Signal Space Representation of Chipless RFID Tag Frequency Signatures

A novel approach to decode information in a chipless RFID tag using signal space representation (SSR) is presented. SSR represents 2^b possible tag signatures of a b-bit tag as linear combinations of a small set of $L$ orthonormal basis functions. Each signature encoding a binary bit sequence is represented by a point in an $L$-dimensional constellation. Prototype 3-bit chipless RFID tags are used to validate the detection technique. The proposed method gives a solid mathematical framework to develop detection and decoding methods for more complicated tag reading scenarios.

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