Low complexity frequency domain echo canceller for DMT transceivers
US6377683B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 1998 |
| Grant date | Apr 23, 2002 |
| Priority date | — |
| Expiry date | May 29, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03414
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A low-complexity frequency domain echo canceller for use in a full-duplex DMT transceiver. The transceiver includes a modulator that utilizes DMT modulation methods for communication over the transmission medium, a demodulator for receiving DMT signals, and a frequency domain echo canceller for removing echoes of the transmitter's signal from the receive signal. The echo canceller models the echo channel characteristic as an FIR filter that distorts the transmitted signal that is received by the receiver section of the full-duplex transceiver. The echo is removed from the received signal by determining the frequency domain characteristic of the echo channel. A local replica of the echo is generated in the frequency domain using the echo characteristic and is subtracted from the frequency domain representation of the received signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.