- In the present project, a digital transmission system was implemented by means of frequency multiplexing using Software Defined Radio (USRP 2920, Universal Software Radio Peripherical) controlled by the Labview program, which allowed to generate a source of digital information, a Quaternary Modulation (QPSK, Quadriphase Shift Keing), this signal was coupled in a carrier signal that raised it in frequency, obtaining a passband signal, the same that was multiplexed to a Pulse Amplitude Modulated signal of 5 Levels (PAM5, Press Amplitude modulation), it was conserved in its baseband and sent by means of an arbitrary generator of signals (AWG, Generator Waves Arbitrary).
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