Thresholds for the identification of wireless SAW RFID-tags with ASK

The generic identification (ID) error probability and optimum thresholds are found employing the Marcum Q-function of first order for passive wireless surface acoustic wave (SAW) ID-tags with binary amplitude shift keying (BASK). As examples, we find optimal thresholds for the 28-slot pulse-burst and the Barker code-based BASK. It is shown that, under the ideal conditions of equal SNRs of 30 dB in On-pulses and zeroth in Off-pulses, the identification error probability lesser 1% (one slip per 100 readings) can be provided employing ASK in time position encoding having any reasonable number of slots. The error lesser 0.1% (1 slip per 1000 readings) can be achieved with seven or lesser slots. Otherwise, ASK needs to be combined with other kinds of encoding.