Appendix F
OFDM Symbol Formation with an N-Point Inverse Discrete Fourier Transform (IDFT)
Each OFDM symbol starts life as a baseband sampled data complex sequence of length N. The sequence is formed as a sum of scaled sampled data sines and cosines, with periods harmonically related to the sequence length N. All the sinusoids in the composite sequence contain precisely N samples and have an integer number of cycles in the interval of length N. The frequencies of the sinusoids can be 0,±1, ±2, ±3, …, ±(N/2) -1, and N/2 cycles per interval. Since the frequencies of the separate sequences contain an integer number of cycles that are harmonics of the fundamental, their inner products are zero, and hence they are mutually orthogonal. It is theoretically ...
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