Synchronization apparatus for accurately demodulating signal input to PJM tag and PJM tag including the synchronization apparatus
US8325868B2 · kind B2 · utility
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16Claims
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Key dates
| Filing date | Oct 29, 2009 |
| Grant date | Dec 4, 2012 |
| Priority date | — |
| Expiry date | Mar 26, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/0723
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A passive phase jitter modulation (PJM) tag is charged with power in a continuous wave (CW) section. When receiving a command from a reader, the passive PJM tag must recognize the command and determine exactly when to begin demodulating the command. Only then can the passive PJM tag demodulate the command. To this end, a synchronization apparatus for accurately demodulating a signal input to a PJM tag includes a plurality of correlators correlating a received phase jitter-modulated signal with a template of an internal matched filter which is in the same form as at least a portion of a modified frequency modulation (MFM) flag.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.