Time correction and distance measurement in wireless mesh networks
US8325704B1 · kind B1 · utility
43Cited by
1References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 18, 2008 |
| Grant date | Dec 4, 2012 |
| Priority date | — |
| Expiry date | Mar 2, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W92/12
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Correcting a time of reception of a data packet is disclosed. A radio-frequency input is converted to a data-output signal. A data clock is recovered from the data-output signal. A phase offset is measured between the data-output signal and the data clock. A time of reception is corrected based at least in part on a timestamp. The timestamp is a sampled value of a counter at a time of reception of a data packet and the phase offset. The time correction can be used to calculate a distance estimate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.