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QPSK MODULATOR AND ASK MODULATOR TRANSMISSION DEVICE
QPSK MODULATOR AND ASK MODULATOR TRANSMISSION DEVICE
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机译:QPSK调制器和ASK调制器传输装置
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摘要
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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