Sidelobe suppression in NC-OFDM systems using constellation adjustment

Authors:
Dong Li;Xianhua Dai;Han Zhang
Affiliations:
Department of Electrical and Communication Engineering, Sun Yat-Sen University, Guangzhou, P.R.China;Department of Electrical and Communication Engineering, Sun Yat-Sen University, Guangzhou, P.R.China;Department of Electrical and Communication Engineering, Sun Yat-Sen University, Guangzhou, P.R.China
Venue:
IEEE Communications Letters
Year:
2009

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Computers and Electrical Engineering

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Abstract

In this letter, a new method for sidelobe suppression in non-contiguous orthogonal frequency division multiplexing (NC-OFDM) systems is proposed. Unlike the conventional approach, sidelobes are suppressed by iteratively adjusting the constellation points for the subcarriers that are close to the edges of the used bandwidth. The constellation points corresponding to the maximum sidelobe suppression are chosen for transmission. Simulation results show that the proposed algorithm yields good performance improvement in terms of sidelobe suppression, and does not have a significant impact on the peak-to-average power ratio (PAPR).