RFID readers mitigating colored noise
US8390430B1 · kind B1 · utility
20Cited by
0References
8Claims
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Key dates
| Filing date | Aug 10, 2012 |
| Grant date | Mar 5, 2013 |
| Priority date | — |
| Expiry date | Aug 10, 2032 |
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.