Methods and apparatus for decoding data
US6487258B1 · kind B1 · utility
80Cited by
4References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1998 |
| Grant date | Nov 26, 2002 |
| Priority date | — |
| Expiry date | Dec 16, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2602
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In a coded orthogonal frequency division multiplex (COFDM) system n-bit data words are encoded as 2m-symbol code words, each symbol having 2j possible values (e.g. j=3 for octary). An efficient decoder for these code words is provided by applying j iterations of the fast Hadamard transform, the input vector for the second and subsequent iterations being derived from the result of the immediately preceding iteration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.