xDSL modem having DMT symbol boundary detection
US6252902A · kind A · utility
14Cited by
16References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1999 |
| Grant date | Jun 26, 2001 |
| Priority date | — |
| Expiry date | Sep 13, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03522
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An xDSL communication system using Discrete Multi-tone (DMT) symbols sent over a channel. The magnitude of the channel's frequency-domain equalizing filter is normalized, leaving only phase information. The inverse discrete fourier transform of the normalized filter gives a peak at a position which corresponds to the group time delay of the transmitted DMT symbol. Identification of the symbol boundary facilitates synchronization of the receiver symbol sample phase to the transmitter symbol phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.