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基于卡尔曼滤波提出了两种相干光正交频分复用(CO-OFDM)系统的相位噪声补偿算法,这两种算法在发射端的时域均插入导频,并在接收端对导频进行卡尔曼滤波,最后利用插值算法补全全部子载波的相位噪声。仿真结果表明,基于最小均方误差(MMSE)准则的判决反馈算法在相位噪声比率为10~(-4)时,系统误码率约为10~(-4),并且出现了错误平层,而基于卡尔曼滤波所提出的两种相位噪声算法在大相位噪声的情况下仍然具有较好性能且能有效地降低错误平层,因而所提出的相位噪声补偿算法能改善CO-OFDM系统的性能。
Based on the Kalman filter, the phase noise compensation algorithms of two coherent optical orthogonal frequency division multiplexing (CO-OFDM) systems are proposed. Both of these algorithms insert pilots in the time domain of the transmitting end and perform pilots on the receiving end Kalman filter, and finally use the interpolation algorithm to complete the phase noise of all subcarriers. The simulation results show that the system error rate is about 10 ~ (-4) when the phase noise ratio is 10 ~ (-4) based on the MMSE criterion, and the error leveling layer appears. However, the two phase noise algorithms proposed based on Kalman filter still have good performance in the case of large phase noise and can effectively reduce the error floor, so the proposed phase noise compensation algorithm can improve the performance of the CO-OFDM system .