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Transportation Dissertation

Title Analysis of Interference between 5G Mobile Communications and Satellite Communications
Year 2022
Degree Master
School Department of Transportation and Communication Management Science, National Cheng Kung University
Author Wang, Po-Chun
Summary

       Advent of the fifth-generation mobile communication, the demand for spectrum resources is increasing. The interference between 5G mobile communications and satellite communications in the C-band is an issue that has been discussed around the world. In this study, an experimental platform for testing interference is implemented through software-defined radio technology. In this platform the RF equipment USRP is used to transmit and receive signals. This experiment takes DVB-S2 as the victim of radio communication. On the other hand, we have an interference source that complies with the 5G NR standard. While the interference signal is received, the DVB-S2 video file is demodulated at the same time. For co-channel interference, we set five different distances between the interference source and the victim. We also fix the center frequency of the interference source and adjust its eight different radiation power. The purpose is to test the effect of different distances and different radiation power of interference on DVB-S2 films. In the experiment, we use the 8PSK constellation diagram and the picture of the video to observe the degree of interference of the victim. We also use VLC media player to observe the DVB-S2 demodulated program video. Finally, the number of audio loss, video loss, and the number of discards are employed to determine the degree of interference of the program video. From the results, we can find that the stronger the signal strength of the interference source, the greater impact on the quality of the program video. And the farther the distance, the less the impact on the quality of the video. This research realized an experimental platform that can test interference by designing modules on GNU Radio, which not only saves a lot of costs, but also reflects the flexibility of SDR in its application.

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