Pipelined decision feedback decoder
US5097486A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1990 |
| Grant date | Mar 17, 1992 |
| Priority date | — |
| Expiry date | Jul 31, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/063
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The decision feedback decoder of the invention receives sequentially sampled values of a signal waveform corresponding to data bits transmitted by a channel. A magnitude comparator compares the sampled values to a threshold and based on each comparison it provides subsequent decisions determining the values of the corresponding data bits. A predetermined number of previous decisions are stored and applied to a first and a second threshold adjustment circuit. Each circuit adjusts the threshold depending on the respective values of the previous decisions, while the first circuit provides the adjustment based on an assumption that the next decision to be made will have a first signal value and the second circuit provides the adjustment based on an assumption that the next decision will have a second signal value. When that next decision becomes available, it is utilized to select the correct adjusted threshold value for the next comparison by the magnitude comparator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.