RFID readers mitigating colored noise
US8325014B1 · kind B1 · utility
24Cited by
3References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 28, 2009 |
| Grant date | Dec 4, 2012 |
| Priority date | — |
| Expiry date | Dec 26, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06Q40/03
- WIPO fieldIT methods for management
- WIPO sectorElectrical engineering
Abstract
An RFID reader uses an adaptive filter to mitigate the effects of colored noise in tag reply signals. The adaptive filter may be a linear equalizer, a linear-predictive canceller, or a decision-feedback equalizer. The adaptive filter estimates the colored noise portion of the signal received from the tag and removes the noise estimate from the tag signal. The adaptive filter bases its noise estimate on the difference between a desired signal and a portion of the received signal. The reader uses reader-generated training data, a CW signal, and/or portions of the tag reply signal to adapt the filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.