Apparatus and method for demodulating subcarrier tag signal in RFID reader
AssigneeElectronics and Telecommunications Research Institute
InventorsJi-Hoon Bae, Donghan Lee, Won Kyu Choi, Cheng-Hao Quan, Gil Young Choi, Jong-Suk Chae
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Abstract
An apparatus and a method for demodulating a subcarrier tag signal in a radio frequency identification (RFID) reader is provided. The apparatus for demodulating the subcarrier tag signal in the RFID reader may include: an edge signal generation unit receiving a subcarrier tag signal and generating an edge signal with respect to the tag signal; an edge information extraction unit extracting edge information from the generated edge signal; and a decoding unit decoding the tag signal using the extracted edge information.
Claims10
An apparatus for demodulating a subcarrier tag signal in a radio frequency identification (RFID) reader, the apparatus comprising:
- an edge signal generation unit receiving the subcarrier tag signal and generating an edge signal with respect to the tag signal;
- an edge information extraction unit extracting edge information from the generated edge signal;
- and
- a decoding unit decoding the tag signal using the extracted edge information,
- wherein the edge information extraction unit calculates an upper difference value and a lower difference value by comparing a present sample value of the edge signal with at least one previous sample value of the edge signal and detects a peak point of the edge signal using the upper difference value and the lower difference value, and the edge information is extracted using the detected peak point.
A method for demodulating a subcarrier tag signal in an RFID reader, the method comprising:
- receiving the subcarrier tag signal and generating an edge signal with respect to the tag signal;
- extracting edge information based on the generated edge signal;
- and
- decoding the tag signal using the extracted edge information,
- wherein the extracting edge information includes:
- calculating an upper difference value and a lower difference value by comparing a present sample value of the edge signal with at least one previous sample value of the edge signal;
- detecting a peak point of the edge signal using the upper difference value and the lower difference value;
- and
- extracting the edge information using the detected peak point.
Dependencies are inferred from the claim text.