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Wireless powered backscatter communications is an attractive technology fornext-generation low-powered sensor networks such as the Internet of Things.However, backscattering suffers from collisions due to multiple simultaneoustransmissions and a dyadic backscatter channel, which greatly attenuate thereceived signal at the reader. This letter deals with backscattercommunications in sensor networks from a large-scale point-of-view andconsiders various collision resolution techniques: directional antennas,ultra-narrow band transmissions and successive interference cancellation. Wederive analytical expressions for the decoding probability and our results showthe significant gains, which can be achieved from the aforementionedtechniques.

Backscatter Communications for Wireless Powered Sensor Networks with Collision Resolution