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首页> 外文会议>International Conference on Transparent Optical Networks >Pilot tones based polarization rotation, frequency offset and phase estimation for polarization multiplexed Offset-QAM Multi-Subcarrier coherent optical systems
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Pilot tones based polarization rotation, frequency offset and phase estimation for polarization multiplexed Offset-QAM Multi-Subcarrier coherent optical systems

机译：基于导频的偏振旋转，频偏和相位估计，用于偏振复用Offset-QAM多子载波相干光学系统

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摘要

Multi-Subcarrier Offset-Quadrature Amplitude Modulation (OQAM) scheme has recently been proposed to increase the spectral efficiency (SE) of optical coherent communication systems. Thanks to the half symbol delay between the in-phase and quadrature components, OQAM signals can achieve channel spacing values as low as the symbol rate Rs, without suffering from inter channel interference (ICI) even in the condition of severe spectral overlapping. On the other hand, phase noise due to this half symbol delay not only results in the random rotation of the received constellation points but also introduces additional cross talk after equalization, when using standard equalization algorithms. Therefore, OQAM signals have very poor tolerance towards laser linewidth. In addition, for a polarization multiplexed (PM) system, polarization rotation between the x and y polarizations interacting with the phase noise can severely affect the performance. In this paper we propose a pilot tones (PTs) based approach for multi-subcarrier OQAM signals. The PTs are used to estimate frequency offset (FO), carrier phase (CP) and the polarization rotation matrix. An equalizer based on a modified constant modulus algorithm (CMA) is finally used to recover the signal.
机译：最近已经提出了多子载波偏移正交幅度调制（OQAM）方案，以提高光学相干通信系统的频谱效率（SE）。由于同相和正交分量之间的符号延迟为半，即使在严重的频谱重叠情况下，OQAM信号也可以实现低至符号率Rs的信道间隔值，而不会遭受信道间干扰（ICI）。另一方面，当使用标准均衡算法时，由于该半码元延迟而引起的相位噪声不仅会导致接收到的星座点的随机旋转，而且还会在均衡后引入额外的串扰。因此，OQAM信号对激光线宽的耐受性非常差。此外，对于偏振复用（PM）系统，与相位噪声相互作用的x和y偏振之间的偏振旋转会严重影响性能。在本文中，我们为多子载波OQAM信号提出了一种基于导频音（PT）的方法。 PT用于估计频率偏移（FO），载波相位（CP）和极化旋转矩阵。最后使用基于改进的恒定模量算法（CMA）的均衡器恢复信号。

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