Collaborative Backscatter Based on Phase Channel Estimation in Passive RF Tag Networks

The RF tags offer ultra-low power cost of the communication due to the passive receiver based on envelope detector. The tag-to-tag link requires presence of excitation signal, either as a dedicated continuous wave exciter or an ambient RF signal. However, the link suffers from the limited range. The capability of RF tags to passively estimate the amplitude and phase of the wireless channel between...