Joint interference alignment and beyond diagonal RIS design for maximizing SNR in MIMO device-to-device communications
Abstract As a novel and flexible branch of RIS architectures, beyond-diagonal reconfigurable intelligent surface (BD-RIS) has been proposed recently to manipulate wireless environment and expand the coverage benefits. One efficient BD-RIS has been realized in the form of a unitary and symmetric RIS...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-05-01
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| Series: | Scientific Reports |
| Subjects: | |
| Online Access: | https://doi.org/10.1038/s41598-025-03026-3 |
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| Summary: | Abstract As a novel and flexible branch of RIS architectures, beyond-diagonal reconfigurable intelligent surface (BD-RIS) has been proposed recently to manipulate wireless environment and expand the coverage benefits. One efficient BD-RIS has been realized in the form of a unitary and symmetric RIS matrix in the existing research. However, it is still not clear whether interference alignment can improve BD-RIS aided system performance yet. In this paper, the joint optimization of interference alignment (IA) beamforming and phase-shift matrix of BD-RIS is investigated to maximize the signal-to-noise ratio (SNR), where a K-user RIS-aided multiple-input multiple-output (MIMO) device-to-device (D2D) communications system is considered. Numerical results show that the proposed algorithm can achieve a higher sum-rate compared to that of the conventional diagonal RIS and without RIS strategies. |
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| ISSN: | 2045-2322 |