Randomized Control of Wireless Temporal Coherence via Reconfigurable Intelligent Surface
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arXiv
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| Hauptverfasser: | , , , , |
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| Format: | Preprint |
| Veröffentlicht: |
2023
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| _version_ | 1866916988418260992 |
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| author | de Souza, João Henrique Inacio Croisfelt, Victor Saggese, Fabio Abrão, Taufik Popovski, Petar |
| author_facet | de Souza, João Henrique Inacio Croisfelt, Victor Saggese, Fabio Abrão, Taufik Popovski, Petar |
| contents | A reconfigurable intelligent surface (RIS) can shape the wireless propagation channel by inducing controlled phase shift variations to the impinging signals. Multiple works have considered the use of RIS by time-varying configurations of reflection coefficients. In this work we use the RIS to control the channel coherence time and introduce a generalized discrete-time-varying channel model for RIS-aided systems. We characterize the temporal variation of channel correlation by assuming that a configuration of RIS' elements changes at every time step. The analysis converges to a randomized framework to control the channel coherence time by setting the number of RIS' elements and their phase shifts. The main result is a framework for a flexible block-fading model, where the number of samples within a coherence block can be dynamically adapted. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2302_00074 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Randomized Control of Wireless Temporal Coherence via Reconfigurable Intelligent Surface de Souza, João Henrique Inacio Croisfelt, Victor Saggese, Fabio Abrão, Taufik Popovski, Petar Information Theory Signal Processing A reconfigurable intelligent surface (RIS) can shape the wireless propagation channel by inducing controlled phase shift variations to the impinging signals. Multiple works have considered the use of RIS by time-varying configurations of reflection coefficients. In this work we use the RIS to control the channel coherence time and introduce a generalized discrete-time-varying channel model for RIS-aided systems. We characterize the temporal variation of channel correlation by assuming that a configuration of RIS' elements changes at every time step. The analysis converges to a randomized framework to control the channel coherence time by setting the number of RIS' elements and their phase shifts. The main result is a framework for a flexible block-fading model, where the number of samples within a coherence block can be dynamically adapted. |
| title | Randomized Control of Wireless Temporal Coherence via Reconfigurable Intelligent Surface |
| topic | Information Theory Signal Processing |
| url | https://arxiv.org/abs/2302.00074 |