A novel windowing scheme to suppress spectral sidelobes for OFDMA system
Orthogonal frequency division multiplexing access (OFDMA) inherently suffers from large spectral sidelobes, which will lead to interference between users and can not be ignored. In this paper, in order to suppress spectral sidelobes, we propose a novel windowing scheme. The derivation of the optimum window function is based on the solution of an optimization problem. It aims to minimize in-band-out-of-subband (IBOSB) power radiation. An algorithm named GSSO is designed to approximate the optimum window function. The simulation results show that with a lower roll-off factor (2.5%) the proposed windowing scheme can significantly improve the performance of spectral sidelobes suppression.