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Fluid Antenna Relay (FAR)-assisted Communication with Hybrid Relaying Scheme Selection

Ruopeng Xu, Songling Zhang, Zhaohui Yang, Mingzhe Chen, Zhaoyang Zhang, Kai-Kit Wong

TL;DR

A sum-rate maximization problem to mitigate the rate loss introduced by the half-duplex mode of a fluid antenna relay (FAR) communication system with hybrid relaying scheme selection utilizing a Gaussian copula-based method.

Abstract

In this paper, we investigate a fluid antenna relay (FAR)-assisted communication system with hybrid relaying scheme selection. By leveraging statistical channel state information (CSI) and distribution characteristics of fluid antenna system (FAS), we approximate the outage probability (OP) with different relaying schemes utilizing a Gaussian copula-based method. Each relay node follows the OP-minimized principle to choose the forwarding schemes. To reduce self-interference and avoid multi-user interference, half-duplex relays and frequency division multiple access schemes are considered, respectively. On this basis, we formulate a sum-rate maximization problem to mitigate the rate loss introduced by the half-duplex mode. To solve this problem, we first transform the original nonconvex problem into a power control optimization problem by obtaining the closed form of bandwidth allocation and substituting it into the original problem. Then, we solve the power control optimization problem with a low complexity method. Simulation results verify the effectiveness of our proposed algorithm to improve the sum rate of the system.

Fluid Antenna Relay (FAR)-assisted Communication with Hybrid Relaying Scheme Selection

TL;DR

A sum-rate maximization problem to mitigate the rate loss introduced by the half-duplex mode of a fluid antenna relay (FAR) communication system with hybrid relaying scheme selection utilizing a Gaussian copula-based method.

Abstract

In this paper, we investigate a fluid antenna relay (FAR)-assisted communication system with hybrid relaying scheme selection. By leveraging statistical channel state information (CSI) and distribution characteristics of fluid antenna system (FAS), we approximate the outage probability (OP) with different relaying schemes utilizing a Gaussian copula-based method. Each relay node follows the OP-minimized principle to choose the forwarding schemes. To reduce self-interference and avoid multi-user interference, half-duplex relays and frequency division multiple access schemes are considered, respectively. On this basis, we formulate a sum-rate maximization problem to mitigate the rate loss introduced by the half-duplex mode. To solve this problem, we first transform the original nonconvex problem into a power control optimization problem by obtaining the closed form of bandwidth allocation and substituting it into the original problem. Then, we solve the power control optimization problem with a low complexity method. Simulation results verify the effectiveness of our proposed algorithm to improve the sum rate of the system.
Paper Structure (12 sections, 31 equations, 3 figures)

This paper contains 12 sections, 31 equations, 3 figures.

Table of Contents

  1. Introduction
  2. System Model
  3. Fluid Antenna Relay Model
  4. Communication Model
  5. Problem Formulation
  6. Algorithm Design
  7. OP analysis-based method for relaying scheme selection
  8. Sum-rate Maximization
  9. Bandwidth allocation optimization
  10. Power control optimization
  11. Numerical Simulation
  12. Conclusion

Figures (3)

  • Figure 1: System model of the proposed communication system.
  • Figure 2: (a) Outage probability using AF scheme for relaying, (b) Outage probability using DF scheme for relaying, and (c) Value of selection number $\mu_k$.
  • Figure 3: Sum rate of the system versus (a) Number of users, (b) Number of ports, (c) Maximum transmit power of FAR.

Theorems & Definitions (4)

  • Proof 1
  • Proof 2
  • Proof 3
  • Proof 4