Wednesday, May 28, 2008

OFDMA Transmitter and Receiver


In the transmitter, the incoming data stream is mapped to the corresponding signal constellation according to the modulation scheme. The samples of the transmitted OFDM symbol can be obtained by performing an Inverse Fast Fourier Transform (IFFT) operation on the group of data symbols which are to be sent on orthogonal subcarriers. Similarly, the recovery of the data symbols from the orthogonal subcarriers is accomplished by using a Fast Fourier Transform (FFT) operation on the block of received samples.

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