Theory

TheoryOFDMOrthogonal Frequency Division MultiplexingFrequency DivisionSplit a wide frequency band into many small frequencies and carry data onto each of these subcarriersMultiplexingAll the data on each of these subcarriers are transmitted simultaneouslyOrthogonalSpacing between carrier signal

SISO OFDM

Inverse Fast Fourier Transform (IFFT) create parallel subcarriersCyclic Prefix avoid ISI due to channel delay spread