Method and apparatus for computing prefilter coefficients
US6608862B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 1999 |
| Grant date | Aug 19, 2003 |
| Priority date | — |
| Expiry date | Aug 20, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/03235
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The impulse response of a prefilter used with a DFSE equalizer in a receiver system is computed. A channel estimate is determined in response to signals received by the receiver system. The channel estimate may include a forward channel estimate and a backward channel estimate. Roots of a z-transform of the forward channel estimate and roots of a z-transform of the backward channel estimate are determined. Those roots of the z-transform of the forward channel estimate having a magnitude greater than one are used to form a z-transform of a forward impulse response of the prefilter while those roots of the z-transform of the backward channel estimate having a magnitude greater than one are used to form a z-transform of a backward impulse response of the prefilter. Forward prefilter coefficients for the prefilter are computed based on the z-transform of the forward impulse response of the prefilter and backward prefilter coefficients for the prefilter are computed based on the z-transform of the backward impulse response of the prefilter. A forward impulse response of a forward composite channel are computed based on the forward prefilter coefficients while a backward impulse response…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.