Understanding cross-band interference in unsynchronized spectrum access
Proceedings of the 2009 ACM workshop on Cognitive radio networks
An inter-carrier interference reduction scheme for OFDM underwater acoustic communications
ISCIT'09 Proceedings of the 9th international conference on Communications and information technologies
Interference mitigation in IEEE 802.11G OFDM systems with smart antennas and tapped delay lines
MILCOM'06 Proceedings of the 2006 IEEE conference on Military communications
Pairwise subcarriers weighting for suppressing out-of-band radiation of OFDM
International Journal of Communication Systems
| Hi-index | 0.43 |
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.