Configures the position of the FFT window that is used to calculate the EVM.

Syntax

int32 __stdcall RFmxLTE_ModAccCfgFFTWindowOffset(niRFmxInstrHandle instrumentHandle, char selectorString[], float64 fftWindowOffset)

Parameters

NameDirectionTypeDescription
instrumentHandle[in]niRFmxInstrHandle

This parameter specifies the RFmx session refnum. Instrument Handle In is obtained from the RFmxInstr_Initialize function.

selectorString[in]char

This parameter 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 is "" (empty string).
Example:
"signal::sig1"
You can use the RFmxLTE_BuildSignalString function to build the selector string.

fftWindowOffset[in]float64

This parameter specifies the position of the FFT window that is used to calculate the EVM. The offset is expressed as a percentage of the cyclic prefix length. If you set this parameter to 0, the EVM window starts from the end of cyclic prefix. If you set this parameter to 100, the EVM window starts from the beginning of cyclic prefix. The default value is 50. Valid values are 0 to 100, inclusive.

Returns

Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxLTE_GetError function.

The general meaning of the status code is as follows:

Value

Meaning

0

Success

Positive Values

Warnings

Negative Values

Errors