Asymptotic Performance Analysis of Fluid Antenna Systems: An Extreme Value Theory Perspective
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866917098363551744 |
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| author | Zhang, Yi Wang, Jintao Shi, Zheng Wang, Xu Yang, Guanghua Ma, Shaodan Wong, Kai-Kit |
| author_facet | Zhang, Yi Wang, Jintao Shi, Zheng Wang, Xu Yang, Guanghua Ma, Shaodan Wong, Kai-Kit |
| contents | Fluid antenna systems (FAS) allow dynamic reconfiguration to achieve superior diversity gains and reliability. To quantify the performance scaling of FAS with a large number of antenna ports, this paper leverages extreme value theory (EVT) to conduct an asymptotic analysis of the outage probability (OP) and ergodic capacity (EC). The analysis reveals that the OP decays approximately exponentially with the number of antenna ports. Moreover, we establish upper and lower bounds for the asymptotic EC, uncovering its double-logarithmic scaling law. Furthermore, we re-substantiate these scaling laws by exploiting the fact that the mode of the Gumbel distribution scales logarithmically. Besides, we theoretically prove that spatial correlation among antenna ports degrades both OP and EC. All analytical findings are conclusively validated by numerical results. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_17916 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Asymptotic Performance Analysis of Fluid Antenna Systems: An Extreme Value Theory Perspective Zhang, Yi Wang, Jintao Shi, Zheng Wang, Xu Yang, Guanghua Ma, Shaodan Wong, Kai-Kit Information Theory Fluid antenna systems (FAS) allow dynamic reconfiguration to achieve superior diversity gains and reliability. To quantify the performance scaling of FAS with a large number of antenna ports, this paper leverages extreme value theory (EVT) to conduct an asymptotic analysis of the outage probability (OP) and ergodic capacity (EC). The analysis reveals that the OP decays approximately exponentially with the number of antenna ports. Moreover, we establish upper and lower bounds for the asymptotic EC, uncovering its double-logarithmic scaling law. Furthermore, we re-substantiate these scaling laws by exploiting the fact that the mode of the Gumbel distribution scales logarithmically. Besides, we theoretically prove that spatial correlation among antenna ports degrades both OP and EC. All analytical findings are conclusively validated by numerical results. |
| title | Asymptotic Performance Analysis of Fluid Antenna Systems: An Extreme Value Theory Perspective |
| topic | Information Theory |
| url | https://arxiv.org/abs/2511.17916 |