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Up sampling is when you increase the sample rate of a continuous signal. Modulation is when you, by multiplying with a carrier, shift the base frequency of a signal. But what is up conversion? How is it related with the above mentioned terms?

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Your first sentence is not correct. The terminology of 'sample rate conversion' operations is often misused. I suggest you replace your first sentence with, "Interpolation is when you increase the sample rate of a DISCRETE signal sequence." I'd also replace your second sentence with, "Modulation is when you, by multiplying with a carrier frequency, shift a signal's spectral components up in frequency by a fixed amount." (The term "modulation" is typically used when talking about continuous signals.) As far as I understand the terminology, "up-conversion" is when you shift the spectral components of a discrete sequence up in frequency by a fixed amount. [-Rick Lyons-]

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  • $\begingroup$ In digital communications, modulation is the mapping from bits to symbols (pulse amplitudes). For example, in BPSK modulation one maps a bit 0 to an amplitude $A$, and a bit 1 to an amplitude $-A$. Upconversion means shifting the analog baseband modulated signal up to radio frequency for transmission. $\endgroup$ – MBaz May 12 '15 at 11:40
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    $\begingroup$ Upvoting this answer because it is RICK F'ING LYONS. $\endgroup$ – johnwbyrd May 12 '15 at 18:01

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