RF Transmitter Design using IQ Mixer

Hello everyone,

I am trying to design a radio over fiber incorperating IQ Mixer using AWR software i.e VSS. Since I am novice to this software I am facing alot of questions without answers.
I have tried to simulate IQ Mixer with VSS but the plots I created like constalation graph it does not display anything. Where could be the problem? Am I in the right track?

Thanking you in advance,

Ndangio.