Method and system for securely communicating information using multiple RF carriers
US7747274B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 2007 |
| Grant date | Jun 29, 2010 |
| Priority date | — |
| Expiry date | Oct 17, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B5/77
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Amplitude modulation of multiple carriers provides a pulse width modulated train resulting in a novel and effective communication mechanism to overcome difficulties in certain RF applications, particularly in the area of Radio Frequency Identification (RFID). A novel conceptual pulse is formed and developed using a set of RF frequencies, such as ultra wideband frequencies, amplitude modulated to form a pulse width modulated binary coded signal. The concept is to wirelessly convey information only to a receiver at a specified distance or range. The RF energy may continue on in space, but receivers of the same design would only receive information from a transmitter if the receivers are located at a specified distance. Equivalent receivers at all other distances would see noise.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.