Design of high order modulation backscatter wireless sensor for passive IoT solutions

Fully passive wireless networks are an enable for the internet of things. One of the hypothesis for this passive network implementation is to use backscatter radio nodes. Nevertheless, the traditional approach is to use ASK or PSK backscatter solutions that limits the data rate of the sensors, since it transfers only one bit per symbol period. In order to overcome these limitation, in this paper we propose a novel passive wireless sensor network based in 4-QAM backscatter modulation. The design strategy for high level order backscatter modulations will be explained and a design approach will be presented in this manuscript.