Detection and Division for Backscatter Signals

Summary

In machine‐type communications, there might be power‐limited or battery‐free devices (namely parasite devices) which can use backscatter communications to transmit their data by harvesting and reflecting the energy of radio frequency sources (namely host devices). The ambient backscatter communication system (ABCS) uses the already‐available radio frequency sources for backscatter communications, it can reduce costs and improve spectrum efficiency as no dedicated energy supply is deployed in the system. However, the unpredictability and dynamics of the ambient signal make it a direct interference to the receiver, enabling the detection of signals to play a pivotal role in the ABCS. In this chapter, we introduce an approach to detect the presence of parasite devices and separate parasite signals from host signals.