In-phase and quadrature decision feedback equalizer
US7339989B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 5, 2004 |
| Grant date | Mar 4, 2008 |
| Priority date | — |
| Expiry date | Mar 4, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/067
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An apparatus and method are provided for equalizing a dispersive channel based on in-phase and quadrature samples corresponding to an input signal. An equalizer according to the present invention uses a novel adaptation algorithm to adjust filtering characteristics based on previous in-phase samples and a current quadrature sample. The adaptation algorithm is configured to update filter coefficients in response to detecting a transition in the in-phase samples. The equalizer provides equalization for quadrature post-cursor intersymbol interference (ISI) components of the input signal. In an embodiment, the equalizer also provides equalization for in-phase post-cursor ISI components, quadrature precursor ISI components, in-phase precursor ISI components, or a combination of the forgoing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.