RFID system and communication method thereof
First Claim
Patent Images
1. An RFID system comprising:
- an RFID tag; and
a reader device communicating with the RFID tag,wherein the RFID tag includes;
N load-modulators and N antennas communicating with the reader device in any one scheme of M-pulse amplitude modulation (M-PAM) and M-quadrature amplitude modulation (M-QAM) in which modulation of an M level is performed and operated corresponding to the M level;
a code generating unit adding a parity to data stored in the RFID tag to generate an error correcting code; and
a preamble signal generating unit generating a preamble code having auto-correlation characteristics of a delta function,wherein N load-modulators and N antennas transmit the error correcting code and the preamble code to the reader device in any on scheme of M-pulse amplitude modulation (M-PAM) and M-quadrature amplitude modulation (M-QAM) in which modulation of the M level is performed and operated corresponding to the M level.
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Abstract
An RFID system using an M pulse amplitude modulation (M-PAM) or M quadrature amplitude modulation (M-QAM) scheme using a plurality of load-modulators, a plurality of antennas, and a communication method thereof are provided. The RFID system includes: an RFID tag; and a reader device communicating with the RFID device, wherein the RFID tag includes: N load-modulators an N antennas communicating with the reader device in any one scheme of M-pulse amplitude modulation (M-PAM) and M-quadrature amplitude modulation (M-QAM) in which modulation of an M level is performed and operated corresponding to the M level.
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Citations
17 Claims
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1. An RFID system comprising:
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an RFID tag; and a reader device communicating with the RFID tag, wherein the RFID tag includes; N load-modulators and N antennas communicating with the reader device in any one scheme of M-pulse amplitude modulation (M-PAM) and M-quadrature amplitude modulation (M-QAM) in which modulation of an M level is performed and operated corresponding to the M level; a code generating unit adding a parity to data stored in the RFID tag to generate an error correcting code; and a preamble signal generating unit generating a preamble code having auto-correlation characteristics of a delta function, wherein N load-modulators and N antennas transmit the error correcting code and the preamble code to the reader device in any on scheme of M-pulse amplitude modulation (M-PAM) and M-quadrature amplitude modulation (M-QAM) in which modulation of the M level is performed and operated corresponding to the M level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A communication method of an RFID system including an RFID tag and a reader device communicating with the RFID tag, the communication method comprising:
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adding, in the RFID tag including a load-modulator, a parity to data stored in the RFID tag to generate an error correcting code; generating, in the RFID tag, a preamble code having auto-correlation characteristics of a delta function; transmitting, in the RFID tag, the error correcting code and the preamble code to the reader device using N load-modulators corresponding to an M level in any one scheme of M-pulse amplitude modulation (M-PAM) and M-quadrature amplitude modulation (M-QAM) in which modulation of the M level is performed; and receiving, in the reader device, the error correcting code and the preamble code transmitted to detect the preamble code and decode the error correcting code. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification