Hi Gokul,
In OFDM Modulation Finally, I and Q
generated analog waveforms are converted to real-valued waveforms by mixing with
a RF carrier.
The subcarrier frequencies are integer multiples of 1/Tsymbol, where Tsymbol is the
duration of an OFDM symbol, and in this case the frequency is 1.25 GHz. Since the
initial position defined by the OFDM modulator is 17 (position “Number of IFFT points
/ 2 = 16“ stands for a subcarrier frequency of 0), the initial subcarrier will be allocated
at 1.25 GHz, and the subsequent subcarriers will be at 2.5 GHz, 3.75 GHz, and 5
GHz, respectively. The allocation of subcarriers, can also be
visualized from the “Graphs“ property of OFDM Modulator in project browser, the spectrum of the In-phase signal at the OFDM output as well as the upconverted OFDM signal spectrum.
Thanks