If yes, there wouldn't be any need to study about this FSK , PSK etc techniques.
FSK, PSK, ASK, QAM, all *are* analog modulation techniques used to transmit digital information. Yes is the answer, then. Over very long distances, or short ones, you need to investigate the limitations imposed by Shannon's equation.
In short, Shannon's equation gives you the best possible digital capacity of a channel, given the bandwidth of the RF channel and the signal to noise ratio. Shannon's equation doesn't care about the modulation you might choose or the error correction codes. It just gives the max NET theoretical capacity of that RF channel (e.g. any error correction code will reduce the net capacity).
To explain a little more, in essence FSK is a form of analog FM. ASK is a form of analog AM. QAM is a combination of analog PM and analog AM. In every example, you are merely mapping an analog amplitude with respect to carrier, phase with respect to carrier, frequency with respect to carrier, or combination of these, to a given digital bit sequence.
The channel bandwidth limits the transfer of theoretically infinite bandwidth of digital signals. Therefore first the digital signals are given appropriate shape with finite BW by filters and then modulated over carriers.
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