Wireless communication apparatus
First Claim
1. A wireless communication apparatus comprising:
- an ASK modulator for ASK-modulating a carrier wave using a data signal; and
a QPSK modulator for QPSK-modulating a carrier wave using an I-signal and a Q-signal;
wherein an output terminal of said QPSK modulator is connected to a carrier wave input terminal of said ASK modulator.
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Accused Products
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 (5D) of a QPSK modulator (5) is connected to a carrier wave input terminal (1A) of an ASK modulator (1) via a switch (15). Also, an antenna (4) is connected to an output terminal (1C) of the ASK modulator (1) via a switch (16). Furthermore, a mixer (13) is provided between the switches (15) and (16). The switch (15) connects the QPSK modulator (5) and the ASK modulator (1) at the time of a transmission, whereas it connects the QPSK modulator (5) and the mixer (13) at the time of a reception. The switch (16) connects the ASK modulator (1) and the antenna (4) at the time of a transmission, whereas it connects the antenna (4) and the mixer (13) 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 (1) and the QPSK modulator (5). At the time of a reception, a sine wave is output by the QPSK modulator (5) and a data signal is down-converted, detected, or demodulated by the mixer (13).
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Citations
10 Claims
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1. A wireless communication apparatus comprising:
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an ASK modulator for ASK-modulating a carrier wave using a data signal; and
a QPSK modulator for QPSK-modulating a carrier wave using an I-signal and a Q-signal;
wherein an output terminal of said QPSK modulator is connected to a carrier wave input terminal of said ASK modulator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification