Method and system for accurately converging a timing recovery mechanism and an equalizer at a receiver
US8644416B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 5, 2013 |
| Grant date | Feb 4, 2014 |
| Priority date | — |
| Expiry date | Sep 5, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03503
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A transmitter transmits to a receiver a training sequence having symbols belonging to a single modulation scheme. At least 90% of symbols have low symbol amplitude, and at most 10% of the symbols have high symbol amplitude. A first symbol estimator estimates the symbols using substantially only the sign of the received symbols, and substantially disregarding symbol amplitudes. A timing recovery mechanism estimates the received symbols in order to continuously reduce a frequency drift between the receiver and the transmitter. The first symbol estimator is switched off and a second symbol estimator is switched on according to a certain criterion. The second symbol estimator estimates symbols belonging to the training sequence. Each of the symbols is estimated to either the low symbol amplitude or the high symbol amplitude. An equalizer uses the symbols estimated by the second symbol estimator to converge, achieve signal equalization, and eliminate inter-symbol interference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.