Title:
無線通信システム、無線通信装置及び無線通信方法
Document Type and Number:
Japanese Patent JP4020096
Kind Code:
B2
Abstract:
Disclosed is a radio communication system for performing data communication by a backscatter system using absorption and reflection of a received radio wave, wherein a data reading device transmits an unmodulated carrier of frequency f O ; a data transmitting device subjects transmission data to primary modulation with a center frequency f S , and subjects a signal resulting from the primary modulation (12) to secondary modulation (13) by multiplying the signal resulting from the primary modulation by an input of the unmodulated carrier of the backscatter system so as to generate a reflected modulated wave in which one of frequencies f O + f S and f O - f S is suppressed; and the data reading device receives a reflected wave signal in which one of the frequencies f O + f S and f O - f S is suppressed from the data transmitting device.
Inventors:
Kunio Fukuda
Application Number:
JP2004140580A
Publication Date:
December 12, 2007
Filing Date:
May 11, 2004
Export Citation:
Assignee:
ソニー株式会社
International Classes:
H04B1/59; G01S13/75; G06K7/00; G06K17/00; G06K19/07; G08C17/02; H03D1/00; H04B1/00; H04B5/02; H04L5/14; H04L27/00
Domestic Patent References:
| JP63279621A | ||||
| JP10209914A | ||||
| JP63121773A |
Attorney, Agent or Firm:
Masaaki Miyata
Eiji Yamada
Toshio Sawada
Eiji Yamada
Toshio Sawada