Time-Division-Based Simultaneous Wireless Information and Power Transfer Using Multifunctional Receiver

초록

Simultaneous wireless information and power transfer (SWIPT) has attracted growing interest as a key technique that enables the concurrent transmission of information and power over wireless channels. Conventional SWIPT systems have widely adopted continuous wave (CW) signals, whereas recent studies have proposed high peak-to-average power ratio (PAPR) waveforms to improve rectification efficiency. However, such methods suffer from inconsistent power transmission due to signal characteristics varying with the information content, and may lead to inefficient use of time resources. In this paper, we propose a time-division (TD)-SWIPT scheme that alternately transmits high-PAPR power signals and low-PAPR information signals. The proposed scheme improves RF-to-DC conversion efficiency and reduces amplifier-induced distortion, while temporal separation eliminates idle time and ensures independence between information and power signals. Here, we design a multifunctional receiver capable of separating information and power signals within a single circuit without the need for a power divider or RF switch. Unlike conventional receivers that rely on power splitting (PS) or time switching (TS) receivers, the proposed receiver overcomes limitations such as requiring fixed energy division or an inability to harvest energy and demodulate simultaneously. We demonstrate the proposed scheme via simulation and measurement. To evaluate the performance of the proposed scheme, the information signal is generated using binary phase-shift keying (BPSK) modulation, and the power signal is implemented as a Gaussian-modulated pulse. Consequently, the scheme achieves a maximum rectification efficiency of 66.1%, outperforming the 62% achieved by the CW signal, and maintains low bit error rates across various SNR levels.

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