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This paper provides an analytical approach to evaluate the performance of anticollision protocols in radiofrequency identification (RFID) systems. The analysis is given at protocol-level using such performance metrics as the number of state transitions and clock cycles involved in the protocols' state diagrams, their power and energy dissipation. Discussion and comparison are based on worst-case scenario that represents the process of identifying the last tag when multiple tags are simultaneously available in the system. A new protocol is also proposed for performance improvement.