RFID and Block Diagram Questions, help!!!

Questions are shown on the pictures.



For the block diagram, I know

(1) error signal

(5) output

(7) feedback signal



What are the (2), (3), (4) and (6)?







Besides, how to answer the RFID questions?

Ans. 1. For example, mall card?

Ans. 2.

Ans. 3.

Ans. 4.

Ans. 5.

Please help!!!

Attached Images

	Block diagram.PNG (47.3 KB)
	RFID.png (17.6 KB)