Scaling Wireless Power Transfer Through Code Division Multiple Access

Scalability has been a persistent barrier to the intersection of wireless power transfer (WPT) with the Internet of Things (IoT). These densely connected networks of electronic devices require the ability to exchange power as freely as they can exchange information. Existing approaches for multiple access often require cumbersome additional circuitry, complex feedback techniques, or dedicated slots in time, frequency, or space. These methods suffer from drawbacks and limit the scalability of WPT. This paper examines how code division multiple access (CDMA) enables scalability in wireless power transfer. A framework for CDMA for WPT is presented along with a simple yet effective coding scheme and a transceiver design.