1. The problem statement, all variables and given/known data First of all, I have to calculate power spectral density S(jw) of this signal: It looks something like that: t>=0 2. Relevant equations 3. The attempt at a solution It seems to me, that I can't use this standart formula: So.. I see that there is signal multiplication- exponent and sinus, but still not clear how to get spectral density S(jw). Any ideas?