Single frequency operation readers

Single-frequency operation readers operate in one frequency zone, either in LF, HF, or UHF. Such readers become inconvenient if tags in a warehouse are operating in different frequencies. 

RFID readers can be classified using two different schemes. First, the readers can be classified based on their location as handheld readers and fixed readers. Second, the tags can be classified based upon the frequency in which they operate—single frequency and multi-fiequenr. ... 

Frequency domain resampling is attractive in the present context because the timescaling and the resampling operations can be performed in a single phase-vocoder analysis, thus reducing the computational cost. The interested reader may consult [Moulines and Laroche, 1995] for a complete description of the algorithm. 

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