Blind equalizer method and apparatus for HDTY transmission using an NTSC rejection filter for mitigating co-channel interference
US5841484A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 1997 |
| Grant date | Nov 24, 1998 |
| Priority date | — |
| Expiry date | Jul 2, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S348/914
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A blind-equalization method and apparatus are disclosed for equalization of a channel of an HDTV receiver. The HDTV receiver comprises a rejection filter corresponding to a precoder for which precoding is implemented at a television transmitter for combating co-channel interference, wherein the television transmitter transmits a digital television signal. The HDTV receiver further comprises an equalizer having an input and an output. The equalization method comprises the steps of initiating an equalization with a blind slicing mode. The method further comprises changing the equalization to a training sequence mode upon an occurrence of a no flutter condition. While in the training sequence mode, if a flutter condition occurs, then the equalization is returned to the blind slicing mode. A determination of the occurrence of the flutter condition is based upon an estimate of a negative derivative of the Signal-to-Noise Ratio (SNR) at the output of the equalizer, dS.sub.o, being greater than a prescribed threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.