RFmxTDSCDMA SlotPower Configure Measurement Length VI

Selector String specifies a selector string comprising of the signal name. If you do not specify the signal name, the default signal instance is used. The default value is "" (empty string).

Examples:

""

"signal::sig1"

You can use the RFmxTDSCDMA Build Signal String VI to build the selector string.

Instrument Handle In specifies the RFmx session refnum. Instrument Handle In is obtained from the RFmxInstr Initialize NIRFSA VI.

Measurement Length specifies the measurement length for the SlotPower measurement. This value is expressed in slots. The SlotPower measurement assumes that there is only one active traffic time slot per subframe, and that the position of this active time slot is the same in each subframe. Additionally, it assumes that there are no pilots present in the received signal.

NI recommends you set a measurement length as a multiple of the number of slots per subframe, that is a multiple of 7. For example, when you set this property to 28 slots, the SlotPower measurement would report results for the 4 active time slots within the specified measurement length. In this example, 28 slots = 4 subframes.

The start of the measurement is determined by the Trigger Type property. Although all the values of the Trigger Type property are supported for this measurement, it is recommended to set the Trigger Type property to Digital Edge with the following options:

• Digital trigger at the start of active slot, with the Trigger Delay property set to 0 seconds
• Digital trigger at the start of the subframe, with the Trigger Delay property configured to a value which is equal to the time offset of the active time slot from the start of the subframe

The table shows the values of the Trigger Delay property, when you specify the following active slots values:

Active Slot	Trigger Delay (microseconds)
TS0	0
TS1	950
TS2	1625
TS3	2300
TS4	2975
TS5	3650
TS6	4325

If you cannot provide a digital trigger, you can set Trigger Type property to IQ Power Edge to ensure that the measurement starts at the start of an active time slot. To ensure this trigger works properly, NI recommends you complete the following steps:

• Set the IQ Power Edge Level property to allow triggering for any of the power levels in the active slots
• Run the RFmx measurement just before generating your signal

If you set the Trigger type property to None, the measurement will automatically detect the start of the first burst and measure the traffic slot in that position in every subframe.

You do not need to use a selector string to configure or read this property for the default signal instance. Refer to the Selector Strings topic for information about the string syntax for named signals.

The default value is 28. The minimum value is 1.

error in describes error conditions that occur before this node runs. This input provides standard error in functionality.

Instrument Handle Out passes a reference to your RFmx session to the next VI.

error out returns error information. This output provides standard error out functionality.