Abstract | ||
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A highly collision-resistive RFID system multiplexes communications between thousands of tags and a single reader in combination with time-domain multiplexing code division multiple access (TD-CDMA), CRC error detection, and re-transmission for error recovery. The collision probability due to a random selection of CDMA codes and TDMA channels bounds the number of IDs successfully transmitted to a reader during a limited time frame. However, theoretical analysis showed that the re-transmission greatly reduced the collision probability and that an ID error rate of 2.5 × 10-9 could be achieved when 1,000 ID tags responded within a time frame of 400 msec in ideal communication channels. The proposed collision-resistive communication scheme for a thousand multiplexed channels was modeled on a discrete-time digital expression and an FPGA-based emulator was built to evaluate a practical ID error rate under the presence of background noise in communication channels. To achieve simple anti-noise communication in a multiple-response RFID system, as well as unurged re-transmission of ID data, adjusting of correlator thresholds provides a significant improvement to the error rate. Thus, the proposed scheme does not require a reader to request ID transmission to erroneously responding tags. A reader also can lower noise influence by using correlator thresholds, since the scheme multiplexes IDs by CDMA-based communication. The effectiveness of the re-transmission was confirmed experimentally even in noisy channels, and the ID error rate derived from the emulation was 1.9 × 10-5. The emulation was useful for deriving an optimum set of RFID system parameters to be used in the design of mixed analog and digital integrated circuits for RFID communication. |
Year | DOI | Venue |
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2006 | 10.1093/ietfec/e89-a.2.408 | IEICE Transactions |
Keywords | Field | DocType |
highly collision-resistive rfid system,communication scheme,id transmission,rfid communication,id tag,crc error detection,correlator threshold,id error rate,collision probability,id data,communication channel,cdma-based communication,hardware emulation,inductive coupling,rfid,td cdma | Computer science,Word error rate,Communication channel,Error detection and correction,Real-time computing,Theoretical computer science,Emulation,Code division multiple access,Multiplexing,Time division multiple access,Computer hardware,Hardware emulation | Journal |
Volume | Issue | ISSN |
E89-A | 2 | 0916-8508 |
Citations | PageRank | References |
1 | 0.48 | 3 |
Authors | ||
4 |
Name | Order | Citations | PageRank |
---|---|---|---|
Yohei Fukumizu | 1 | 2 | 1.97 |
Shuji Ohno | 2 | 1 | 0.48 |
Makoto Nagata | 3 | 285 | 76.47 |
Kazuo Taki | 4 | 131 | 24.02 |