RFID tag device, tag identification device and radio communication system
First Claim
1. An RFID tag device, comprising:
- a random number generator which generates a random number or a pseudo-random number;
an identification information holding unit which holds identification information having a plurality of bits;
a noise addition processing unit which generates noise-added identification information by conducting either of reversal from “
0”
of a bit decided based on the random number generated by the random number generator to “
1”
or reversal from “
1”
of the bit to “
0”
, among a plurality of bits included in the identification information; and
a radio communication unit which transmits the noise-added identification information by radio.
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Accused Products
Abstract
An RFID tag device has a random number generator which generates a random number or a pseudo-random number, an identification information holding unit which holds identification information having a plurality of bits, a noise addition processing unit which generates noise-added identification information by conducting either of reversal from “0” of a bit decided based on the random number generated by the random number generator to “1” or reversal from “1” of the bit to “0”, among a plurality of bits included in the identification information, and a radio communication unit which transmits the noise-added identification information by radio.
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Citations
18 Claims
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1. An RFID tag device, comprising:
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a random number generator which generates a random number or a pseudo-random number;
an identification information holding unit which holds identification information having a plurality of bits;
a noise addition processing unit which generates noise-added identification information by conducting either of reversal from “
0”
of a bit decided based on the random number generated by the random number generator to “
1”
or reversal from “
1”
of the bit to “
0”
, among a plurality of bits included in the identification information; and
a radio communication unit which transmits the noise-added identification information by radio. - View Dependent Claims (2, 3, 4)
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5. An RFID tag device, comprising:
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a filter holding unit which holds a filter having a plurality of bits capable of probabilistically detecting whether or not a certain bit string is included in a group of bit strings;
a random number generator which generates a random number or a pseudo-random number;
a noise addition processing unit which generates a noise-added filter obtained by either of reversal from “
0”
of a bit decided based on the random number generated by the random number generator or reversal from “
1”
of a bit decided based on the random number generated by the random number generator among a plurality of bits included in the filter; and
a radio communication unit which transmits the noise-added filter by radio. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. A tag identification device, comprising:
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a tag information storage unit which stores identification information of a known radio tag device;
a radio communication unit which receives noise-added identification information or a noise-added filter having a plurality of bits with a noise bit, transmitted from a certain RFID tag device;
a bit comparison unit which compares a bit having a certain bit value among a plurality of bits included in the received noise-added identification information or the received noise-added filter with corresponding bit of the identification information stored in the tag information storage unit, based on a ratio of bit “
0”
to bit “
1”
included in the plurality of bits; and
a determination unit which determines whether or not the identification information corresponding to the noise-added identification or the noise-added filter received by the radio communication unit is stored in the tag information storage unit based on a result compared by the bit comparison unit. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification