Analysis of Adjacent Channel Interference between Terrestrial and Non-Terrestrial 5G Networks Over 28 GHz Millimeter-wave Band

This letter assesses the interference between terrestrial 5G network (TN-5G) and non-terrestrial 5G network (NTN-5G) operating in millimeter wave Ka-band. Specifically, the impact that NTN-5G causes on TN-5G system in the 28 GHz band is analyzed. Simulations using Monte-Carlo method are performed to obtain the interference power in the victim system, for different guard bands. Also, experiments using laboratory equipment are performed to analyze the BLER and Throughput of the user equipment (UE) under different interference power levels. The results showed that interference from NTN-5G may impact the TN-5G, depending on the adopted guard band. Ideally, guard bands above 100 and 180 MHz are recommended for TN-5G operating with 50 and 100 MHz bandwidths, respectively. On the other hand, experiments showed that UE performance can be severely degraded by interference power above -108 dBm. Finally, it is concluded that TN-5G and NTN-5G can coexist since the appropriate guard bands are considered, depending mainly on the bandwidth of the victim system.