Implementación de un sistema de transmisión simultánea de señales digitales en banda base y pasante utilizando USRP 2920
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 Modulati...
| Autor Principal: | Moreno Villaroel, Edison Eduardo |
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| Formato: | bachelorThesis |
| Idioma: | spa |
| Publicado: |
2017
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| Materias: | |
| Acceso en línea: |
http://dspace.ups.edu.ec/handle/123456789/14046 |
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| Sumario: |
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). The multiplexing of the signals was done through a T-type connector and was transmitted to the receiver by means of an SMA (Sub Miniature version A) cable; Allowing to treat the multiplexed signal by 2 different channels.
In the first channel was connected the second USRP, which has an internal bandpass filter that eliminated the signal in baseband, through the software Labview developed a programming that allowed to demodulate the QPSK signal, retrieving the first source of information. In the second channel a low pass filter was connected, which eliminated the bandpass signal, recovering the PAM5 signal, thus visualizing and saving the data obtained by the Oscilloscope Real Time Oscilloscope (RTO), to decode the signal Off-line mode.
Through gain variations in the modulated signal and the signal-to-noise ratio between the individual and the simultaneous signal, the most stable signal was determined using the Bit Error Rate (BER) |
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