Interference Minimization in Beyond-Diagonal RIS-Assisted MIMO Interference Channels
This paper proposes a two-stage approach for passive and active beamforming in multiple-input multiple-output (MIMO) interference channels (ICs) assisted by a beyond-diagonal reconfigurable intelligent surface (BD-RIS). In the first stage, the passive BD-RIS is designed to minimize the aggregate int...
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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 Vehicular Technology |
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| Online Access: | https://ieeexplore.ieee.org/document/10943135/ |
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| author | Ignacio Santamaria Mohammad Soleymani Eduard Jorswieck Jesus Gutierrez |
| author_facet | Ignacio Santamaria Mohammad Soleymani Eduard Jorswieck Jesus Gutierrez |
| author_sort | Ignacio Santamaria |
| collection | DOAJ |
| description | This paper proposes a two-stage approach for passive and active beamforming in multiple-input multiple-output (MIMO) interference channels (ICs) assisted by a beyond-diagonal reconfigurable intelligent surface (BD-RIS). In the first stage, the passive BD-RIS is designed to minimize the aggregate interference power at all receivers, a cost function called interference leakage (IL). To this end, we propose an optimization algorithm in the manifold of unitary matrices and a suboptimal but computationally efficient solution. In the second stage, users' active precoders are designed under different criteria such as minimizing the IL (min-IL), maximizing the signal-to-interference-plus-noise ratio (max-SINR), or maximizing the sum rate (max-SR). The residual interference not cancelled by the BD-RIS is treated as noise by the precoders. Our simulation results show that the max-SR precoders provide more than <inline-formula><tex-math notation="LaTeX">$20\%$</tex-math></inline-formula> sum rate improvement compared to other designs, especially when the BD-RIS has a moderate number of elements and users transmit with high power, in which case the residual interference is still significant. |
| format | Article |
| id | doaj-art-aeb53a4738be4e0da90d7c89f3cb07b4 |
| institution | OA Journals |
| issn | 2644-1330 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Open Journal of Vehicular Technology |
| spelling | doaj-art-aeb53a4738be4e0da90d7c89f3cb07b42025-08-20T02:27:16ZengIEEEIEEE Open Journal of Vehicular Technology2644-13302025-01-0161005101710.1109/OJVT.2025.355542510943135Interference Minimization in Beyond-Diagonal RIS-Assisted MIMO Interference ChannelsIgnacio Santamaria0https://orcid.org/0000-0003-0040-7436Mohammad Soleymani1https://orcid.org/0000-0003-2770-7236Eduard Jorswieck2https://orcid.org/0000-0001-7893-8435Jesus Gutierrez3https://orcid.org/0000-0002-7836-5080Department of Communications Engineering, Universidad de Cantabria, Santander, SpainSignal and System Theory Group, Universität Paderborn, Paderborn, GermanyInstitute for Communications Technology, Technische Universität Braunschweig, Braunschweig, GermanyIHP - Leibniz-Institut für Innovative Mikroelektronik, Frankfurt (Oder), GermanyThis paper proposes a two-stage approach for passive and active beamforming in multiple-input multiple-output (MIMO) interference channels (ICs) assisted by a beyond-diagonal reconfigurable intelligent surface (BD-RIS). In the first stage, the passive BD-RIS is designed to minimize the aggregate interference power at all receivers, a cost function called interference leakage (IL). To this end, we propose an optimization algorithm in the manifold of unitary matrices and a suboptimal but computationally efficient solution. In the second stage, users' active precoders are designed under different criteria such as minimizing the IL (min-IL), maximizing the signal-to-interference-plus-noise ratio (max-SINR), or maximizing the sum rate (max-SR). The residual interference not cancelled by the BD-RIS is treated as noise by the precoders. Our simulation results show that the max-SR precoders provide more than <inline-formula><tex-math notation="LaTeX">$20\%$</tex-math></inline-formula> sum rate improvement compared to other designs, especially when the BD-RIS has a moderate number of elements and users transmit with high power, in which case the residual interference is still significant.https://ieeexplore.ieee.org/document/10943135/Beyond-diagonal reconfigurable intelligent surfacemulti-antenna communicationsinterference leakageinterference channelmanifold optimization |
| spellingShingle | Ignacio Santamaria Mohammad Soleymani Eduard Jorswieck Jesus Gutierrez Interference Minimization in Beyond-Diagonal RIS-Assisted MIMO Interference Channels IEEE Open Journal of Vehicular Technology Beyond-diagonal reconfigurable intelligent surface multi-antenna communications interference leakage interference channel manifold optimization |
| title | Interference Minimization in Beyond-Diagonal RIS-Assisted MIMO Interference Channels |
| title_full | Interference Minimization in Beyond-Diagonal RIS-Assisted MIMO Interference Channels |
| title_fullStr | Interference Minimization in Beyond-Diagonal RIS-Assisted MIMO Interference Channels |
| title_full_unstemmed | Interference Minimization in Beyond-Diagonal RIS-Assisted MIMO Interference Channels |
| title_short | Interference Minimization in Beyond-Diagonal RIS-Assisted MIMO Interference Channels |
| title_sort | interference minimization in beyond diagonal ris assisted mimo interference channels |
| topic | Beyond-diagonal reconfigurable intelligent surface multi-antenna communications interference leakage interference channel manifold optimization |
| url | https://ieeexplore.ieee.org/document/10943135/ |
| work_keys_str_mv | AT ignaciosantamaria interferenceminimizationinbeyonddiagonalrisassistedmimointerferencechannels AT mohammadsoleymani interferenceminimizationinbeyonddiagonalrisassistedmimointerferencechannels AT eduardjorswieck interferenceminimizationinbeyonddiagonalrisassistedmimointerferencechannels AT jesusgutierrez interferenceminimizationinbeyonddiagonalrisassistedmimointerferencechannels |