Phase-mismatched STAR-RIS with FAS-assisted RSMA Users
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arXiv
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| Autores principales: | , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| author | Ghadi, Farshad Rostami Wong, Kai-Kit Kaveh, Masoud Lopez-Martinez, F. Javier Liu, Yuanwei Chae, Chan-Byoung Murch, Ross |
| author_facet | Ghadi, Farshad Rostami Wong, Kai-Kit Kaveh, Masoud Lopez-Martinez, F. Javier Liu, Yuanwei Chae, Chan-Byoung Murch, Ross |
| contents | This paper considers communication between a base station (BS) to two users, each from one side of a simultaneously transmitting-reflecting reconfigurable intelligent surface (STAR-RIS) in the absence of a direct link. Rate-splitting multiple access (RSMA) strategy is employed and the STAR-RIS is subjected to phase errors. The users are equipped with a planar fluid antenna system (FAS) with position reconfigurability for spatial diversity. First, we derive the distribution of the equivalent channel gain at the FAS-equipped users, characterized by a t-distribution. We then obtain analytical expressions for the outage probability (OP) and average capacity (AC), with the latter obtained via a heuristic approach. Our findings highlight the potential of FAS to mitigate phase imperfections in STAR-RIS-assisted communications, significantly enhancing system performance compared to traditional antenna systems (TAS). Also, we quantify the impact of practical phase errors on system efficiency, emphasizing the importance of robust strategies for next-generation wireless networks. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_08986 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Phase-mismatched STAR-RIS with FAS-assisted RSMA Users Ghadi, Farshad Rostami Wong, Kai-Kit Kaveh, Masoud Lopez-Martinez, F. Javier Liu, Yuanwei Chae, Chan-Byoung Murch, Ross Information Theory Signal Processing This paper considers communication between a base station (BS) to two users, each from one side of a simultaneously transmitting-reflecting reconfigurable intelligent surface (STAR-RIS) in the absence of a direct link. Rate-splitting multiple access (RSMA) strategy is employed and the STAR-RIS is subjected to phase errors. The users are equipped with a planar fluid antenna system (FAS) with position reconfigurability for spatial diversity. First, we derive the distribution of the equivalent channel gain at the FAS-equipped users, characterized by a t-distribution. We then obtain analytical expressions for the outage probability (OP) and average capacity (AC), with the latter obtained via a heuristic approach. Our findings highlight the potential of FAS to mitigate phase imperfections in STAR-RIS-assisted communications, significantly enhancing system performance compared to traditional antenna systems (TAS). Also, we quantify the impact of practical phase errors on system efficiency, emphasizing the importance of robust strategies for next-generation wireless networks. |
| title | Phase-mismatched STAR-RIS with FAS-assisted RSMA Users |
| topic | Information Theory Signal Processing |
| url | https://arxiv.org/abs/2503.08986 |