Dual decision feedback equalizer with selective attenuation to improve channel performance
US6307884A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 1998 |
| Grant date | Oct 23, 2001 |
| Priority date | — |
| Expiry date | May 29, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03566
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for improving error rate performance in a communication channel utilizes a dual decision feedback equalizer (DDFE) through the application of selective attenuation. An improved DDFE comprises first and second decision feedback equalizers (DFEs) operably connected in parallel to receive a series of input signals z.sub.k. The DFEs independently generate two series of decisions â ;.sup.1.sub.k and â ;.sup.2.sub.k in relation to peak magnitudes of the series of transmitted signals z.sub.k by filtering the series of decisions â ;.sup.1.sub.k and â ;.sup.2.sub.k to generate filtered outputs (a*p).sup.1.sub.k and (a*p).sup.2.sub.k based on previous decisions, and summing the filtered outputs (a*p).sup.1.sub.k and (a*p).sup.2.sub.k with the transmitted input series z.sub.k to generate two series of decision variables a.sup.1.sub.k and a.sup.2.sub.k, to remove effects of intersymbol interference. The improved DDFE further comprises first and second attenuation blocks, so that when a mismatch is detected between the series of decisions â ;.sup.1.sub.k and â ;.sup.2.sub.k, a selective attenuation gain less than one is introduced into each …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.