Demonstration of a carrier frequency offset estimator for 16-/32-QAM coherent receivers: a hardware perspective.
Demonstration of a carrier frequency offset estimator for 16-/32-QAM coherent receivers: a hardware perspective.
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DOI：
10.1364/oe.26.004853
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发表时间：
2018-02
期刊：
影响因子：
3.8
通讯作者：
Gengchen Liu;Kaiqi Zhang;Rui Zhang;R. Proietti;Hongbo Lu;J. S.;Ben Yoo
中科院分区：
文献类型：
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作者：
Gengchen Liu;Kaiqi Zhang;Rui Zhang;R. Proietti;Hongbo Lu;J. S.;Ben Yoo
针对16-QAM和32-QAM相干光接收机，提出并实现了一种硬件效率高、硬件成本低、估计精度高的频偏估计器(FOE)。所提出的FOE在前馈结构中结合了宽范围粗估计器和窄范围高精度估计器。利用基于现场可编程逻辑阵列(FPGA)的实时相干接收机，对该估计器的性能进行了数值和实验研究。与文献中其他最先进的估计器相比，该方法在保持相同的均方误差(MSE)和光信噪比(OSNR)灵敏度的估计精度的同时，减少了40%以上的硬件使用量。这些结果为开发能够支持采用高级调制格式的大容量相干光通信链路的下一代DSP电路提供了可能。
We propose and implement a hardware-efficient frequency offset estimator (FOE) optimized for 16- and 32-QAM coherent optical receivers with low hardware cost and high estimation accuracy. The proposed FOE combines a wide-range coarse estimator and a narrow-range highly accurate estimator in a feedforward architecture. We numerically and experimentally investigate the performance of the proposed estimator by using a field-programmable-logic-array (FPGA) based real-time coherent receiver. Compared with other state-of-the-art estimators in literature, the proposed method reduces over 40% of hardware utilizations while maintaining the same level of estimation accuracy in terms of mean-squared-error (MSE) and optical signal-to-noise ratio (OSNR) sensitivity. These results enable the development of next generation DSP circuit capable of supporting high capacity coherent optical communication link with advanced modulation formats.