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为补偿CO-OFDM系统中相位噪声引起的干扰,提出了一种改进的基于线性内插的相位噪声补偿算法。该算法利用共轭导频估计相位噪声的均值,然后通过线性内插获得相位噪声的估计值,最后通过频域补偿来恢复出调制信号。此外针对求幅角的非线性运算中存在的相位周跳的问题,文章提出的修正方法能够有效地改善周跳情况的发生。分析与仿真表明:该算法在不同线宽条件下均能提升一定的SNR增益且算法的复杂度低。
To compensate the interference caused by phase noise in CO-OFDM system, an improved phase noise compensation algorithm based on linear interpolation is proposed. The algorithm estimates the mean of phase noise by conjugate pilot, then obtains the estimated value of phase noise by linear interpolation and finally restores the modulated signal by frequency domain compensation. In addition, in view of the problem of the phase slip in the nonlinear operation of the amplitude-varying angle, the correction method proposed in this paper can effectively improve the occurrence of the cycle slip. The analysis and simulation show that this algorithm can improve the SNR gain and the complexity of the algorithm under different linewidth conditions.