Frame alignment and time domain equalization for communications systems using multicarrier modulation
US6456654B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1998 |
| Grant date | Sep 24, 2002 |
| Priority date | — |
| Expiry date | Dec 22, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/0377
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A discrete multitone (DMT) receiver has a time domain equalizer (TDEQ) which is trained during initialization using an estimated channel impulse response (CIR). To eliminate wrap-around of the estimated CIR relative to the DMT frame alignment, and to remove leading zeroes, the estimated CIR is circularly advanced relative to the frame alignment for training the TDEQ. In subsequent communications of DMT symbols via the channel and the TDEQ, the equalized samples of the received DMT symbols are buffered to compensate, in a frame alignment of the received DMT symbols, for the advance of the estimated CIR in the initialization process and for a delay in the TDEQ.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.