SWIPT with biased ASK modulation and dual-purpose hardware

With the emergence of IoT it becomes important to make extremely small batteryless devices that contain both circuitry for data and power reception. While simultaneous transmission of data and power, making optimal use of the scarce wireless spectrum, has been proposed before, it is also possible to consider dual-purpose hardware to decode data and harvest power from the simultaneous wireless information and power transfer (SWIPT) waveform. In this paper we study the trade-off between power and data reception for an integrated receiver. It is shown that the hardware can behave as a rectifier or envelope detector, depending on the excitation's symbol rate and the rectifier's low pass filter's cut-off frequency.