Timing control in orthogonal frequency division multiplex systems based on effective signal-to-noise ratio
US7564775B2 · kind B2 · utility
33Cited by
3References
35Claims
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Key dates
| Filing date | Apr 29, 2005 |
| Grant date | Jul 21, 2009 |
| Priority date | — |
| Expiry date | Dec 18, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2001/0093
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A spread-spectrum communication system provides an effective signal-to-noise ratio (SNR) of received orthogonal frequency division multiplex (OFDM) slots in the presence of timing errors. Effective SNR can serve as a diagnostic tool for determining whether there was a timing error when a measured packet error rate (PER) remains high, and a predicted PER from the effective SNR remains low. A loop can use the effective SNR to control a time reference used by an OFDM decoder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.