I have finished transient simulation on my transmitter, after three days.
I can now load the output waveform in the plot. I hope that I can extract the data and use matlab to get the power spectral density plot.
But everytime I try to load the data into a table, which is supposed to be quite large, the loading takes forever and never gave me the final table.
Is there any way to circumvent this problem and analyze the final spectrum ?
The reason why I've not responded to this sooner (other than being rather busy) is because there simply is not enough information to go on. You didn't say what version of the IC tools or spectre that you're using. You didn't say what the expressions you were using were. You didn't give the ocnPrint statement that you used. You didn't give any information as to how many points there were - quite simply, any response would have to be based on so much guess work, that it would be of little value.
Remember that everyone (including the Cadence folk) on this forum are responding here on a voluntary basis (it's a community forum, rather than a support site), and so the more information you provide, the better your chances of getting a prompt answer.