5G Millimeter wave (mmWave) bands can offer much larger available spectrum bandwidth and thus are considered as one of the most promising approaches to significantly boost the capacity in 5G NR. However, devices and network radio nodes operating on mmWave bands suffer from phase noise and without correction of phase noise, the performance of the network could potentially suffer significant losses. In this video, we briefly touch upon
the effects of phase noise and how those can be combated by using phase tracking reference signals (PT-RS), as currently standardized in 3GPP. This also describes the design of PTRS and explained the occurrence of PTRS in symbols and subcarriers.
00:00 - Introduction
00:22 - Phase Noise
02:32 - What is impacted by Phase Noise
05:45 - Phase Tracking Reference Signal (PTRS)
08:45 - PTRS in CP-OFDM
09:12 - PTRS in DFT-s-OFDM
11:15 - Time Density of PTRS
15:33 - Frequency Density of PTRS
18:36 - Example to calculate the number of PTRS REs in 1 Slot
19:40 - Demonstration of PTRS elements in Resource Grid

References:
1. 3GPP 38.211
2. TDoc R1-1612338
3. Y. Qi, M. Hunukumbure, H. Nam, H. Yoo and S. Amuru, "On the Phase Tracking Reference Signal (PT-RS) Design for 5G New Radio (NR)," 2018 IEEE 88th Vehicular Technology Conference (VTC-Fall), 2018, pp. 1-5, doi: 10.1109/VTCFall.2018.8690852.

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