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On Performance of FAS-aided Wireless Powered NOMA Communication Systems

Farshad Rostami Ghadi, Masoud Kaveh, Kai-Kit Wong, Riku Jantti, Zheng Yan

TL;DR

In a wireless powered communication network, the transmitter is powered by a remote power beacon and serves two NOMA-enabled planar FAS users over Rayleigh channels. The authors develop a Gaussian copula-based framework to model the maximum per-user FAS channel gain $g_{ ext{fas},i}$ and derive outage-probability expressions in terms of a multivariate normal CDF, along with high-SNR asymptotics. Key contributions include a closed-form expression for $F_{g_{ ext{fas},i}}$ via the Gaussian copula, OP expressions for both strong and weak users, and asymptotic OP insights; simulations show that activating a single FAS port can significantly outperform traditional TAS in NOMA-WPCNs. The work demonstrates that FAS-enabled diversity and spatial multiplexing substantially improve reliability and energy efficiency, informing port-selection and deployment strategies for future 6G WET systems.

Abstract

This paper studies the performance of a wireless powered communication network (WPCN) under the non-orthogonal multiple access (NOMA) scheme, where users take advantage of an emerging fluid antenna system (FAS). More precisely, we consider a scenario where a transmitter is powered by a remote power beacon (PB) to send information to the planar NOMA FAS-equipped users through Rayleigh fading channels. After introducing the distribution of the equivalent channel coefficients to the users, we derive compact analytical expressions for the outage probability (OP) in order to evaluate the system performance. Additionally, we present asymptotic OP in the high signal-to-noise ratio (SNR) regime. Eventually, results reveal that deploying the FAS with only one activated port in NOMA users can significantly enhance the WPCN performance compared with using traditional antenna systems (TAS).

On Performance of FAS-aided Wireless Powered NOMA Communication Systems

TL;DR

In a wireless powered communication network, the transmitter is powered by a remote power beacon and serves two NOMA-enabled planar FAS users over Rayleigh channels. The authors develop a Gaussian copula-based framework to model the maximum per-user FAS channel gain and derive outage-probability expressions in terms of a multivariate normal CDF, along with high-SNR asymptotics. Key contributions include a closed-form expression for via the Gaussian copula, OP expressions for both strong and weak users, and asymptotic OP insights; simulations show that activating a single FAS port can significantly outperform traditional TAS in NOMA-WPCNs. The work demonstrates that FAS-enabled diversity and spatial multiplexing substantially improve reliability and energy efficiency, informing port-selection and deployment strategies for future 6G WET systems.

Abstract

This paper studies the performance of a wireless powered communication network (WPCN) under the non-orthogonal multiple access (NOMA) scheme, where users take advantage of an emerging fluid antenna system (FAS). More precisely, we consider a scenario where a transmitter is powered by a remote power beacon (PB) to send information to the planar NOMA FAS-equipped users through Rayleigh fading channels. After introducing the distribution of the equivalent channel coefficients to the users, we derive compact analytical expressions for the outage probability (OP) in order to evaluate the system performance. Additionally, we present asymptotic OP in the high signal-to-noise ratio (SNR) regime. Eventually, results reveal that deploying the FAS with only one activated port in NOMA users can significantly enhance the WPCN performance compared with using traditional antenna systems (TAS).
Paper Structure (9 sections, 3 theorems, 22 equations, 3 figures)

This paper contains 9 sections, 3 theorems, 22 equations, 3 figures.

Table of Contents

  1. Introduction
  2. System Model
  3. Chanel Model
  4. NOMA-FAS Scheme
  5. Performance Analysis
  6. Statistical Characteristics
  7. OP Analysis
  8. Numerical Results
  9. Conclusion

Key Result

Theorem 1

The OP for the strong FAS-equipped user $\mathrm{u}_1$ over the considered FAS-aided WPCN is given by eq-op1, in which

Figures (3)

  • Figure 1: System model: FAS-aided WPCN.
  • Figure 2: OP versus $\overline{\gamma}$ for the strong and weak NOMA FAS-equipped users $\mathrm{u_1}$ and $\mathrm{u_2}$ (a) when $W_\mathrm{u_1}=W_\mathrm{u_2}=1 \lambda^2$; (b) when $N_\mathrm{u_1}=N_\mathrm{u_2}=25$.
  • Figure 3: (a) OP versus $N_i$ for the strong and weak NOMA FAS-equipped users $\mathrm{u_1}$ and $\mathrm{u_2}$ when $W_\mathrm{u_1}=W_\mathrm{u_2}=1\lambda^2$ and $\overline{\gamma}=55$dB; (b) OP versus $W_i$ for the strong and weak NOMA FAS-equipped users $\mathrm{u_1}$ and $\mathrm{u_2}$ when $N_\mathrm{u_1}=N_\mathrm{u_2}=25$ and $\overline{\gamma}=55$dB.

Theorems & Definitions (6)

  • Theorem 1
  • proof
  • Theorem 2
  • proof
  • Corollary 1
  • proof