NI-RFmx GSM 2.5 Help

Edition Date: June 2018

Part Number: 375416F-01

»View Product Info
Download Help (Windows Only)

int32 __stdcall RFmxGSM_AnalyzeIQSplit (niRFmxInstrHandle instrumentHandle, char selectorString[], char resultName[], float64 x0, float64 dx, float32 I[], float32 Q[], int32 arraySize, int32 reset, int32* averagingDone);


Performs the enabled measurements on the I/Q complex waveform that you specify in I and Q parameters. Call this function after you configure the signal and measurement attributes. You can fetch measurement results using the Fetch functions. Use this function only if the RFMXINSTR_ATTR_RECOMMENDED_ACQUISITION_TYPE attribute value is RFMXINSTR_VAL_RECOMMENDED_ACQUISITION_TYPE_IQ.

Note  Query the RFMXINSTR_ATTR_RECOMMENDED_ACQUISITION_TYPE attribute after calling the RFmxGSM_Commit function.


Name Type Description
instrumentHandle niRFmxInstrHandle Specifies the instrument session. The RFmx driver obtains this parameter from the RFmxGSM_Initialize function.
selectorString char[] Specifies a selector string comprising of the signal name and result name. The result name can either be specified through this input or the resultName parameter. If you do not specify the signal name, the default signal instance is used. If you do not specify the result name in this parameter, either the result name specified by the resultName parameter or the default result instance is used.
You can use the RFmxGSM_BuildSignalString function to build the selector string.
resultName char[] Specifies the name to be associated with measurement results. Provide a unique name, such as "r1" to enable fetching of multiple measurement results and traces. This input accepts the result name with or without the "result::" prefix.

x0 float64 Specifies the start time of the input Y array. This value is expressed in seconds.
dx float64 Specifies the time interval between the samples in the input Y array. This value is expressed in seconds. The reciprocal of dx indicates the I/Q rate of the input signal.
I float32[] Specifies the real part of an array of complex-valued time domain data. The real part of this complex data array correspond to the in-phase (I) data.
Q float32[] Specifies the imaginary part of an array of complex-valued time domain data. The imaginary parts of this complex data array correspond to the quadrature-phase (Q) data.
arraySize int32 Specifies the size of the array.
reset int32 Resets measurement averaging. If you enable averaging, set this parameter to TRUE for first record and FALSE for subsequent records.
Name Type Description
averagingDone int32* Indicates whether averaging on all the enabled measurements is complete.

Return Value

Name Type Description
status int32 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 RFmxGSM_GetError function.

The general meaning of the status code is as follows:

Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors


Not Helpful