Multisymbol QPSK Partitioning for Improved Frequency Offset Estimation of 16-QAM Signals
Multisymbol QPSK Partitioning for Improved Frequency Offset Estimation of 16-QAM Signals
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DOI：
10.1109/lpt.2014.2359735
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发表时间：
2015
影响因子：
2.6
通讯作者：
Ming Li;Jian Zhao;Lian-Kuan Chen
中科院分区：
文献类型：
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作者：
Ming Li;Jian Zhao;Lian-Kuan Chen
提出并研究了一种广义正交相移键控（QPSK）分割算法，用于相干光16正交幅度调制（QAM）接收机中的载波频偏（CFO）估计。该算法利用了不同时域间隔样本之间的相位差，从而显著提高了估计精度。我们提出了一个计算效率的程序来实现广义CFO估计算法。在一个28-GBd的相干16-QAM系统中，仿真结果和复杂度分析表明，16的时间跨度可以实现性能和复杂度之间的最佳平衡。与传统的QPSK分割算法相比，在最佳时间间隔下，实现CFO估计误差的归一化方差为10-8的复杂度可以降低150倍。
We propose and investigate a generalized quadrature phase-shift keying (QPSK) partitioning algorithm for carrier frequency offset (CFO) estimation in coherent optical 16-quadrature amplitude modulation (QAM) receivers. The algorithm utilizes the phase difference between the samples with different time-domain separations, so that the estimation accuracy can be significantly enhanced. We propose a computationally efficient procedure to implement the generalized CFO estimation algorithm. In a 28-GBd coherent 16-QAM system, simulation results and complexity analysis show that the time span of 16 can realize an optimal balance between performance and complexity. With the optimal time span, the complexity to achieve a normalized variance of 10-8 for the CFO estimation error can be reduced by 150 times compared with the conventional QPSK partitioning algorithm.