Device and method for achieving rotational invariance in a multi-level trellis coding system
US5535228A · kind A · utility
38Cited by
11References
50Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 22, 1995 |
| Grant date | Jul 9, 1996 |
| Priority date | — |
| Expiry date | Aug 22, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/3438
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A device (100) and method (400) are set forth that provide a parity check that utilizes a nonlinear dependence upon bits other than the parity bit alone. The 4D 16-state Wei trellis code is made transparent to m.multidot.90 degree rotations by utilizing a parity generating unit that generates a parity check bit based on at least a second rotationally significant label bit. The parity check bit allows detection of errors in a first rotationally-significant label bit, i.e., allows for achievement of a rotationally transparent parity check.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.