Equation for Baseband OFDM

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Starry
Starry 2022-8-3
I am simulating OFDM using Matlab.
from a source, i was told the baseband OFDM signal, s(t) is given by equation below, where
N is number of subcarriers
Sk is symbol(for eg QAM symbols)
fn is subcarrier frequency
T is symbol period
However, from another source, I was told s(t) is envelope of baseband OFDM signal instead of the baseband OFDM signal itself. So, now actually s(t) is envelope of baseband OFDM signal or the baseband OFDM signal itself? anybody knows the answer?
Thanks.

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