Abstract:We propose a novel receiver architecture that preserves the performance benefits of multiport selection in fluid-antenna systems while requiring only a very small number of radio-frequency (RF) chains. The resulting fluid-antenna hybrid multiport (FAHM) receiver effectively decouples port selection from signal combining by integrating a low-complexity analog combining network similar to those used in conventional hybrid multiantenna designs. We develop a stopping criterion to determine the number of selected ports, which limits the performance loss associated with port selection, and then design the hybrid combiner for a given RF-chain budget. The FAHM architecture is evaluated in a multiuser set-up operating under slow fluid-antenna multiple access (FAMA). In this scenario, a FAHM implementation with only 2 RF chains showcases a performance comparable to a fully-digital conventional multiport scheme with a much larger number of RF chains. Additionally, the proposed receiver architecture attains over 60% reduction in computational burden when integrated with a novel efficient implementation of the state-of-the-art generalized-eigenvector port-selection method.
| Comments: | 12 pages, 8 figures, 1 table. This work has been submitted to the IEEE for publication |
| Subjects: | Information Theory (cs.IT); Signal Processing (eess.SP) |
| Cite as: | arXiv:2605.06958 [cs.IT] |
| (or arXiv:2605.06958v2 [cs.IT] for this version) | |
| https://doi.org/10.48550/arXiv.2605.06958 arXiv-issued DOI via DataCite |
From: F. Javier Lopez-Martinez [view email]
[v1]
Thu, 7 May 2026 21:23:23 UTC (402 KB)
[v2]
Fri, 22 May 2026 10:48:26 UTC (597 KB)
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