Radio communication system, radio communication device, and radio communication method
US7796016B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 28, 2005 |
| Grant date | Sep 14, 2010 |
| Priority date | — |
| Expiry date | Jul 15, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L5/143
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A radio communication system performs data communication by a backscatter system using absorption and reflection of a received radio wave. In the system, a data reading device transmits an unmodulated carrier of frequency fO; a data transmitting device subjects transmission data to primary modulation using a center frequency fS to obtain a primary modulated signal, and subjects the primary modulated signal to secondary modulation by multiplying the primary modulated signal by an input of the unmodulated carrier of the backscatter system to generate a reflected modulated wave in which one of frequencies fO+fS and fO−fS is suppressed; and the data reading device receives the reflected modulated wave from the data transmitting device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.