OFDM Demod:Results:Impairments:IQ Gain Imbalance:Minimum (dB) Property
- Updated2023-02-21
- 2 minute(s) read
Short Name: OFDM IQ Gain Imbalance Minimum (dB)
Property of niWLANAnalysis
Returns the minimum across iterations of I/Q gain imbalance. 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.
You must use the following active channel string formats to query this property.
| Standard Property Value | Active Channel String Syntax |
|---|---|
| 80211A/G OFDM, 80211J OFDM, 80211P OFDM, 80211G DSSSOFDM | "" (empty string) |
| 80211N MIMOOFDM, 80211AH MIMOOFDM | "channelx" |
| 80211AC MIMOOFDM, 80211AF MIMOOFDM, 80211AX MIMOOFDM | "[segmentx/]channely" ("segment0/" is optional if you set the Number of Segments property to 1) |
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Note The result of this property is invalid if you set the OFDM Combined Signal Demodulation Enabled property to True. |
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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 may be inaccurate. |
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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. |
Remarks
The following table lists the characteristics of this property.
| Datatype |  |
| Permissions | Read Only |
| High-level VIs | N/A |
| Resettable | No |