Wireless communication apparatus

Details Wireless communication apparatus Wireless communication apparatus

2006-10-10

2006-10-10

Ha, Dac (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Angle modulation

C375S302000, C375S300000, C375S322000, C375S320000, C455S017000, C455S023000, C455S102000, C455S108000, C455S110000

Reexamination Certificate

active

07120202

ABSTRACT:
In a wireless communication apparatus which has the functions of both ASK modulation and QPSK modulation, which can be manufactured at a low cost, and which is small in size, an output terminal of a QPSK modulator is connected to a carrier wave input terminal of an ASK modulator via a switch. Also, an antenna is connected to an output terminal of the ASK modulator via a switch. Furthermore, a mixer is provided between the switches and. The switch connects the QPSK modulator and the ASK modulator at the time of a transmission, whereas it connects the QPSK modulator and the mixer at the time of a reception. The switch connects the ASK modulator and the antenna at the time of a transmission, whereas it connects the antenna and the mixer at the time of a reception. Thus, at the time of a transmission, an ASK-modulated wave or a QPSK-modulated wave is output using the ASK modulator and the QPSK modulator. At the time of a reception, a sine wave is output by the QPSK modulator and a data signal is down-converted, detected, or demodulated by the mixer.

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Japanese office action issued Nov. 25, 2003 (w/ English translation of relevant portion).
International Search Report mailed Mar. 5, 2003.

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