WO2005101305A9 - Adaptable bandwidth rfid tags - Google Patents
Adaptable bandwidth rfid tagsInfo
- Publication number
- WO2005101305A9 WO2005101305A9 PCT/US2005/012490 US2005012490W WO2005101305A9 WO 2005101305 A9 WO2005101305 A9 WO 2005101305A9 US 2005012490 W US2005012490 W US 2005012490W WO 2005101305 A9 WO2005101305 A9 WO 2005101305A9
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- setting
- decoded
- data rate
- tag
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
Definitions
- FIG. 7A is a block diagram showing a third circuit for implementing the choice of FIG. 4.
- FIG. 9E is an intensity-frequency diagram showing the power spectral densities of signals emerging from a filter(s) block of FIG. 3 in response to the signals of FIG. 9B, in the event that a third filter bandwidth choice is implemented.
- FIGURES 2A, 2B, 2C depict respectively sample waveforms 212-A, 212-B, 212-C of interrogating RF signal 112 of FIGURE 1, at three different data rates.
- Sample waveforms 212-A, 212-B, 212-C are those of a preamble, which starts with four symbols for zero, then a prespecified symbol called a "violation", and then followed by another zero symbol, hi all cases, the first low pulse has the same duration, of at least
- the selector switch transitions to a new setting if the decoded signal matches the preset code. For example, with reference to FIGURES 2A, 2B, 2C, if at time Tl it is determined that the first low pulse of a preamble has been received in any of three frequencies, then the setting could skip by default to the one with the highest bandwidth, and from there back track to lower bandwidths in an attempt to match the reader, hi some embodiments, the tag could initially start at a setting with the lowest bandwidth, transition to the highest, and then end up backtracking again to the lowest bandwidth.
- FIGURE 4 is a conceptual state diagram 400 for illustrating reception bandwidth choices according to the invention.
- Diagram 400 operates by analogizing from electrical concepts.
- Decoder 760-B also includes interpreter 766-A, similar to what was described for group 720- A above.
- Interpreter 766-A outputs decoded signal DS from digital signal MS. In other embodiments, three interpreters are provided, and the output of one is chosen, and so on.
- FIGURE 8 is flowchart 800 illustrating a method according to an embodiment of the invention. The method of flowchart 800 may be practiced by different embodiments of the invention, including but not limited to RFID tag 120, an RFID tag that includes component groups 320, 520, 620, 720- A, and 720-B.
- the signal is decoded subject to the current reception bandwidth setting. This may take place after the signal has been filtered. As per the above, decoding may take place only once, from a signal filtered and/or selected according to the current reception bandwidth setting. Alternately, decoding may be performed on a number of filtered signals, and then selecting one of them may be performed according to the current reception bandwidth setting, before or after interpreting.
- the decision may be made by comparing the decoded signal with a preset code, such as code 768 in FIGURES 7 A and 7B.
- code 768 is at least a portion of a preamble. Then, determining whether to transition or not to the second setting depends on the comparison.
- the active data rate of the transmission may be determined in a number of ways.
- the active data rate is determined by determining a bit period between successively received symbols of the decoded signal
- the decoded signal is a preamble that has a preassociated data rate
- the active data rate is determined from the preassociated data rate.
- the decoded first signal is a DATA RATE command, which is followed by an associated data rate instruction.
- a DATA RATE command may be agreed upon by convention.
- the active data rate is determined from the instruction.
- next block 870 there is transitioning to the next decided setting. Transitioning may be accomplished in a number of ways, such as by adjusting a bandwidth of a filter, or by changing a path of the received signal.
- the signal path may include a first filter, and switching may route the following signal through a second filter, and so on.
- Execution then returns to block 820. Then another signal or portion of a signal is received, and processed at the new setting, as per the above.
- FIGURE 9C is an intensity-frequency diagram showing the power spectral densities of signals emerging from a filter(s) block of FIGURE 3 in response to the signals of FIGURE 9B.
- a first filter bandwidth choice 951 is implemented. It will be noted that filtered signal FSl includes the desired component FSO, but also difference beat frequency SDl and the signal around it. It will be further noted that all other signals have been rejected.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007508492A JP2007533269A (en) | 2004-04-13 | 2005-04-12 | Adaptable frequency bandwidth RFID tag |
EP05735366A EP1745417A1 (en) | 2004-04-13 | 2005-04-12 | Adaptable bandwidth rfid tags |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/823,991 US7183926B2 (en) | 2004-04-13 | 2004-04-13 | Adaptable bandwidth RFID tags |
US10/823,991 | 2004-04-13 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2005101305A1 WO2005101305A1 (en) | 2005-10-27 |
WO2005101305A9 true WO2005101305A9 (en) | 2006-12-07 |
Family
ID=34965815
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2005/012490 WO2005101305A1 (en) | 2004-04-13 | 2005-04-12 | Adaptable bandwidth rfid tags |
Country Status (4)
Country | Link |
---|---|
US (1) | US7183926B2 (en) |
EP (1) | EP1745417A1 (en) |
JP (1) | JP2007533269A (en) |
WO (1) | WO2005101305A1 (en) |
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-
2004
- 2004-04-13 US US10/823,991 patent/US7183926B2/en active Active
-
2005
- 2005-04-12 EP EP05735366A patent/EP1745417A1/en not_active Withdrawn
- 2005-04-12 WO PCT/US2005/012490 patent/WO2005101305A1/en not_active Application Discontinuation
- 2005-04-12 JP JP2007508492A patent/JP2007533269A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
EP1745417A1 (en) | 2007-01-24 |
US7183926B2 (en) | 2007-02-27 |
US20050225435A1 (en) | 2005-10-13 |
JP2007533269A (en) | 2007-11-15 |
WO2005101305A1 (en) | 2005-10-27 |
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