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Joint channel/frequency offset estimation and correction for coherent optical FBMC/OQAM system

机译：相干光纤FBMC / OQAM系统的联合信道/频偏估计和校正

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摘要

In this paper, we focus on analysis of the preamble-based joint estimation for channel and laser-frequency offset (LFO) in coherent optical filter bank multicarrier systems with offset quadrature amplitude modulation (COFBMC/OQAM). In order to reduce the noise impact on the estimation accuracy, we proposed an estimation method based on inter-frame averaging. This method averages the cross-correlation function of real-valued pilots within multiple FBMC frames. The laser-frequency offset is estimated according to the phase of this average. After correcting LFO, the final channel response is also acquired by averaging channel estimation results within multiple frames. The principle of the proposed method is analyzed theoretically, and the preamble structure is thoroughly designed and optimized to suppress the impact of inherent imaginary interference (IMI). The effectiveness of our method is demonstrated numerically using different fiber and LFO values. The obtained results show that the proposed method can improve transmission performance significantly.
机译：在本文中，我们专注于分析基于正交编码的信道和激光频率偏移（LFO）的相干联合估计，该信道在具有偏移正交幅度调制（COFBMC / OQAM）的相干光滤波器组多载波系统中进行。为了减少噪声对估计精度的影响，我们提出了一种基于帧间平均的估计方法。该方法对多个FBMC帧内的实值导频的互相关函数求平均。根据该平均值的相位估计激光频率偏移。在校正LFO之后，还可以通过平均多个帧内的信道估计结果来获取最终的信道响应。从理论上分析了该方法的原理，并对前导码结构进行了充分的设计和优化，以抑制固有虚部干扰（IMI）的影响。通过使用不同的纤维和LFO值，通过数值证明了我们方法的有效性。所得结果表明，该方法可以显着提高传输性能。

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