A fluid antenna system (FAS) can improve both energy harvesting and data transmission in wireless powered communication (WPC) by exploiting spatial diversity with a single RF chain. In this letter, we study the outage probability of a FAS-assisted WPC network under the port selection criterion that maximizes the product of the channel gains of the two links. Adopting the block-correlation (BC) decomposition fitted to the Jakes’ autocorrelation function, we derive a semi-analytical outage expression via nested Gauss–Chebyshev quadrature with singularity-removing variable substitutions. Numerical results under the exact Jakes’ correlation confirm the analytical predictions and show that exploiting both links in port selection yields much lower outage probabilities than single-link selection. Moreover, the advantage becomes more pronounced as the aperture increases, and for sufficiently large apertures it further increases with the number of ports. For the considered settings, significant diversity gains from increasing the number of ports are observed at $W=4\lambda $ .
Zhen-Guan Wu, Xia-Zhi Lai, Jun-Teng Yao et al.· IEEE Wireless Communications...· 0 citations
This paper investigates a fluid active reconfigurable intelligent surface (FARIS)-aided downlink non-orthogonal multiple access (NOMA) system. We formulate a network sum-rate maximization problem that jointly optimizes user clustering, NOMA power allocation, FARIS amplification gains, discrete phase shifts, and fluid element selection under quality-of-service, reflected-power, and hardware constraints. To address the resulting nonconvex mixed-integer problem, we develop a two-stage framework comprising distance-based interleaved clustering for constructing successive-interference-cancellation (SIC)-friendly user groups and per-cluster alternating optimization. The resulting subproblems are handled using geometric programming (GP), fractional programming (FP), majorization-minimization (MM) with mixed-integer phase optimization, and the cross-entropy method (CEM). Numerical results demonstrate rapid convergence, near-optimal performance relative to brute-force search (BFS)-based optimum, and consistently outperforms the benchmarks. These results verify the effectiveness of jointly integrating FARIS and NOMA for high-rate downlink transmission.
Hong-Bae Jeon, Tuo Wu· 0 citations
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