Quadrature phase shift keying (QPSK) and binary phase shift keying (BPSK) modulators are used to change the amplitude, frequency, and/or phase of a carrier signal in order to transmit information.
In the mobile radio, since the multipath fading distorts the amplitude of the carrier, the signal is sent by modulating the phase or frequency of the carrier, which has no impact on the amplitude. We ...
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