A new anti-collision method for SAW tags using linear block codes

In this paper a new separation/anti-collision method for simultaneous interrogation of multiple surface acoustic wave identification (SAW-ID) tags is presented. The tags are encoded by means of a linear block code . This approach allows to retrieve lost data caused by destructive superposition of the response signals of multiple tags. Another advantage of this principle is that the IDs of the tags result directly without scanning all possible combinations of tags. A typical application is multi-object tagging in an industrial environment.