Why does 5G NR require phase tracking reference signals (PTRS)? The video explains the concept of PTRS and how they are used to compensate for the typical phase error (CPE) - caused by the impact of phase noise at higher frequencies (mmWave, FR2). It also demonstrates phase noise emulation using the R&S SMW200A vector signal generator and how this function can be used to test correction algorithms to compensate for CPE in a receiver such as a mobile handset. The demystifying 5G video series discusses main topics related to 5G including new technology components, procedures and testing challenges. More: https://www.rohde-schwarz.com/5G