Capacity analysis of an ultrawideband active RFID system

A novel pulsed ultra-wideband active RFID system is introduced. One of the primary questions of such a system is estimation of the optimum number of tags that can be detected by the receiver. To solve this problem, we define a vulnerable time and transmission rate for each tag. We show for a large number of tags, the number of tags read for the first time in a time period can be estimated by the total number of tags in that time period. The number of tags is modeled as interarrival times for a renewal process. The total scanning time which is a multiple of time period is the renewal process. Since finding distribution function for the unique tags read in each time period is very complicated, applying renewal process results and formulas can be very helpful and useful to have a correct perception of the system in general. Finally, experimental results are provided using experimental hardware.