RFID Anti-Collision System Using the Spread Spectrum Technique
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The abbreviation RFID stands for “Radio Frequency Identification”, and is a technology that is vastly and rapidly advancing. An RFID system creates a situation where any product can be labeled with essentially any information, and the owner can access this information at any time without having direct contact with the item. The immediate and most prominent goal of RFID is to allow the owner of the system to keep track of his inventory without manually having to handle each individual item. There are also numerous other applications that can be extended for these systems. Essentially, any pertinent information about an item can be stored on the item itself, making automation and control incredibly simple, fast, and noninvasive. The possibilities are endless. The goal of this project was to design and fabricate a fully functional RFID system from scratch. The system was designed to sense and identify 255 mutually exclusive items. The tag was designed to encode a variable identity and transmit this information. On the receiver end, an algorithm was developed in Matlab to process, detect, and decrypt the incoming information to recover the identity of the chip it is currently sensing.