Specifies the FFT window length (W). This value is expressed as a percentage of the cyclic prefix length. This property is used when you set the ModAcc FFT Window Type property to 3GPP, where it is needed to calculate the EVM using two different FFT window positions, Delta_C-W/2, and Delta_C+W/2. Refer to the Annexe E.3.2 of 3GPP 36.521 specification for more information.

Refer to the LTE Modulation Accuracy (ModAcc) topic for more information about FFT Window Length.

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 as given in the 3GPP specification. The default value is 91.7 %CP for 10M bandwidth. Valid values range from -1 to 100, inclusive.

When this property is set to -1, RFmx populates the FFT Window Length based on carrier bandwidth automatically, as given in the Annexe E.5.1 of 3GPP 36.104 specification.

Remarks

The following table lists the characteristics of this property.

Short Name ModAcc FFT Window Length (%CP)
Data type cdbl.png
Permissions Read/Write
High-level VIs RFmxLTE ModAcc Configure FFT Window Position
Resettable Yes