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相干光通信系统中判决辅助式最大似然(DAML)相位估计算法因其较高的计算效率引起了广泛的关注.然而,传统DAML相位估计算法假设激光器相位噪声在整个块长度区间内是恒定不变的,这引起了块长度效应.本文考虑了激光器相位噪声缓慢时变的特点,并提出了基于相干光M-PSK系统的弹性DAML相位估计算法来克服传统DAML相位估计算法中存在块长度效应的缺点.该算法在传统DAML算法的基础上引入了加权系数来更准确地进行载波相位恢复.同时,本文推导了该算法的相位估计误差,并用仿真验证了其有效性.仿真结果也表明:弹性DAML算法能消除传统DAML算法的块长度效应,并能放宽相干光M-PSK系统对激光器线宽的要求.
Due to its high computational efficiency, the decision-assisted maximum likelihood (DAML) phase estimation algorithm in coherent optical communication systems has drawn much attention. However, the conventional DAML phase estimation algorithm assumes that the laser phase noise is constant over the entire block length Which leads to the block length effect.This paper considers the characteristics of slow and time-varying laser phase noise and proposes an elastic DAML phase estimation algorithm based on coherent light M-PSK system to overcome the effect of block length in traditional DAML phase estimation algorithm The algorithm introduces the weighting coefficient to the traditional DAML algorithm to carry out carrier phase recovery more accurately.At the same time, this paper deduces the phase estimation error of the algorithm and verifies its effectiveness by simulation.The simulation results also show that: The elastic DAML algorithm can eliminate the block length effect of the traditional DAML algorithm and relax the requirements of the laser linewidth of the coherent light M-PSK system.