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September 29, 2025Open Access

Low-Complexity Beamforming Design for Null Space-based Simultaneous Wireless Information and Power Transfer Systems

Key Points

Computational complexity reduced by 97.5% and 99.96% in two different cases, demonstrating significant improvements.
The proposed algorithm simplifies SWIPT by addressing both wireless information and energy transfer challenges simultaneously.
Dedicated energy beamforming was shown to be unnecessary, enhancing system efficiency with lower design complexity.
The low-complexity approach allows for efficient operational lifetimes of IoT devices in future 6G networks.

Abstract

Simultaneous wireless information and power transfer (SWIPT) is a promising technology for the upcoming sixth-generation (6G) communication networks, enabling internet of things (IoT) devices and sensors to extend their operational lifetimes. In this paper, we propose a SWIPT scheme by projecting the interference signals from both intra-wireless information transfer (WIT) and inter-wireless energy transfer (WET) into the null space, simplifying the system into a point-to-point WIT and WET problem. Upon further analysis, we confirm that dedicated energy beamforming is unnecessary. In addition, we develop a low-complexity algorithm to solve the problem efficiently, further reducing computational overhead. Numerical results validate our analysis, showing that the computational complexity is reduced by 97. 5\% and 99. 96\% for the cases of KI = KE = 2, M = 4 and KI = KE = 16, M = 64, respectively.

Low-Complexity Beamforming Design for Null Space-based Simultaneous Wireless Information and Power Transfer Systems

Key Points

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