Franc wrote:
> My system comprises of a QAM mapping and up-sampling filter, now I need
> to evaluate the PSD of the I/Q data after up-sampling. How do I do that
> in Matlab?
>
> TIA.

You can refer to this link:

http://www.mathworks.com/support/tech-notes/1700/1702.html?BB=1

My system comprises of a QAM mapping and up-sampling filter, now I need 
to evaluate the PSD of the I/Q data after up-sampling. How do I do that 
in Matlab? 

TIA.