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Performance Analysis of Integrated Data and Energy Transfer Assisted by Fluid Antenna Systems

Xiao Lin, Halvin Yang, Yizhe Zhao, Jie Hu, Kai-Kit Wong

TL;DR

This work tackles joint wireless data transfer (WDT) and wireless energy transfer (WET) in dense networks by deploying fluid antenna multiple access (FAMA) with a time-switching (TS) scheme. It models a downlink system with $N$ fixed APs and $N$ UEs, each UE carrying a $K$-port fluid antenna of size $W\lambda$ and operating under a correlated channel marked by the parameter $\mu$, with TS allocating $\alpha$ fraction to WDT and $(1-\alpha)$ to WET. The authors derive approximated closed-form outage and throughput expressions for WDT, as well as outage and energy harvesting metrics for WET, using Gauss-Laguerre quadrature and Marcum Q-functions, and validate them via Monte Carlo simulations. Results show that FAMA IDET outperforms traditional MIMO with the same antenna budget, but optimal performance requires balancing the number of UEs $N$ and the TS ratio $\alpha$ to trade off WDT and WET performance in practical IDET deployments.

Abstract

Fluid antenna multiple access (FAMA) is capable of exploiting the high spatial diversity of wireless channels to mitigate multi-user interference via flexible port switching, which achieves a better performance than traditional multi-input-multi-output (MIMO) systems. Moreover, integrated data and energy transfer (IDET) is able to provide both the wireless data transfer (WDT) and wireless energy transfer (WET) services towards low-power devices. In this paper, a FAMA assisted IDET system is studied, where $N$ access points (APs) provide dedicated IDET services towards $N$ user equipments (UEs). Each UE is equipped with a single fluid antenna. The performance of WDT and WET , i.e., the WDT outage probability, the WET outage probability, the reliable throughput and the average energy harvesting amount, are analysed theoretically by using time switching (TS) between WDT and WET. Numerical results validate our theoretical analysis, which reveals that the number of UEs and TS ratio should be optimized to achieve a trade-off between the WDT and WET performance. Moreover, FAMA assisted IDET achieves a better performance in terms of both WDT and WET than traditional MIMO with the same antenna size.

Performance Analysis of Integrated Data and Energy Transfer Assisted by Fluid Antenna Systems

TL;DR

This work tackles joint wireless data transfer (WDT) and wireless energy transfer (WET) in dense networks by deploying fluid antenna multiple access (FAMA) with a time-switching (TS) scheme. It models a downlink system with fixed APs and UEs, each UE carrying a -port fluid antenna of size and operating under a correlated channel marked by the parameter , with TS allocating fraction to WDT and to WET. The authors derive approximated closed-form outage and throughput expressions for WDT, as well as outage and energy harvesting metrics for WET, using Gauss-Laguerre quadrature and Marcum Q-functions, and validate them via Monte Carlo simulations. Results show that FAMA IDET outperforms traditional MIMO with the same antenna budget, but optimal performance requires balancing the number of UEs and the TS ratio to trade off WDT and WET performance in practical IDET deployments.

Abstract

Fluid antenna multiple access (FAMA) is capable of exploiting the high spatial diversity of wireless channels to mitigate multi-user interference via flexible port switching, which achieves a better performance than traditional multi-input-multi-output (MIMO) systems. Moreover, integrated data and energy transfer (IDET) is able to provide both the wireless data transfer (WDT) and wireless energy transfer (WET) services towards low-power devices. In this paper, a FAMA assisted IDET system is studied, where access points (APs) provide dedicated IDET services towards user equipments (UEs). Each UE is equipped with a single fluid antenna. The performance of WDT and WET , i.e., the WDT outage probability, the WET outage probability, the reliable throughput and the average energy harvesting amount, are analysed theoretically by using time switching (TS) between WDT and WET. Numerical results validate our theoretical analysis, which reveals that the number of UEs and TS ratio should be optimized to achieve a trade-off between the WDT and WET performance. Moreover, FAMA assisted IDET achieves a better performance in terms of both WDT and WET than traditional MIMO with the same antenna size.
Paper Structure (11 sections, 6 theorems, 28 equations, 5 figures)

This paper contains 11 sections, 6 theorems, 28 equations, 5 figures.

Table of Contents

  1. Introduction
  2. System Model
  3. Wireless channel model
  4. IDET with TS approach
  5. Port slection
  6. Performance Analysis of the FAMA Assisted IDET System
  7. WDT Performance Analysis
  8. WET Performance Analysis
  9. Average energy harvesting amount
  10. Numerical Results
  11. Conclusion

Key Result

Lemma 1

The conditional cumulative density function (CDF) of $Y_1,\cdots,Y_K$ is given by where $Q_N(\cdot)$ is the $N$-order Marcum Q-function.

Figures (5)

  • Figure 1: System model of FAMA assisted IDET in the multi-user scenario.
  • Figure 2: Outage probability versus the number of users $N$.
  • Figure 3: Outage probability versus the number of ports $K$.
  • Figure 4: Reliable throughput against the SINR threshold $\gamma$.
  • Figure 5: Aaverage energy harvesting amount against the number of ports $K$.

Theorems & Definitions (6)

  • Lemma 1
  • Theorem 1
  • Lemma 2
  • Theorem 2
  • Theorem 3
  • Theorem 4