Method, system and apparatus for calibrating a pulse position modulation (PPM) decoder to a PPM signal
US6687293B1 · kind B1 · utility
37Cited by
8References
11Claims
0Family size
Assignee
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Key dates
| Filing date | Jun 23, 2000 |
| Grant date | Feb 3, 2004 |
| Priority date | — |
| Expiry date | Jun 8, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/76
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A radio frequency identification (RFID) tag device having a pulse position modulation (PPM) decoder circuit which calculates a relative frequency relationship between an internal oscillator of the RFID tag device and an external PPM source such as a RFID tag reader. The PPM decoder circuit is calibrated to the difference between the external PPM frequency source (i.e., RFID tag reader) and the internal clock-oscillator of the RFID tag device, which is performed in a single measurement during one calibration symbol period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.