NIWLANA_RESULT_OFDM_DEMOD_IQ_GAIN_IMBALANCE_AVERAGE
- Updated2023-02-21
- 1 minute(s) read
| Data Type: | float64 |
| Access: | read only |
| Functions: | niWLANA_GetScalarAttributeF64 |
| Description: | Returns the average, across iterations, of the I/Q gain imbalance estimates. I/Q gain imbalance is the ratio of the mean amplitude of the in-phase (I) signal to the mean amplitude of the quadrature-phase (Q) signal. This value is expressed in dB. If you set the NIWLANA_STANDARD attribute to NIWLANA_VAL_STANDARD_80211AG_OFDM, NIWLANA_VAL_STANDARD_80211J_OFDM, NIWLANA_VAL_STANDARD_80211P_OFDM or NIWLANA_VAL_STANDARD_80211G_DSSS_OFDM, you must use an empty string as the active channel string format to query this attribute. If you set the NIWLANA_STANDARD attribute to NIWLANA_VAL_STANDARD_80211N_MIMO_OFDM or NIWLANA_VAL_STANDARD_80211AH_MIMO_OFDM, you must use 'channelx' as the active channel string format to query this attribute. If you set the NIWLANA_STANDARD attribute to NIWLANA_VAL_STANDARD_80211AC_MIMO_OFDM, NIWLANA_VAL_STANDARD_80211AF_MIMO_OFDM or NIWLANA_VAL_STANDARD_80211AX_MIMO_OFDM, you must use '[segmentx/]channely' as the active channel string format to query this attribute. 'segment0/' is optional if the NIWLANA_NUMBER_OF_SEGMENTS attribute is set to 1. Refer to the Configuring Active Channels (LabWindows/CVI) topic for more information about configuring active channels. Note: The result of this attribute is invalid if you set the NIWLANA_OFDM_DEMOD_COMBINED_SIGNAL_DEMODULATION_ENABLED attribute to NIWLANA_VAL_TRUE. Note: The result of this attribute is invalid if you set the NIWLANA_OFDM_DEMOD_COMBINED_SIGNAL_DEMODULATION_ENABLED attribute to NIWLANA_VAL_TRUE. Note: If the magnitude of the carrier or the Sample clock frequency offset is greater than 25 ppm, I/Q gain imbalance magnitude is greater than 3 dB, and quadrature skew magnitude is greater than 15 degrees, the estimates of these impairments might be inaccurate. Note: If the cable connecting the device under test (DUT) and the NI-RFSA has significant low-pass characteristics or in-band ripple, measuring OFDM I/Q gain imbalance and quadrature skew may be adversely affected. |