NIBTSA_RESULT_LE_INBAND_EMISSION_MEASUREMENT_START_CHANNEL
- Updated2023-02-21
- 1 minute(s) read
| Data Type: | int32 |
| Access: | read only |
| Functions: | niBTSA_GetScalarAttributeI32 |
| Description: | Returns the start channel used for the LEInBandEmission measurement. The toolkit computes the start channel based on the device under test (DUT) transmit channel number and the value of the NIBTSA_LE_INBAND_EMISSION_NUMBER_OF_CHANNELS attribute. The measurements are made using 1 MHz spacing, and the DUT transmit channels have a 2 MHz spacing. If you set the NIBTSA_LE_INBAND_EMISSION_OFFSET_CHANNEL_POSITION attribute to NIBTSA_VAL_OFFSET_CHANNELS_POSITION_INBAND, the toolkit measures the number of channels around the DUT transmit channel number * 2, and it limits the channel power measurements within the Bluetooth LE band. The measurement start channel is limited to -1 to 79, inclusive. If you set the NIBTSA_LE_INBAND_EMISSION_OFFSET_CHANNEL_POSITION attribute to NIBTSA_VAL_OFFSET_CHANNELS_POSITION_CENTERED, measurement start channel is calculated using the following formula: (returned value of NIBTSA_LE_INBAND_EMISSION_NUMBER_OF_CHANNELS attribute-1)/2. For example, if the DUT transmit channel number is 3, and the number of channels is 7, the toolkit measures the spectrum for 8 channels around channel number 6, which is the DUT transmit channel number * 2. The measurement start channel, which is biased to the left, is 2. The toolkit computes the channel powers channel numbers 2 to 9, inclusive. As another example, if the DUT transmit channel number is 3 and the number of channels is 15, the toolkit measures the spectrum for 16 channels around channel number 6, which is the DUT transmit channel number * 2. The measurement start channel is limited to -1, and the toolkit computes the channel powers for the channel numbers -1 to 14, inclusive. Get Function: niBTSA_LEInbandEmissionGetMeasurementStartChannel |