Nonlinear echo compensator
US6563870B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 22, 2000 |
| Grant date | May 13, 2003 |
| Priority date | — |
| Expiry date | Oct 23, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/23
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A nonlinear echo compensator for an L-level message signal includes a plurality of groups of coefficient memories, wherein each group is assigned to at least one tupel of N successive symbols of the message signal. A selection circuit is connected to a transmit channel in order to receive an outgoing message signal. The selection circuit uses a value, which is currently received, and N−1 preceding symbols of the message signal to select the group associated with the tupel formed by these symbols. A superposition circuit superposes the coefficients of the group, successively and according to a symbol clock, onto a message signal arriving on a receive channel. The echo compensator is particularly suitable for use in a data transmission system in which the symbol pulse duration of the message signal is limited to N*T, where T is the symbol period of the message signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.