Time-Domain OFDM Symbols

A time-domain OFDM symbol is shown by the following equation[^1]
$x_{mi}(t)=\frac{1}{\sqrt{N}}{\sum }_{k=0}^{N-1}{X}_{mik}\exp (j2\pi F(t-T_g)k)$
In all OFDM protocols, the symbols are packaged into groups called slots, frames, or blocks.[^1]

humphreysSignalStructureStarlink2023[^1]