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为补偿OFDM系统中相位噪声引发的干扰,提出了一种非迭代的利用循环前缀进行线性内插的相位噪声抑制算法。该算法利用循环前缀与OFDM符号中对应采样点间的相关性,将未受符号间干扰(Inter Symbol Interference ISI)的循环前缀应用到对相位噪声的估计中,只需要少量循环前缀即可对原有线性内插算法中的插值点进行了优化,通过增加每个OFDM符号中线性内插的插值点数,使得内插估计出的相位噪声更加贴近实际的相位噪声。仿真分析表明,该算法在相位噪声线宽较小时的误码率曲线更能贴近无相位噪声时的曲线,在相位噪声线宽较大时相比原有的相位噪声内插算法有0.8-1.8d B的增益并能够有效降低错误平层。
To compensate for the phase noise-induced interference in OFDM systems, a non-iterative phase noise suppression algorithm using cyclic prefix for linear interpolation is proposed. The algorithm uses the cyclic prefix and the correlation between the corresponding sampling points in the OFDM symbol to apply the cyclic prefix not inter-symbol interference (Inter Symbol Interference ISI) to the phase noise estimation, and only requires a small number of cyclic prefixes The interpolation points in the linear interpolation algorithm are optimized. By adding the linearly interpolated interpolation points in each OFDM symbol, the phase noise estimated by the interpolation is closer to the actual phase noise. The simulation results show that the BER curve is closer to the curve without phase noise when the phase noise linewidth is smaller. Compared with the original phase noise interpolation algorithm when the phase noise linewidth is larger, the BER is 0.8-1.8 d B gain and can effectively reduce the error leveling.