Data-aided linear fitting blind phase estimation method for coherent optical OFDM system

Data-aided linear fitting blind phase estimation method for coherent optical OFDM system
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相干光正交频分复用系统数据辅助线性拟合盲相位估计方法

DOI:
10.1007/s11107-015-0565-4
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发表时间:
2016-04
期刊:
Photon Netw Commun
影响因子:
--
通讯作者:
Zhaohui Li
Zhaohui Li
中科院分区:
其他
文献类型:
--
作者:
Man Pan;Xuebing Zhang;Jianping Li;Zhaohui Li

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本文提出了一种新颖的基于数据辅助线性拟合(DALF-based)的相干光正交频分复用(CO-OFDM)盲相位估计方法。与我们之前在基于导频的盲相位估计方法中所做的工作类似,导频子载波用于传输未知的幅度调制信号,以提高频谱效率。但在基于DALF的方法中,所谓的导频子载波可以减少到只有两个,而传统的基于导频辅助(基于PA)的方法需要几乎四个真实的导频子载波。通过 16-QAM CO-OFDM 仿真对传统的基于 PA 和基于 DALF 的相位估计方法进行了性能比较。结果表明,所提出的基于 DALF 的方法的性能优于传统方法,具有较高的 SE,并且在大容量 CO-OFDM 系统中具有潜力。
In this paper, a novel data-aided linear fitting-based (DALF-based) blind phase estimation method for coherent optical orthogonal frequency-division multiplexing (CO-OFDM) is proposed. Similar to our previous work done in the pilot-based blind phase estimation method, the pilot subcarriers are used to transmit unknown amplitude modulation signals in order to improve spectral efficiency. But the so-called pilot subcarriers can be reduced to only two in the DALF-based method, while the conventional pilot-aided-based (PA-based) method requires almost four real pilot subcarriers. A performance comparison of the conventional PA-based and DALF-based phase estimation methods has been demonstrated through a 16-QAM CO-OFDM simulation. The results show that the performance of the proposed DALF-based method is better than the conventional one with higher SE and has the potential in the large capacity CO-OFDM systems.
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