Methods and devices for sending and receiving information, and systems using them
US7190730B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 16, 2001 |
| Grant date | Mar 13, 2007 |
| Priority date | — |
| Expiry date | Sep 11, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/0054
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An original information sequence is encoded by a use of an error correcting code. There is associated with the encoded sequence K frequency symbols in a space consisting of a series of 2p increasing frequencies, each of the K symbols representing N encoded symbols, with p, K and N being strictly positive integers. There is applied to the K symbols a reversible transformation including a multiplication by an invertible matrix of size N×N, and signals obtained from the inverse transform signals are sent. There exists a K-tuplet of positive integers n1, n2, . . . , nk at least one of which is strictly positive, such that, for an integer I varying from 1 to K, after periodic extraction of one frequency out of 2ni among the frequencies of the ith of the K symbols, thus forming a reduced frequency symbol of 2p−ni frequencies, K reduced frequency symbols are obtained, representing the original information sequence, with a view to complete or partial decoding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.