Telecommunications – Transmitter and receiver at separate stations – Short range rf communication
Reexamination Certificate
2011-05-31
2011-05-31
Jackson, Blane J (Department: 2618)
Telecommunications
Transmitter and receiver at separate stations
Short range rf communication
C455S323000, C455S258000, C340S010200
Reexamination Certificate
active
07953370
ABSTRACT:
An RFID transceiver device is proposed capable of carrier sensing even when the difference with respect to the carrier frequency employed by the other system is close to “0”. The device includes a control and signal processing circuit; a local oscillation circuit that generates a local oscillation signal of frequency that is specified by said control and signal processing circuit; and a reception circuit that demodulates the reception signal using the local oscillation signal frequency that is output from said local oscillation circuit; wherein the control and signal processing circuit performs control so as to output, to the local oscillation circuit, a local oscillation signal of a reference frequency in the case of ordinary communication, and output, to the local oscillation circuit, a local oscillation signal shifted by a prescribed frequency with respect to said reference frequency in the case of carrier sensing, as a local oscillation signal for demodulating the reception signal in the reception circuit.
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Ninomiya Teruhisa
Tanaka Yoshinori
Fujitsu Limited
Fujitsu Patent Center
Jackson Blane J
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