5. Carrier Frequency Offset Estimation and Correction using PSS in 5G Networks
Time: 90 min (video: 15 min + Chapter: 45 min + Code: 30 min)
The air interface of 5G NR is based on orthogonal frequency division multiplexing (OFDM), which divides the wideband carrier into small orthogonal subcarriers. Unlike the wideband signal, these subcarriers experience flat fading, resulting in significantly reduced receiver complexity and improved spectral efficiency. However, OFDM is very sensitive to time and frequency synchronization errors. These errors can arise in the frequency or time domains due to carrier frequency offset (CFO) and symbol time offset (STO), respectively. This experiment will focus on the carrier frequency offset and its impact on the system, as well as algorithms to estimate and correct the CFO using the synchronization signal block (SSB).