Signal decoding method and apparatus with dynamic noise threshold
US7609784B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 12, 2007 |
| Grant date | Oct 27, 2009 |
| Priority date | — |
| Expiry date | Feb 12, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2203/5466
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for use by a receiver in decoding information sent by phase-shift keying over a carrier frequency for use with power line carrier (PLC) applications as it is adapted to appropriately position the sampling window based on a zero crossing of one of the phases of the power line. The method allows for receipt and processing of information on more than one carrier frequency and from transmitters operating on a phase of the power line that is different than the phase used by alternating current at the power grid frequency on the receiver to detect the zero crossings of the power line. Optionally, a threshold parameter may be dynamically adjusted in reaction to the underlying level of noise so as to reduce the number of bursts carrying actual data that are discarded as having only noise. A number of alternative embodiments are included.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.