Analog and Digital Demodulation Process Examples Using GNU Radio

摘要

At present, the Argentine students of Communication System introductory courses do not have any practical knowledge on communication because many of these students did not study in technical high schools. We have to cope with this situation. Lab works would be the solution; however, equipment is not always available or at least it is difficult to implement. This paper describes lab work procedures to explain some common modulated analog signals such as AM, SSB, Broadcasting FM, and elemental digital signals such as OOK and BPSK using GNU Radio as workspace. These lab works are being implemented in Communication System introductory courses in the Electronics Department of Universidad Tecnológica Nacional, Facultad Regional Buenos Aires, with excellent results. These practices are inexpensive because no instruments are required; all that is necessary is an adequate computer running GNU Radio, an open-source software which can be run anywhere.