Transient Period (5G NR/5G-Advanced)

The Transient Period (uplink only) parameter group is used to decide when the transient period starts and ends and whether the transient period is excluded from EVM calculation. See TS 38.521-1, Section 6.4.2.1a.3 and TS 38.521-1 Annex, Section 4.7 for more information on EVM test including symbols with transient period.

Mode - For each slot, the VSA software detects symbols with transient periods and excludes the transient periods from the EVM calculation based on the Mode selection. Proper exclusion depends on properly setting the transient period Length and Power Change Threshold.

None - Use all symbols for EVM calculation without excluding transient period.

Exclude Symbols - Exclude symbols with transient period.

Exclude Transient Period - Include symbols with transient period, but exclude transient by EVM WINDOW (CP-OFDM, used for conformance testing) or TIME (DFT-s-OFDM). See Transform Precoding for more information.

Default: None

Length - Sets the expected length (tp) and location (tp_start)of the transient period, for the purpose of detecting and excluding the transient period from EVM calculations. tp_start denotes the start position of the exclusion window relative to the beginning of the symbol, as shown in Figure E.4.7-1 of TS 38.521-1 Annex 4.7. See TS 38.521-1 Table 6.4.2.1a.3-1 and Annex 4.7 for more information.

2 µs - Configures the VSA for a 2 µs reported transient period (tp = 2 µs, tp_start = -0.5 µs)

4 µs - Configures the VSA for a 4 µs reported transient period (tp = 4 µs, tp_start = -1 µs)

7 µs - Configures the VSA for a 7 µs reported transient period (tp = 7 µs, tp_start = -2.7 µs)

Default: 2 µs

Power Change Threshold - Sets the threshold for detecting whether the power is changed from last slot to next slot.