Finding the Bandwidth of PSK Signal

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To determine the 3 dB bandwidth of a PSK signal with a center frequency of f_{c} and a root raised cosine filter, the challenge lies in the absence of a specific equation to represent the PSK signal. Without a mathematical representation, taking the Fourier transform to analyze the spectrum and extract the bandwidth is not feasible. The discussion highlights the need for a method to derive the signal's equation to facilitate the Fourier transform process. Participants are seeking insights or solutions to overcome this limitation. Addressing this issue is crucial for accurately finding the bandwidth of the PSK signal.
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I've got a signal and I would like to find the 3 dB bandwidth. The signal has a center frequency of f_{c} and a has a bandwidth shaping filter applied to it (ie, a root raised cosine filter).

The problem with finding the bandwidth, is that I have no equation for representing a PSK signal. For this reason, I can't take the Fourier transform to get the spectrum. If I could take the Fourier transform, then I could find the bandwidth, but this seems to be a necessary step that I'm unable to take.
 
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