Bit detection method in a radio communications system
US6519740B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 1998 |
| Grant date | Feb 11, 2003 |
| Priority date | — |
| Expiry date | May 15, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/007
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The present invention relates generally to the detection of bits which are protected by repetition, and which, along with their repetitions, have associated soft values available which give a measurement of the reliability of their received values. In particular, the present invention may be used in speech encoding in the GSM mobile communications system, and more particularly to the detection of those class 2 bits called pulse5 bits which are not protected with channel coding. In enhanced full rate (EFS) transmission in GSM there are 4 bits called pulse5 bits. These pulse5 bits are duplicated twice, giving three bits for each original bit, for a total of twelve pulse5 bits. These bits have associated soft values, a probability measure of their reliability, that are produced by the equalizer. These associated soft values are then used in the present invention to improve detection of these pulse5 bits over the state of the art which detects the pulses bits only using a majority decision among the 3 bits generated, without using their associated soft values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.