Hybrid Multiport Receivers for Slow Fluid Antenna Multiple Access

@misc{gonzalezcoma2026hybrid,
  title = {{Hybrid Multiport Receivers for Slow Fluid Antenna Multiple Access}},
  author = {José P. González-Coma and José David Vega-Sánchez and F. Javier López-Martínez},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2605.06958},
  eprint = {2605.06958},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2605.06958},
}

TY  - UNPB
TI  - Hybrid Multiport Receivers for Slow Fluid Antenna Multiple Access
AU  - José P. González-Coma
AU  - José David Vega-Sánchez
AU  - F. Javier López-Martínez
PY  - 2026
DA  - 2026/10/22
PB  - arXiv
DO  - 10.48550/arxiv.2605.06958
UR  - https://arxiv.org/abs/2605.06958
AB  - 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 an effective-port criterion to determine the selected-port dimension before hybrid combining, thereby limiting 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 Rank-1 implementation attains a reduction in average GEPort execution time by about two orders of magnitude.
ER  -