System and method for decoding tail-biting code especially applicable to digital cellular base stations and mobile units
US5369671A · kind A · utility
26Cited by
1References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 20, 1992 |
| Grant date | Nov 29, 1994 |
| Priority date | — |
| Expiry date | May 20, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M13/23
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A digital cellular system (10) employs a decoder that decodes control messages encoded by a convolutional tail-biting encoding procedure. The control messages (57) contain 65 bits that are encoded in a 260 bit data frame (59). The decoder reads (112) the first x quadruple bits and writes them also at the end of the data frame bit stream. A Viterbi decoding algorithm (114) is applied to the modified bit stream for x plus 65 steps. A bit stream of (65+x) bits is selected (116) from a best value path and y first bits are discarded from the selected stream. The output decoded message (118) includes bits (y+1) through (y+65).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.