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Joint Port Selection and Beamforming Design for Fluid Antenna Assisted Integrated Data and Energy Transfer

Long Zhang, Halvin Yang, Yizhe Zhao, Jie Hu

Abstract

Integrated data and energy transfer (IDET) has been of fundamental importance for providing both wireless data transfer (WDT) and wireless energy transfer (WET) services towards low-power devices. Fluid antenna (FA) is capable of exploiting the huge spatial diversity of the wireless channel to enhance the receive signal strength, which is more suitable for the tiny-size low-power devices having the IDET requirements. In this letter, a multiuser FA assisted IDET system is studied and the weighted energy harvesting power at energy receivers (ERs) is maximized by jointly optimizing the port selection and transmit beamforming design under imperfect channel state information (CSI), while the signal-to-interference-plus-noise ratio (SINR) constraint for each data receiver (DR) is satisfied. An efficient algorithm is proposed to obtain the suboptimal solutions for the non-convex problem. Simulation results evaluate the performance of the FA-IDET system, while also demonstrate that FA outperforms the multi-input-multi-output (MIMO) counterpart in terms of the IDET performance, as long as the port number is large enough.

Joint Port Selection and Beamforming Design for Fluid Antenna Assisted Integrated Data and Energy Transfer

Abstract

Integrated data and energy transfer (IDET) has been of fundamental importance for providing both wireless data transfer (WDT) and wireless energy transfer (WET) services towards low-power devices. Fluid antenna (FA) is capable of exploiting the huge spatial diversity of the wireless channel to enhance the receive signal strength, which is more suitable for the tiny-size low-power devices having the IDET requirements. In this letter, a multiuser FA assisted IDET system is studied and the weighted energy harvesting power at energy receivers (ERs) is maximized by jointly optimizing the port selection and transmit beamforming design under imperfect channel state information (CSI), while the signal-to-interference-plus-noise ratio (SINR) constraint for each data receiver (DR) is satisfied. An efficient algorithm is proposed to obtain the suboptimal solutions for the non-convex problem. Simulation results evaluate the performance of the FA-IDET system, while also demonstrate that FA outperforms the multi-input-multi-output (MIMO) counterpart in terms of the IDET performance, as long as the port number is large enough.
Paper Structure (10 sections, 15 equations, 4 figures, 1 algorithm)

This paper contains 10 sections, 15 equations, 4 figures, 1 algorithm.

Table of Contents

  1. Introduction
  2. System Model
  3. Wireless channel model
  4. Signal model
  5. Joint Port Selection and Beamforming Design
  6. Problem Formulation
  7. FA assisted IDET
  8. Low-complexity method
  9. Simulation Results
  10. Conclusion

Figures (4)

  • Figure 1: System model.
  • Figure 2: Weighted energy harvesting power at ERs versus the port number $N$ with different antenna size $W$.
  • Figure 3: Weighted energy harvesting power at ERs versus the SINR threshold with different antenna size $W$ and port number $N$.
  • Figure 4: Weighted energy harvesting power at ERs versus the SINR threshold with different $L$ and $\rho$.