5.2 Power Receiver to Power Transmitter communications
interface
5.2.1 Introduction
The Power Receiver communicates to the Power Transmitter using backscatter modulation. For this
purpose, the Power Receiver modulates the amount of power that it draws from the Power Signal. The
Power Transmitter detects this as a modulation of the current through and/or voltage across the Primary
Cell. In other words, the Power Receiver and Power Transmitter use an amplitude modulated Power
Signal to provide a Power Receiver to Power Transmitter communications channel.
5.2.2 Physical and data link layers (PRx to PTx)
This section defines both the physical layer and the data link layer of the Power Receiver to Power
Transmitter communications interface.