44de |
| institution | Kabale University |
| issn | 2644-1322 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Open Journal of Signal Processing |
| spelling | doaj-art-7eab870168ad4c969f9d8f4b036d44de2025-02-11T00:01:50ZengIEEEIEEE Open Journal of Signal Processing2644-13222025-01-01610811710.1109/OJSP.2025.352932610839310Available Degrees of Spatial Multiplexing of a Uniform Linear Array With Multiple Polarizations: A Holographic PerspectiveXavier Mestre0https://orcid.org/0000-0002-9469-3332Adrian Agustin1https://orcid.org/0000-0002-5723-9739David Sarda2Information and Signal Processing for Intelligent Communications (ISPIC) research unit, Centre Tecnològic de Telecomunicacions de Catalunya (CTTC/CERCA), Castelldefels, Barcelona, SpainInformation and Signal Processing for Intelligent Communications (ISPIC) research unit, Centre Tecnològic de Telecomunicacions de Catalunya (CTTC/CERCA), Castelldefels, Barcelona, SpainInformation and Signal Processing for Intelligent Communications (ISPIC) research unit, Centre Tecnològic de Telecomunicacions de Catalunya (CTTC/CERCA), Castelldefels, Barcelona, SpainThe capabilities of multi-antenna technology have recently been significantly enhanced by the proliferation of extra large array architectures. The high dimensionality of these systems implies that communications take place in the near-field regime, which poses some questions as to their effective performance even under simple line of sight configurations. In order to study these limitations, a uniform linear array (ULA) is considered here, the elements of which are three infinitesimal dipoles transmitting different signals in the three spatial dimensions. The receiver consists of a single element with three orthogonal infinitesimal dipoles and full channel state information is assumed to be available at both ends. A capacity analysis is presented when the number of elements of the ULA increases without bound while the interelement distance converges to zero, so that the total aperture length is kept asymptotically fixed. In particular, the total number of available spatial degrees of freedom is shown to depend crucially on the receiver position in space, and closed form expressions are provided for the different achievability regions. From the analysis it can be concluded that the use of three orthogonal polarizations at the transmitter guarantees the universal availability of at least two spatial streams everywhere.https://ieeexplore.ieee.org/document/10839310/Holographic MIMOnear-field communicationsspatial multiplexingextra large antenna arrays |
| spellingShingle | Xavier Mestre Adrian Agustin David Sarda Available Degrees of Spatial Multiplexing of a Uniform Linear Array With Multiple Polarizations: A Holographic Perspective IEEE Open Journal of Signal Processing Holographic MIMO near-field communications spatial multiplexing extra large antenna arrays |
| title | Available Degrees of Spatial Multiplexing of a Uniform Linear Array With Multiple Polarizations: A Holographic Perspective |
| title_full | Available Degrees of Spatial Multiplexing of a Uniform Linear Array With Multiple Polarizations: A Holographic Perspective |
| title_fullStr | Available Degrees of Spatial Multiplexing of a Uniform Linear Array With Multiple Polarizations: A Holographic Perspective |
| title_full_unstemmed | Available Degrees of Spatial Multiplexing of a Uniform Linear Array With Multiple Polarizations: A Holographic Perspective |
| title_short | Available Degrees of Spatial Multiplexing of a Uniform Linear Array With Multiple Polarizations: A Holographic Perspective |
| title_sort | available degrees of spatial multiplexing of a uniform linear array with multiple polarizations a holographic perspective |
| topic | Holographic MIMO near-field communications spatial multiplexing extra large antenna arrays |
| url | https://ieeexplore.ieee.org/document/10839310/ |
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