Low-complexity optical phase noise suppression in CO-OFDM system using recursive principal components elimination.
Low-complexity optical phase noise suppression in CO-OFDM system using recursive principal components elimination.
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DOI：
10.1364/oe.23.024077
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发表时间：
2015-09
期刊：
影响因子：
3.8
通讯作者：
Xiaojian Hong;Xuezhi Hong;Sailing He
中科院分区：
文献类型：
--
作者：
Xiaojian Hong;Xuezhi Hong;Sailing He
针对CO-OFDM系统，提出并推导了一种基于递归主成分消去的低复杂度光相位噪声抑制方法R-PCE。通过频域主成分估计和消去，R-PCE减小了光相位噪声引起的信号失真。由于完全避免了矩阵反演和域变换，与提供类似激光线宽公差的正交基展开算法（L = 3）相比，在R-PCE中，多主成分估计的计算复杂性在q = 3和4时分别大幅降低了约7和5倍。通过蒙特卡罗仿真验证了R-PCE及其决策辅助版本（DA-R-PCE）在QPSK/16QAM CO-OFDM系统中抑制光相位噪声的可行性，验证了仅使用少量主成分q（= 3）的R-PCE比常规算法（包括常见的相位误差补偿算法和线性插值算法）提供更大的激光线宽容限。数值结果表明，在适当的q值下，R-PCE和DA-R-PCE可以达到最佳性能，有利于低复杂度的硬件实现。
A low-complexity optical phase noise suppression approach based on recursive principal components elimination, R-PCE, is proposed and theoretically derived for CO-OFDM systems. Through frequency domain principal components estimation and elimination, signal distortion caused by optical phase noise is mitigated by R-PCE. Since matrix inversion and domain transformation are completely avoided, compared with the case of the orthogonal basis expansion algorithm (L = 3) that offers a similar laser linewidth tolerance, the computational complexities of multiple principal components estimation are drastically reduced in the R-PCE by factors of about 7 and 5 for q = 3 and 4, respectively. The feasibility of optical phase noise suppression with the R-PCE and its decision-aided version (DA-R-PCE) in the QPSK/16QAM CO-OFDM system are demonstrated by Monte-Carlo simulations, which verify that R-PCE with only a few number of principal components q ( = 3) provides a significantly larger laser linewidth tolerance than conventional algorithms, including the common phase error compensation algorithm and linear interpolation algorithm. Numerical results show that the optimal performance of R-PCE and DA-R-PCE can be achieved with a moderate q, which is beneficial for low-complexity hardware implementation.