RFmxDemod_AnalyzeIQ1Waveform
- Updated2025-10-13
- 2 minute(s) read
Performs the enabled measurements on the I/Q complex waveform that you specify in IQ parameter. Call this function after you configure the signal and measurement attributes. You can fetch measurement results using the Fetch functions or result attributes in the attribute node. Use this function only if the RFMXINSTR_ATTR_RECOMMENDED_ACQUISITION_TYPE attribute value is IQ.
Syntax
int32 __stdcall RFmxDemod_AnalyzeIQ1Waveform(niRFmxInstrHandle instrumentHandle, char selectorString[], char resultName[], float64 x0, float64 dx, NIComplexSingle iq[], int32 arraySize, int32 reset, int64 reserved)
Remarks
Query the Recommended Acquisition Type attribute from the RFmxInstr Attribute after calling the RFmxDemod Commit function.
Parameters
| Name | Direction | Type | Description |
|---|---|---|---|
| instrumentHandle | [in] | niRFmxInstrHandle | This parameter specifies the RFmx session refnum. Instrument Handle In is obtained from the RFmxInstr_Initialize function or the RFmxInstr Initialize function with option string as "AnalysisOnly=1". |
| selectorString | [in] | char[] | This parameter specifies a Selector String comprising of the signal name and result name. The result name can either be specified through this input or the Result Name 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 input, either the result name specified by Result Name parameter or the default result instance is used. The default is "" (empty string). Example: "signal::sig1" "result::r1" "signal::sig1/result::r1" You can use the RFmxDemod_BuildSignalString function to build the selector string. |
| resultName | [in] | char[] | This parameter 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. The default value is "" (empty string) which refers to default result instance. Example: "result::r1" "r1" |
| x0 | [in] | float64 | This parameter specifies the start time of the input Y array. This value is expressed in seconds. |
| dx | [in] | float64 | This parameter 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. |
| iq | [in] | NIComplexSingle[] | This parameter specifies an array of complex-valued time domain data. The real and imaginary parts of this complex data array correspond to the in-phase (I) and quadrature-phase (Q) data, respectively. |
| arraySize | [in] | int32 | Specifies the size of the array. |
| reset | [in] | int32 | This parameter resets measurement averaging. If you enable averaging, set this parameter to TRUE for first record and FALSE for subsequent records. |
| reserved | [in] | int64 | Reserved for future use. Any value passed to this parameter will be ignored. |
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 RFmxDemod_GetError function.
The general meaning of the status code is as follows:
Value | Meaning |
|---|---|
0 | Success |
Positive Values | Warnings |
Negative Values | Errors |