  We aims to provide an interpretation of the the design background,
motivation, and key innovations of FreeRider. The technique utilized by
FreeRider enables tags to transform codewords present in commodity signals into
another valid ones from the same codebook during reflection. As a result, the
backscattered signal remains valid as commodity radios such as ZigBee or
Bluetooth. By using commodity radios, FreeRider's backscatter system addresses
the issue of specialized hardware requirements, thereby expanding its potential
applications across various fields such as smart homes, healthcare, and
industrial environments.
