Adaptive equalizer for
US5517527A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 11, 1992 |
| Grant date | May 14, 1996 |
| Priority date | — |
| Expiry date | Dec 11, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/03057
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention comprises an adaptive equalizer to be implemented in a receiver to cancel the ISIs. Basically, it has a decision feedback equalizer structure including a feedforward filter and a feedback filter. The receiver further includes a gain controller to properly adjust the amplitude of the equalized signals to reduce the non-equalization bias. It also has a detector to determine the symbol value of +3 +1, -1, and -3 and for generating the error signal to update the coefficients of the equalizer via the adaptive algorithm. The adverse effect of error propagation is reduced by strengthening the function of the feedforward filter. The equalizer training period is also shorten as the gain controller provides additional information for the detector to eliminate the signal bias caused by the non-optimal coefficients of the equalizer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.