Apply I/Q Imbalance to 16-QAM Signal in Simulink

The cm_iq_imbalance_16qam model applies I/Q imbalance and DC offset impairments to a set of 16-QAM symbols, and then plots the signal constellation.

Display the signal constellation with zero values applied for all impairments. The signal samples and the reference constellation points align and overlay with each other in the constellation diagram.

Display the signal constellation with amplitude imbalance impairment only. The 16-QAM constellation elongates to a rectangular shape.

The amplitude imbalance is: 3.00 dB.

Display the signal constellation with phase imbalance impairment only. The 16-QAM constellation shifts to a rhombus shape.

The phase imbalance is: 30.00 degrees.

Display the signal constellation with in-phase DC offset impairment only. The 16-QAM constellation translates in the direction of the in-phase DC offset.

The in-phase DC offset is: 1.50.

Display the signal constellation with quadrature DC offset impairment only. The 16-QAM constellation translates in the direction of the quadrature DC offset.

The quadrature DC offset is: 1.50.

Impairments can be applied as negative values. Display the signal constellation with all imbalance impairments set to nonzero negative values.

The amplitude imbalance is: -3.00 dB.
The phase imbalance is: -30.00 degrees.
The in-phase DC offset is: -1.50.
The quadrature DC offset is: -1.50.