multiplying the received signal by carrier, in OFDM system`

Sorry for this question, I'm still new in signal processing area.
In OFDM system, let
x
be the received signal, what do we call the process of multiplying the received signal
x
by
e
−j2π
F
c
t
, where
F
c
is frequency carrier and
t
is interval 0 : sampling rate: sampling rate * length of signal.
So the question, what is that function? and why do we use it.

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