RFmxLTE_ModAccFetchCompositeEVMArray
- Updated2025-04-08
- 2 minute(s) read
Returns an array of the composite EVM for ModAcc measurements.
Use "subblock<n>" as the selector string to read results from this function.
Syntax
int32 __stdcall RFmxLTE_ModAccFetchCompositeEVMArray(niRFmxInstrHandle instrumentHandle, char selectorString[], float64 timeout, float64 meanRMSCompositeEVM[], float64 maximumPeakCompositeEVM[], float64 meanFrequencyError[], int32 peakCompositeEVMSymbolIndex[], int32 peakCompositeEVMSubcarrierIndex[], int32 peakCompositeEVMSlotIndex[], int32 arraySize, int32 *actualArraySize)
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. |
| selectorString | [in] | char | This parameter specifies a Selector String comprising of the signal name, result name, and subblock number. If you do not specify the signal name, the default signal instance is used. If you do not specify the result name, the default result instance is used. The default value is "subblock0". |
| timeout | [in] | float64 | This parameter specifies the timeout for fetching the specified measurement. This value is expressed in seconds. Set this value to an appropriate time, longer than expected for fetching the measurement. A value of -1 specifies that the function waits until the measurement is complete. The default value is 10. |
| meanRMSCompositeEVM | [out] | float64 | This parameter returns the array of the mean value of the RMS EVMs calculated on all configured channels over the slots specified by the RFMXLTE_ATTR_MODACC_MEASUREMENT_LENGTH attribute. |
| maximumPeakCompositeEVM | [out] | float64 | This parameter returns the array of the maximum value of peak EVMs calculated on all configured channels over the slots specified by the ModAcc Meas Length attribute. |
| meanFrequencyError | [out] | float64 | This parameter returns the array of the estimated carrier frequency offset averaged over the slots specified by the ModAcc Meas Length attribute. |
| peakCompositeEVMSymbolIndex | [out] | int32 | This parameter returns the array of the symbol index where the ModAcc maximum peak composite EVM occurs. |
| peakCompositeEVMSubcarrierIndex | [out] | int32 | This parameter returns the array of the subcarrier index of the RFMXLTE_ATTR_MODACC_RESULTS_MAXIMUM_PEAK_COMPOSITE_EVM attribute. |
| peakCompositeEVMSlotIndex | [out] | int32 | This parameter returns the array of the slot index where the ModAcc maximum peak composite EVM occurs. |
| arraySize | [in] | int32 | Specifies the size of the array. Set the arraySize parameter to 0 to get the size of all the arrays in the actualArraySize parameter. |
| actualArraySize | [out] | int32 * | Returns the actual size of the array, if you pass NULL to all output array parameters, and set the arraySize parameter to 0. |
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 |