Signal Conditioning for Selective OFDM SWIPT Systems

Abstract

The conversion efficiency of a harvesting component can hinder device self-sustainability. Countering this inefficiency can be a rigorous task that requires either a modified input waveform at the harvesting component or an improved design of the harvesting component itself. This paper considers a selective orthogonal frequency division multiplexing (OFDM) system that is designed for simultaneous wireless information and power transfer (SWIPT). This paper introduces an enhanced transmitter architecture designed to condition the transmit signal for improved conversion efficiency. Leveraging the structure of the OFDM signal, the cyclic prefix plus a portion of the information signal are conditioned and used for harvesting. Then, a rectifier model and prototypes are designed to further improve conversion efficiency. System performance is evaluated with the analytical derivation of the rate-energy (R-E) tradeoff and an optimized transmission strategy for system self-sustainability. Monte Carlo simulations show increased energy gains and full self-sustainability with the introduction of signal conditioning.

Study of Simultaneous Wireless Information and Power Transfer (SWIPT) in 5G - IoT

“…The implementation of cellular systems featuring small cells, substantial MIMO antenna con gurations, and millimeter wave technologies posits a promising solution to mitigate the impact of the current path-loss phenomenon. This assertion is supported by the literature [3].…”

“…Consistently, the dual-band antenna may be installed on the terminal end of the equipment. Time Switching: A co-receiver arrangement with a TS procedure in which, for a given time period the RF ag is completely utilized for energy harvesting or information decoding [3].…”

“…RF signals have been conventionally utilized for conveying information, and therefore, have the potential to be utilized for wireless power transfer (WPT) with e cacy. Moreover, due to the fact that radio frequency (RF) signals possess the ability to transmit both energy and information, considerable research efforts have been directed toward exploring the phenomenon of SWIPT [3]. Thus SWIPT facilitates inter-device communication and ensures a continuous source of energy.…”