Low SNR Mode (5G NR/5G-Advanced)

Low SNR Signal-to-Noise Ratio Mode triggers specific synchronization algorithm and demodulation processing for use when the input signal is very noisy (e.g., receiver sensitivity tests, where the signal to noise power ratio can be around 0dB).

You can also use Low SNR Mode for troubleshooting when EVM Error vector magnitude (EVM): A quality metric in digital communication systems. See the EVM metric in the Error Summary Table topic in each demodulator for more information on how EVM is calculated for that modulation format. is unexpectedly high and the PDSCH/PUSCH RB Number is small (e.g., 2 or 3).

The Low SNR Mode synchronization and demodulation process is different from the normal measurement. This parameter is not coupled with any other parameters, but when the signal is very noisy, any tracking or channel estimation based on data is not accurate. To get the best performance of low SNR receiver test, set these parameters as follows:

Turn off 3GPP Conformance Test
Turn off all tracking (Time/Phase/Amplitude)
Change the EQ Signal Source to RS
Change the EQ Time Basis to Per Frame
Change the Symbol Time Adjustment Mode to EVM Window Center
Turn off Compensate Symbol Clock Offset

Default: Disabled

Choices: Enabled, Disabled