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QAM scatter plot with impairments
pulse shape
roll-off factor $\alpha$
constellation size
SNR=$E_s/N_0$ [dB]
$\varphi_{\rm off}$ in degrees
$f_{\rm off}/R_s$
$\varphi_{\rm imb}$ in degrees
$a_{\rm imb}$ Q-scaling
$dc_{\rm imb}$ Q, DC offset
$\times \frac{T_s}{32}$ timing offset
color map
nb QAM symbols
 
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Idle.