Advances in Signal Processing Vol. 2(1), pp. 1 - 7
DOI: 10.13189/asp.2014.020101
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Out-of-Band Emission Reduction Technique for OFDM and MC-CDMA Systems


Igor Gepko *
UkrainianState Centre of Radio Frequencies,Kiev, Ukraine

ABSTRACT

In this paper, we introduce a method for out-of-band power reduction of multicarrier communication systems. Recent years MC systems possess a dominated role in wireless access due to ability to achieve high data rates and simultaneously high robustness to multipath and fading. Despite all advantages, MC transmission produces an essential out-of-band interference. The OOB radiation leads to the wastage of scarce spectral resources and severe threats to adjacent wireless channels. We propose a novel technique for reducing OOB radiations in OFDM and MC-CDMA systems. To reduce the OOB emissions in the MC-CDMA system, we propose analytical criterion for spectrum efficiency estimation as far as low complexity algebraic algorithm for the proper waveform selection. The structure of selected waveform provides suppression for radiation outside the signal necessary bandwidth. Being implemented in the OFDM system, proposed algorithm is used for calculation of phases of cancellation carriers suppressing most powerful OOB sidelobesin transmitted signal. In the final part of document we consider primer of the simple precoding procedure for OFDM systems which by 10 dB or more reduces the OOB power at the cost of inessential decrease of the information data rate.

KEYWORDS
Out-Of-Band Emission, Interference Cancellation, Spectrum Efficiency, Sidelobe Suppression, MC-CDMA, OFDM

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Igor Gepko , "Out-of-Band Emission Reduction Technique for OFDM and MC-CDMA Systems," Advances in Signal Processing, Vol. 2, No. 1, pp. 1 - 7, 2014. DOI: 10.13189/asp.2014.020101.

(b). APA Format:
Igor Gepko (2014). Out-of-Band Emission Reduction Technique for OFDM and MC-CDMA Systems. Advances in Signal Processing, 2(1), 1 - 7. DOI: 10.13189/asp.2014.020101.