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OFDM stands for Orthogonal, Frequency-Division Multiplexing.
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Spectral location of individual OFDM symbols
The generic IFFT OFDM transmitter takes $N$ serial input data symbols, parallelizes them, maps them to their signal constellation points, and processes all $N$ resultant complex values using the IFFT to … Are these two different OFDM implementations, or is the IFFT implemented in a different way to achieve this? …
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OFDM transmitter bandwidth
DAC output
In order to transmit the OFDM signal on a carrier, more samples are required per IFFT output value. … How is OFDM typically implemented to ensure the correct bandwidth; should some subcarriers be set to zero? Should another DAC approach be used? …