Method and device for assessing the quality of service on transmission channels in a digital transmission system
US6629286B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 2000 |
| Grant date | Sep 30, 2003 |
| Priority date | — |
| Expiry date | Feb 22, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/0059
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A quality of service on transmission channels in a digital transmission system is assessed. A turbo coding is carried out in a turbo coder at the transmitter end for channel coding. A turbo decoding is carried out in a turbo decoder with soft-decision output signals at the receiver end. The quality of service is determined from the variances of the soft-decision output signals from the turbo decoder. If a MAP (maximum a posteriori) symbol estimator is used at the receiver end, the quality of service is determined from the variance &sgr;2LLR of the log-likelihood ratio LLR of the soft-decision output signals from the turbo decoder. The variances &sgr;2LLR are used to calculate the bit error rate as a measure of the quality of service. An RCPTC (Rate Compatible Punctured Turbo Code) is used as the turbo code for the method and in the device for assessing the quality of service.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.