在相干光通信系统中, 激光器相位噪声导致信号在复平面发生旋转, 因此在接收端需要对信号进行载波相位估计和恢复。文中主要对当前载波相位估计算法特性进行比较研究。介绍了两种经典算法Viterbi&Viterbi算法和盲相位搜索(BPS)算法的基本原理, 总结了六种二阶级联相位噪声估计算法。比较八种载波相位估计算法的硬件复杂度及线宽容忍度, 并评估了这八种载波相位估计算法在16QAM系统中的性能。

In coherent optical communication systems, the laser phase noise causes the signal to rotate in the complex plane, so the signal carrier phase estimation and recovery are needed in the receiver. The characteristics of current carrier phase estimation algorithms are compared and researched. The basic principles of two classical algorithms Viterbi&Viterbi and blind phase search(BPS) are introduced, and six phase noise estimation algorithms with two-stages are summarized. The hardware complexity and line width tolerance of the eight carrier phase estimation algorithms are compared, and their performances in 16 QAM system are also evaluated.