Simultaneous Wireless Power and Data Transfer System With Full-Duplex Mode Based on Half-Cycle OFDM

A simultaneous wireless power and data transfer system (SWPDT) with full-duplex mode based on half-cycle orthogonal frequency division multiplexing (OFDM) technology is proposed to suppress interference from the power and ipsilateral carriers. The power carrier is regarded as the subcarrier carrying all the “1” data, which is used as the reference frequency, and the data subcarrier frequencies are determined according to the orthogonal properties of the power and data carriers to achieve full-duplex transmission. Demodulation integration cycle is reduced to half of the fundamental wave period, which doubles the data transmission rate. Depending on the proposed OFDM-based modulation and demodulation scheme, there is no need to use additional topologies to suppress interference from the power carrier and crosstalk from ipsilateral data source. In this article, simplified models of power and data transmission channels are developed, analyzed, and optimized to improve the data transmission gain. Finally, a 220 W experimental prototype was built, and tests show that the full-duplex communication rate could reach 170 kbps, which validates the correctness and effectiveness of the proposed SWPDT system.