Calculating apparatus and method for use in a maximum likelihood detector and/or decoder
US7822138B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 2004 |
| Grant date | Oct 26, 2010 |
| Priority date | — |
| Expiry date | Mar 28, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M13/4138
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A calculator for use in a maximum likelihood detector, including: a receiver for receiving convolution encoded data which may include noise; first calculator for calculating a first component of a first path metric difference between two possible sequences of states corresponding to the convolution encoded data, the two sequences each having a length equal to a constraint length of the convolution encoded data, and the two sequences starting at a same state and ending at a same state, adapted to calculate the first component using the convolution-encoded data and using convolution encoding parameters of the convolution-encoded data, wherein the first component is independent of the two sequences; and second calculator for calculating a second component of the first path metric difference using the two sequences, wherein the second component is independent of the convolution encoded data; and using the first and second components to obtain the first path metric difference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.