With the release of 5G, society is becoming increasingly connected. The growing number of electronic devices emitting electromagnetic signals increases the risk of unintentional interference to wireless communication systems. As 5G New Radio (NR) grows beyond its commercial role to also support mission-critical services such as public safety and military communications, it places high demands on its reliability under interference. A key component in the 5G NR downlink is the Demodulation Reference Signal (DM-RS) of the Physical Broadcast Channel (PBCH), which enables accurate channel estimation and decoding. Disruption of this signal can severely degrade PBCH performance and jeopardize overall communication reliability.

This thesis investigates the robustness of 5G in the presence of different interference signals affecting the PBCH DM-RS. The study focuses on two interference types: additive white Gaussian noise (AWGN) and continuous wave (CW) signals. System performance is primarily evaluated through the bit error rate (BER) of PBCH, reflecting the overall channel performance under these conditions.

The analysis shows that CW interference generally degrades the PBCH DM-RS more than AWGN, particularly at higher E_b/N_I values. Additionally, a CW signal applied between subcarriers causes the interference to spread across multiple subcarriers, further reducing performance. Accurate estimation of key parameters via DM-RS is crucial, since errors can prevent proper PBCH operation regardless of interference conditions.