Hardware-Efficient Multi-Format Frequency Offset Estimation for M-QAM Coherent Optical Receivers
Hardware-Efficient Multi-Format Frequency Offset Estimation for M-QAM Coherent Optical Receivers
复制标题
M-QAM 相干光接收机的硬件高效多格式频偏估计
DOI：
10.1109/lpt.2018.2863739
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发表时间：
2018-09
影响因子：
2.6
通讯作者：
Yueying Zhan
中科院分区：
文献类型：
--
作者：
Tao Yang;Chen Shi;Xue Chen;Huan Chen;Xiao Luo;Liqian Wang;Yueying Zhan
在未来的弹性光网络中，硬件高效的多格式频偏估计(FOE)是数字相干接收机(DCRS)在降低功耗和数字信号处理单元体积的同时，降低波长匹配要求的关键。在此，我们提出了一种基于扩展QPSK划分和拟线性逼近技术的低复杂度盲前馈FOE算法。通过在极坐标下的处理，首先定义了一种新的简单的误差函数来测量频率偏移引起的相位偏差，从而可以直接由相位偏差与相应的偏移距离之间的准线性关系来确定稳健的FOE。此外，还引入了一种多时间跨度估计方法，以进一步减轻相位噪声对FOE的影响。4/16/32/正交幅度调制的仿真结果不仅证明了其可行性和通用性，而且复杂度分析表明其硬件复杂度显著降低。在双极化4/16/32-QAM测量中，实验研究了误码率与OSNR性能的关系。所提出的FOE的优越性使其在实用的多格式DCRS中具有很高的应用价值。
In future elastic optical networks, hardware-efficient and multi-format frequency offset estimation (FOE) is critical for digital coherent receivers (DCRs) to alleviate the requirement of wavelength matching while reducing the power consumption as well as the footprint of digital signal processing units. Here, we propose a blind feedforward and low-complexity FOE algorithm based on the techniques of extended QPSK partitioning and quasi-linear approximation. With processing in polar coordinates, a simple novel error function is first defined to measure the phase deviation induced by frequency offset so that robust FOE can be directly determined by the quasi-linear relationship between the phase deviation and the corresponding offset distance. Besides, a multi-timespan estimation method is also introduced to further mitigate the phase noise impact on FOE. Not only the simulation results of 4/16/32/64-quadrature amplitude modulation (QAM) demonstrate its feasibility and versatility, but also the complexity analyses show that hardware complexities are significantly reduced. The bit error rate versus OSNR performance is experimentally investigated in double-polarization 4/16/32-QAM measurements. The superiority of the proposed FOE makes it highly desirable for application in practical multi-format DCRs.
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影响因子：
3.8
作者：
Fei Xiao;Jianing Lu;S. Fu;Chenhui Xie;M. Tang;J. Tian;Deming Liu
通讯作者：
Fei Xiao;Jianing Lu;S. Fu;Chenhui Xie;M. Tang;J. Tian;Deming Liu
影响因子：
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作者：
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影响因子：
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影响因子：
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影响因子：
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作者：
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