Transmission security for wireless communications
US6438367B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 9, 2000 |
| Grant date | Aug 20, 2002 |
| Priority date | — |
| Expiry date | Feb 7, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L63/0428
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method of transmission level security, and a corresponding transmission security system, the method consists of the steps of: forming a plurality of digital signals representing a symbol to be transmitted over a communication medium, wherein respective ones of the plurality of digital signals are modulated onto respective ones of a plurality of subcarriers according to a multiple carrier modulation scheme; and introducing a group delay distortion in one or more of the plurality of subcarriers, wherein a peak-to-peak variation of the group delay distortion is greater than a guard time interval corresponding to the symbol, such that portions of the one or more of the plurality of subcarriers will be received outside of a time window corresponding to the symbol at a receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.