| Publisher | Institute of Electrical and Electronics Engineers | ||
|---|---|---|---|
| Format | 350.9KB PDF, requires Acrobat Rdr 5 | Date added | 21 Jan 2004 |
| Topics | Modems | ||
| Downloads | 89 | ||
In orthogonal frequency division multiplexing (OFDM) systems, the subcarriers are generated by an inverse discrete Fourier transform. In the literature, the spectra of these subcarriers are often represented by a sequence of sinc functions of the same polarity. This is not consistent with the intercarrier interference (ICI) cancellation properties of polynomial cancellation coding (PCC) or similar self-ICI cancellation schemes in OFDM. This paper shows the spectra of these subcarriers are more accurately represented by a sequence of sinc functions with alternating polarity. It is shown that the spectral rolloff of OFDM signals can be improved by PCC and the resultant OOB power is much reduced.
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