Anti-collision backscatter sensor networks

Aggelos Bletsas, Stavroula Siachalou, John N. Sahalos

Research output: Contribution to journalArticlepeer-review


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

Original languageEnglish
Article number5288938
Pages (from-to)5018-5029
Number of pages12
JournalIEEE Transactions on Wireless Communications
Issue number10
Publication statusPublished - Oct 2009


  • Collision
  • Outage probability
  • RFID
  • Wireless networks


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