ABSTRACT
The course of Principles of Communications involves a wide range of know ledge and is both theoretical and practical. It is difficult for beginners to closely link theory with practice. Therefore, it is necessary to consolidate theoretical teaching results through experiments. The traditional experimental teaching of Principles of Communications is to let students go to the laboratory and carry out experiments by programming on software radio hardware. However, during the COVID-19 pandemic period, students are unable to conduct experiments in the laboratory, so online experiments become the only feasible scheme. This paper introduces an online experiment scheme, compares the online scheme with lab experiments. The online experiment system has been used in one class of 28 students and the positive rate of the system from the students is 86%.