RFmxWLAN_OFDMModAccFetchPreambleAveragePowers80211Ac
- Updated2025-04-08
- 2 minute(s) read
Fetches the average power of the 802.11ac specific preamble fields.
Use "segment<n>/chain<k>" as the selector string to read results from this function.
Syntax
int32 __stdcall RFmxWLAN_OFDMModAccFetchPreambleAveragePowers80211Ac(niRFmxInstrHandle instrumentHandle, char selectorString[], float64 timeout, float64 *vhtsigaAveragePowerMean, float64 *vhtstfAveragePowerMean, float64 *vhtltfAveragePowerMean, float64 *vhtsigbAveragePowerMean)
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_InitializeFromNIRFSASessionArray function. |
| selectorString | [in] | char | This parameter specifies a Selector String comprising of the signal name, result name, segment number, and chain 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 "segment0/chain0". |
| timeout | [in] | float64 | This parameter specifies the timeout for fetching the specified measurement. 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. This value is expressed in seconds. The default value is 10. |
| vhtsigaAveragePowerMean | [out] | float64 * | This parameter returns the average power of the VHT-SIG-A field. When you set the RFMXWLAN_ATTR_OFDMMODACC_AVERAGING_ENABLED attribute to True, this parameter returns the mean of the VHT-SIG-A field average power results computed for each averaging count. This value is expressed in dBm. |
| vhtstfAveragePowerMean | [out] | float64 * | This parameter returns the average power of the VHT-STF field. When you set the OFDMModAcc Averaging Enabled attribute to True, this paramter returns the mean of the VHT-STF average power results computed for each averaging count. This value is expressed in dBm. |
| vhtltfAveragePowerMean | [out] | float64 * | This parameter returns the average power of the VHT-LTF field. When you set the OFDMModAcc Averaging Enabled attribute to True, this paramter returns the mean of the VHT-LTF average power results computed for each averaging count. This value is expressed in dBm. |
| vhtsigbAveragePowerMean | [out] | float64 * | This parameter returns the average power of the VHT-SIG-B field. When you set the OFDMModAcc Averaging Enabled attribute to True, this parameter returns the mean of the VHT-SIG-B field average power results computed for each averaging count. This value is expressed in dBm. |
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 RFmxWLAN_GetError function.
The general meaning of the status code is as follows:
Value | Meaning |
|---|---|
0 | Success |
Positive Values | Warnings |
Negative Values | Errors |