Abstract
We propose a two-tone Frequency Shift Keying (FSK) modulation scheme that is suited for simultaneous efficient wireless power transfer and data transfer (SWIPT), by exploiting non-linearities of the rectifier. The result is a spectrum and hardware efficient solution: data and energy are jointly transmitted in the air, and are received by the same hardware. We elaborate on a Fourier transformation-based non-coherent FSK receiver for the proposed scheme and show the theoretical relation between throughput and bandwidth. We demonstrate the trade-off between information and power transfer efficiency for the proposed two-tone FSK modulation scheme. This is also confirmed by measurement results which shows data transfer at 7 Mbps in a more efficient power transfer operating region than demonstrated in the current state of the art.
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