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Plotting QAM 16 constellation in Cadence

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KostasRF

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Hi,

I've been experimenting with envelope analysis in Cadence and would like to plot the constellation and EVM for a QAM 16 modulated signal. I used the rectangular 16QAM block from rfLib in my testbench.

In SpecteRF wireless envelope analysis, there is the option of printing the constellation and EVM directly, but the wireless analysis option doesn't apply to my case because I'm not using any of the standard wprobes and wsources for LTE or WiFi. However, the classic envelope results do not give me a constellation option.

I want to be able to print the constellation diagram in Cadence without going through Matlab.
 

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Use skill function in Cadence ViVA.
Simply x-y plot with sampling at appropriate time points.

Regarding EVM, calculate rms error value between output signal and reference signal.
 

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