University of Oulu

D. Kumar, O. L. Alcaraz López, S. K. Joshi and A. Tölli, "Latency-Aware Multi-Antenna SWIPT System With Battery-Constrained Receivers," in IEEE Transactions on Wireless Communications, vol. 22, no. 5, pp. 3022-3037, May 2023, doi: 10.1109/TWC.2022.3215864.

Latency-aware multi-antenna SWIPT system with battery-constrained receivers

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Author: Kumar, Dileep1; Alcaraz López, Onel L.1; Joshi, Satya Krishna1;
Organizations: 1Centre for Wireless Communications (CWC), University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.5 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2023
Publish Date: 2023-08-29


Power splitting (PS) based simultaneous wireless information and power transfer (SWIPT) is considered in a multi-user multiple-input-single-output broadcast scenario. Specifically, we focus on jointly configuring the transmit beamforming vectors and receive PS ratios to minimize the total transmit energy of the base station under the user-specific latency and energy harvesting (EH) requirements. The battery depletion phenomenon is avoided by preemptively incorporating information regarding the receivers’ battery state and EH fluctuations into the resource allocation design. The resulting time-average sum-power minimization problem is temporally correlated, non-convex (including mutually coupled latency-battery queue dynamics), and in general intractable. We use the Lyapunov optimization framework and derive a dynamic control algorithm to transform the original problem into a sequence of per-time-slot deterministic and independent subproblems. The latter are then solved via two alternative approaches: i) semidefinite relaxation combined with fractional programming, and ii) successive convex approximation. Furthermore, we design a low-complexity closed-form iterative algorithm exploiting the Karush-Kuhn-Tucker optimality conditions for a specific scenario with delay bounded batteryless receivers. Numerical results provide insights on the robustness of the proposed designs to realize an energy-efficient SWIPT system while ensuring latency and EH requirements in a time dynamic network.

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Series: IEEE transactions on wireless communications
ISSN: 1536-1276
ISSN-E: 1558-2248
ISSN-L: 1536-1276
Volume: 22
Issue: 5
Pages: 3022 - 3037
DOI: 10.1109/TWC.2022.3215864
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work was supported in part by the European Commission in the framework of the H2020-EUJ-02-2018 Project, 5G-Enhance, under Grant 815056; and in part by the Academy of Finland, 6Genesis Flagship, under Grant 346208. The work of Dileep Kumar was supported in part by the Finnish Foundation for Technology Promotion and in part by the Tauno Tönningin Säätiön Foundation. The work of Onel L. Alcaraz López was supported in part by the Finnish Foundation for Technology Promotion.
EU Grant Number: (815056) 5G-Enhance - 5G Enhanced Mobile Broadband Access Networks in Crowded Environments
Academy of Finland Grant Number: 346208
Detailed Information: 346208 (Academy of Finland Funding decision)
Copyright information: This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see