FA-Aided SWIPT Systems With SIC Capabilities: A Stochastic Geometry Copula-Based Framework

The co-design of fluid antenna (FA) technology and simultaneous wireless information and power transfer (SWIPT) can be jointly beneficial. Specifically, SWIPT facilitates both data and energy transfer to low-power devices, while FA technology introduces a new dimension for optimizing SWIPT performance through intelligent port selection. Thus, in this work, we develop an analytical framework by employing stochastic geometry and copula theory to evaluate FA-enabled users’ performance in SWIPT networks. All users utilize successive interference cancellation and two novel port selection schemes, namely information decoding-focused (IDf) and energy harvest-focused (EHf), to leverage FAs’ liquid dimension for enhanced data or energy transfer, by considering the counterposed effects of multi-user interference. We derive closed-form expressions for signal-to-interference ratio and received signal power under correlated Nakagami-<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\kappa $ </tex-math></inline-formula> fading by using Student’s t copula. The developed framework assesses SWIPT performance meta-distribution of the proposed schemes and facilitates the performance evaluation of two user location-based classifications i.e., cell-center (CC) and cell-edge (CE) users. Results reveal the beneficial synergy of FAs and SWIPT, with around 29% improvement for CC and 133% for CE users compared to conventional static SWIPT communications, and highlight that the EHf scheme proves more efficient for CE users, while the IDf scheme benefits CC users.