System for simultaneously identifying massive rfid tags using hf band

A high-frequency (HF) reader comprising:

• an analog circuit unit to receive a tag signal and to transmit a reader command in an analog form via amplitude-shift keying (ASK) modulation;
• an analog-to-digital converter (ADC) to receive the modulated tag signal and to convert the tag signal into a digital signal;
• and
• a digital circuit unit to receive the digital tag signal and to generate the reader command,
• wherein the digital circuit unit adjusts a plurality of transmission output levels to conduct simultaneous identification of massive RFID tags.

An operation method of a tag in a system for simultaneously identifying massive radio-frequency identification (RFID) tags using a high-frequency (HF) band, the operation method comprising:

• receiving a carrier wave from a reader and waiting in a ready mode;
• transitioning to an arbitrate mode and selecting one of a plurality of slots set by the reader when a BeginRound command is received in the ready mode;
• and
• transitioning to a reply mode simultaneously with transmitting a stored Cyclic Redundancy Checking (CRC) packet using the selected slot.

An operation method of a reader in a system for simultaneously identifying massive radio-frequency identification (RFID) tags using a high-frequency (HF) band, the operation method comprising:

• amplitude-shift keying (ASK) demodulating a received tag signal;
• converting an analog signal into a digital signal for digital demodulation of the tag signal;
• demodulating a subcarrier of the tag signal converted into the digital signal;
• and
• decoding the demodulated tag signal to extract information,
• wherein massive tag identification performance is improved by the ASK demodulating into the analog signal and the demodulating of the subcarrier into the digital signal.