Anti-collision backscatter sensor networks

摘要: Sensor collision (interference) is studied in a large network of low bit-rate sensors that communicate via backscatter, i.e. modulate the reflection common carrier transmitted by central reader. Closed-form analysis provided, quantifying sensor high-density, backscatter networks (BSN), as function number tags and aggregate bandwidth. Analysis applicable to broad class subcarrier modulations, propagation environments reader antenna directivity patterns. It discovered anti-collision performance high-density feasible provided appropriate modulation used at each sensor. That due round-trip nature communication well extended target range, which both impose stringent requirements on spectrum efficiency, not easily met all modulations. Furthermore, bandwidth savings for given are quantified, when simple division techniques (modulating) frequency space (via moderately directive hub antenna) combined.