Soft decision decoder
US5920599A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 10, 1997 |
| Grant date | Jul 6, 1999 |
| Priority date | — |
| Expiry date | Feb 10, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/03318
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A soft decision decoder including an adaptive equalizer and a reliability information generator. The reliability information generator, receiving soft decision data and equalized square error from the adaptive filter, performs delay detection of the soft decision data, and then rotates the phase of the delay detected data so as to match the data to transmitted data components. The rotated data is weighted with the average value of the equalized square error to generate the reliability information for the soft decision Viterbi decoding. This makes it possible to obviate the exponential or logarithm calculations which are conventionally needed for generating the reliability information for carrying out the soft decision Viterbi decoding of the output of the adaptive equalizer, and hence to reduce the enormous amount of calculations and the size of hardware like DSP for performing the calculations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.